taxonID	type	description	language	source
9F2B0602AF0DFFF672DAB641298F97AC.taxon	diagnosis	Diagnosis of the genus: “ pseudorostrum projecting anteriorly, slightly shorter in male; antenna 1 geniculate between peduncle articles 1 and 2; antenna 2 of mature male unknown but in immature male brush of seta seen developing on anterior margin of peduncle articles 4 and 5; antenna 2 flagellum elongate in immature male; female with exopods on pereiopods 1 – 3; male with exopods on pereiopods 1 – 4; pereiopod 2 article 3 very short; uropod endopod distinctly 2 - articulate; subadult male with (?) 0 or 1 pair of pleopods ” (Watling, 1991).	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF0DFFF072DAB70529379451.taxon	description	(Figures 1 to 4) Material Holotype ovigerous female (Figure 1), ZMH- K 64943; (16 July 2009); SW Atlantic, Argentine Basin, FS “ Meteor ” cruise Me 79 / 1, station # 534: 36 ° 00.61 ' S 49 ° 01.54 ' W, 4608 m depth, gear: EBS. Paratypes Argentine Basin # 532 — EBS: 1 cephalothorax (ZMH K 64965). # 533 — EBS: 1 non-ovigerous female, 1 ovigerous female (ZMH K 64966), 1 non-ovigerous female, dissected, figured (ZMH K 64944). # 534 — EBS: 1 non-ovigerous female (ZMH K 64967). Brazil Basin # 554 — EBS: 5 non-ovigerous females, 2 mancae (ZMH K 64968). # 561 — EBS: 1 ovigerous female (uropods missing), 5 non-ovigerous females, 1 manca (ZMH K 64969). # 604 — EBS: 1 juvenile male (ZMH K 65768). # 605 — EBS: 1 ovigerous female (uropods missing), 1 non-ovigerous female, 1 manca (ZMH K 64970). Etymology. — The new species is named ” paucidentatis “ referring to the few (lat.: paucus) teeth (lat.: dentis) on the basal article of the exopods on the maxilliped 3 and pereiopod 1. Diagnosis. — Accessory flagellum of first antenna equal in length to basal article of main flagellum; uropod exopod equal in length to endopod; uropod peduncle shorter than endopod basal article; one tooth on basal article of maxilliped 3 exopod. Description. — Based on holotype (Fig. 1), ovigerous female (3.7 mm long) (ZMH- K 64943). Carapace slightly longer than free thoracic segments, serrate to hind margin with 12 dorsomedian teeth, with a small gap before last 3 teeth; pseudorostral lobes 0.2 of total carapace length, with 3 teeth below pseudorostrum; siphonal tube little protruding; ocular lobe rudimentary; eye lenses missing. Antennal notch wide, 47 ° opening angle between dorsal edge of pseudorostrum and dorsal edge of subrostral tooth; anterolateral tooth strong; ventral margin of carapace serrate; integument smooth, whitish. Five free thoracic segments visible. Pleon slightly longer than carapace and thoracic segments combined; pleotelson as long as wide. Appendages: non-ovigerous female, 4.2 mm long (paratype, ZMH K 64944). Antenna 1 (Fig. 2, A 1): relative length of peduncle articles 1 to 3: 41 / 27 / 33; basal article with 1 plumose seta, second article with 1 simple and 3 plumose setae; third article with one plumose and 1 simple setae; accessory flagellum as long as basal article of main flagellum with 4 simple setae (1 lateral, 3 distal); main flagellum 3 - articulated, with a simple seta distally on articles 1 and 2; article 3 with 4 aesthetascs (not figured). Maxilliped 2 (Fig. 2, Mxp 2): B / R ratio 0.6, relative length of articles I to D: 14 / 29 / 28 / 18 / 11; basis with long plumose seta; ischium unarmed; merus with fringe of hair-like setae along outer margin, strong plumose seta on distal margin; carpus with 3 barely setulate setae along inner margin; propodus with 4 barely setulate setae along inner margin; one strong plumose seta on outer margin; dactylus with one strong simple terminal seta (unguis) and 4 slender simple setae subterminally. Maxilliped 3 (Fig. 2, Mxp 3): B / R ratio 0.8, relative length of articles I to D: 9 / 22 / 32 / 18 / 18; basis with 5 plumose setae along inner margin and 3 strong plumose setae on outer distal corner; ischium unarmed; merus with slender plumose seta on inner margin, strong plumose seta on outer distal corner; carpus with tooth distally, 3 simple setae along inner margin, one plumose seta on outer distal corner; propodus with 3 barely setulate setae along inner margin, one plumose seta on outer distal corner; dactylus one simple seta terminally, one plumose seta and 3 simple setae sub terminally, 3 simple setae along inner margin, one simple seta on outer margin; exopod present, basal article with one tooth. Pereiopod 1 (Fig. 2, P 1): broken after ischium; basis with 8 plumose setae, no teeth; exopod, basal article with 2 teeth. Pereiopod 2 (Fig. 3, P 2): B / R ratio 0.8, relative length of articles I to D: 5 / 23 / 27 / 13 / 33; basis with 4 plumose setae; ischium unarmed; merus with 3 plumose setae; carpus with 2 plumose setae and one simple seta; propodus with one simple seta distally; dactylus with one terminal seta and 3 plumose setae sub terminally, 3 plumose setae along outer margin; exopod present. Pereiopod 3 (Fig. 3, P 3): B / R ratio 1.4, relative length of articles I to D: 19 / 24 / 35 / 17 / 5; basis with 7 plumose setae; ischium with 2 plumose setae; merus with 2 plumose setae and one simple seta; carpus with one slender and 2 strong plumose setae, one strong simple seta; propodus with one strong simple seta; dactylus with one strong simple seta terminally one plumose seta sub terminally; exopod present. Pereiopod 4 (Fig. 3. P 4): B / R ratio 1.1, relative length of articles I to D: 18 / 24 / 33 / 16 / 9; basis with 6 plumose setae; ischium with one simple seta and 2 plumose setae; merus with one plumose seta; carpus with 2 plumose setae along inner margin, 3 simple setae on outer distal corner; propodus with one strong simple seta on outer distal corner; dactylus with one strong simple seta terminally and a slender simple seta sub terminally. Pereiopod 5 (Fig. 4, P 5): B / R ratio 0.9, relative length of articles I to D: 16 / 24 / 34 / 20 / 6; basis with 6 plumose setae; ischium with 2 plumose setae; merus with one plumose seta; carpus with 4 plumose setae; propodus with one simple seta distally; dactylus with one strong simple seta terminally and a slender seta sub terminally. Uropods (Fig. 4, U), peduncle with 3 cuspidate setae along inner margin, 1.5 times longer than pleotelson, 0.9 times shorter than basal article of endopod. Exopod equal in length to endopod; endopod 2 articulated; basal article with 3 cuspidate setae along inner margin, 2.6 times as long as second article which bears 3 cuspidate setae along inner margin and a strong terminal simple seta. The juvenile male (ZMH K 65768) has no pleopods buds but all 5 pairs of pereiopods. Distribution: SW Atlantic, Argentine and Brazil Basins, 4484 – 5188 m. Remarks: The comparison with the known Bytholeucon species (Table 2) reveals that the discriminant characters are quite subtle. In fact, the divisions between species are due to the differing combinations of characters rather than to striking morphological features. According to Table 2 the new species is close to B. kaingo Mühlenhardt-Siegel, 2010 and B. hartmannorum Mühlenhardt-Siegel, 2011 because of the accessory flagellum of the first antenna being equal in length to the basal article of the main flagellum. The uropod exopod is equal in length to the endopod as in B. hartmannorum but in B. kaingo the exopod is longer than the endopod. In the new species the uropod peduncle is shorter than the endopod basal article (as in B. kaingo) but it is longer in B. hartmannorum. The number of teeth on the basal article of the maxilliped 3 exopod is one in the B. paucidentatis sp. nov. but more (3 to 6) in the other species. Also the number of teeth on the exopods basal article of pereiopod 2 is lower (2 teeth) in the new species than in the other known species (3 to 6). The number of teeth on the basis of P 1 appears to be variable, it is 0 in preadult females but 3 in ovigerous female (ZMH K 64966). Also variable is the number of teeth along the dorsomediane line. It is 8 to 10 before the gap and 3 to 4 behind the gap in non-ovigerous females, 13 to 17 without a gap in ovigerous females or females with developing oostegites, mancae have less teeth on the dorsomediane line but they do have a gap. Bishop (1981) recorded Paraleucon? hiscens from the Argentine Basin, 5208 – 5223 m. This species was transferred to the genus Bytholeucon by Watling (1991). The differences between B. hiscens and the new species are in the length proportion of the accessory flagellum to the basal article of the main flagellum of the antenna 1, it is longer in B. hiscens but equal in length in the new species; the number of teeth on the basal article of the exopods of the maxilliped 3 are 3 to 4 in B. hiscens (1 in B. paucidentatus sp. nov.), these teeth on the exopods of pereiopod 1 are 3 to 6 in B. hiscens (2 in B. paucidentatus sp. nov.), the number of dorsomedian teeth of the carapace in female are 14 in B. hiscens (variable in B. paucidentatus sp. nov.), the uropods endopod is longer than the exopod in B. hiscens (equal in length in B. paucidentatus sp. nov.) (tab. 2).	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF0BFFFF72DAB5182B7592A4.taxon	diagnosis	Diagnosis: Pseudorostrum directed dorsally in both male and female; antenna 1 geniculate between peduncle article 2 and 3; male antenna 2 with brush of setae on anterior margin of peduncle articles 4 and 5; male antenna 2 flagellum extending nearly to end of pleon; female with exopods on pereiopods 1 – 3; male with exopods on pereiopods 1 – 4; pereiopod 2 article 3 lost; uropod endopod 2 articulate; male with 2 pairs of pleopods. (Watling, 1991). Remarks: The most important characters for discriminating the species of the genus Eudorella are, according to Barnard & Given (1961): style of serration along the anterior carapace margin; articulation of the apical seta of the uropod endopod if it is fused or articulate; length relation between the uropod endopod and exopod; form and / or serrations of anterior sinus of carapace (antennal notch). According to Watling (1991) and not mentioned in Barnard & Given (1961), important characters are: A 1, accessory flagellum length and width compared with main flagellum; length proportion between peduncle articles 2 and 3; pereiopod 2 article 5 relative length to article 4; presence or absence of a long plumose seta on peduncle distal end.	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF04FFFA72DAB00C2B079454.taxon	description	(Figures 5 – 8) Material: Holotype: 1 non-ovigerous female (ZMH K 64945) (15 July 2009); SW Atlantic, Argentine Basin, FS “ Meteor ” cruise Me 79 / 1, station # 533, 36 ° 00.20 ' S 49 ° 01.96 ' W, 4602 m depth; gear: EBS. Paratypes: Argentine Basin: # 533 — EBS: 1 subadult male with developing pleopods (5.2 mm long, dissected, ZMH K 64946). # 533 — EBS: 1 non-ovigerous female, damaged (ZMH K 64971). # 534 — EBS: 1 juvenile male (no dorsal tooth), 1 adult male, pleon missing (pleonite 3 and onwards) (ZMH K 64972). Brazil Basin: # 604 — EBS: 1 non-ovigerous female (front part damaged) (ZMH K 64973). # 609 — EBS: 1 manca (ZMH K 64974). Etymology. — The new species is named “ paramonodon ” because of its similar appearance to E. monodon Calman, 1912. Diagnosis. — Anterior margin of carapace with tooth formula: 7 up, 0 down (above antennal notch), 2 down (below antennal notch); second article of the A 1 peduncle not dilated. Description. — Based on holotype (Figure 5), non-ovigerous female, 5.3 mm long (ZMH K 64945). Carapace little shorter (0.9 times) than free thoracic segments, with a single tooth middorsally immediately behind frontal lobe; pseudorostral lobes short, directed upwards; siphonal tube not protruding; ocular lobe reduced, eye lenses missing. Antennal notch small, anterolateral tooth not pronounced; anterior margin of carapace with tooth formula: 6 up, 0 down (above antennal notch), 2 down (below antennal notch); anteroventral margin serrate (Figure 8); integument whitish. Five free thoracic segments visible, the first smallest. Pleon 1.3 times longer than carapace plus free thoracic segments. Pleotelson 1.4 times longer than wide. Appendages: subadult male, paratype, 5.2 mm long (ZMH K 64946). Antenna 1 (Fig. 6, A 1): relative length of peduncle articles 1 to 3 not given, article 1 broken during dissection, article 2 about as long as article 3; accessory flagellum 0.8 times as long as basal article of main flagellum, with 3 simple setae terminally; main flagellum 3 - articulated. Antenna 2 (Fig. 6, A 2) Maxilliped 2 (Fig. 6, Mxp 2): B / R ratio 0.4, relative length of articles I to D: 10 / 32 / 26 / 21 / 11; basis with 2 pappose setae; ischium unarmed; merus with one plumose seta; carpus with 3 plumose setae and 8 simple setae; propodus with one long plumose seta and 11 simple setae; dactylus with one terminal and 3 sub terminal simple setae. Maxilliped 3 (Fig. 6, Mxp 3): B / R ratio 0.9, relative length of articles I to D: 7 / 21 / 31 / 19 / 21; basis distally widened, with 3 long plumose setae on extension; ischium with one pappose seta; merus with one long pappose seta on outer distal edge, 3 pappose setae along inner margin; carpus with 8 pappose setae along inner margin; propodus with 4 pappose setae on distal margin; dactylus with one terminal and 4 sub terminal simple setae, one pappose seta subterminally; exopod present. Pereiopod 1 (Fig. 6, P 1): B / R ratio 0.7, relative length of articles I to D: 11 / 18 / 24 / 28 / 19; basis with 8 teeth along inner margin, 7 pappose setae, one simple seta on inner distal corner, 2 pappose setae on outer distal edge; ischium with one simple seta; merus with 2 simple setae, one pappose seta; carpus with 4 simple setae; propodus with 7 simple setae; dactylus with one terminal simple seta, 5 simple setae along inner margin, 3 short simple setae on outer margin; exopod present. Pereiopod 2 (Fig. 6, P 2): B / R ratio 1, relative length of articles I to D: 0 / 28 / 33 / 13 / 25; basis with 4 pappose and 2 simple setae; ischium fused to basis; merus with one pappose seta, 2 short simple setae; carpus with one simple seta; propodus unarmed; dactylus with 9 simple setae; exopod present. Pereiopod 3 (Fig. 7, P 3): B / R ratio 1.7, relative length of articles I to D: 15 / 28 / 28 / 20 / 9; basis with 6 simple setae, one pappose seta on distal margin; ischium with one pappose seta; merus with one simple and one pappose seta; carpus with 3 simple setae; propodus with one simple seta on outer distal corner; dactylus with one strong simple seta terminally; exopod present. Pereiopod 4 (Fig. 7, P 4): B / R ratio 1.8, relative length of articles I to D: 18 / 29 / 24 / 22 / 7; basis with 5 simple setae; ischium unarmed; merus with one pappose and one simple seta; carpus with one simple seta and 2 pappose setae; propodus with 2 simple setae; dactylus with 2 simple seta terminally, exopod present. Pereiopod 5 (Fig. 7, P 5): B / R ratio not given, basis damaged during dissection, relative length of articles I to D: 21 / 21 / 29 / 21 / 7; basis, ischium and merus unarmed; carpus with one pappose seta, 3 simple setae on distal margin; propodus unarmed; dactylus with one strong terminal seta. Uropods (Fig. 7 U), peduncle 0.9 times as long as pleonite 6, subequal in length to basal article of endopod; exopod slightly shorter than endopod; endopod 2 articulated, basal article 3.4 times longer than second article, with 8 (one broken in the present specimen) cuspidate setae along inner margin; second article with 3 cuspidate setae along inner margin, one simple seta terminally. Distribution: Argentine and Brazil Basin, 4601 to 5180 m. Remarks: The specimens assigned here to Eudorella paramonodon sp. nov. are in poor condition, but the arrangements of the teeth on the anterior margin of the carapace indicates that they all belong to the same species (Fig. 8). There is only one known Eudorella species with a mediodorsal tooth on the carapace behind the exhalant hole, E. monodon Calman, 1912 from the Gulf of Mexico. Calman (1912) stated for this species “ Anterior margin most nearly resembling that of E. hirsuta Sars, but the antero-lateral tooth is more prominent and the serrations on the upper part of the margin (anterior margin of the pseudorostral plate) point downward. Among the present specimens is only one undamaged non-ovigerous female, the holotype, with a dorsal anteriorly curved tooth as in E. monodon, but the antero-lateral serration (Figure 8) is different: in E. monodon the more dorsal 4 spines are directing downward, in the present specimens they are pointing forward. In E. monodon the second article of the A 1 peduncle is dilated, in the present specimens it is not. There is 1 species, Eudorella helenae Brito & Serejo, 2023, from the Brazil Basin (25 – 392 m depth), which is not conspecific with the new species because the terminal seta of the uropod endopod is fused to the last article, in the new species it is articulated, and the middorsal tooth on the carapace is located before the frontal fissure in E. helenae, but it is located behind the frontal lobe fissure in the new species. In both species, E. paramonodon sp. nov. and E. monodon, the middorsal tooth is located at one-third of the carapace just behind the frontal lobe, whereas in E. truncatula and E. helenae this tooth is contiguous to the respiratory opening.	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF01FFF972DAB51C2A9E93A8.taxon	diagnosis	Diagnosis of the genus: “ pseudorostrum directed dorsally in both male and female; antenna 1 geniculate between peduncle articles 1 and 2; male antenna 2 with brush of setae on anterior margin of peduncle articles 4 and 5; male antenna 2 flagellum extending well along pleon; female with exopods on pereiopods 1 – 3; male with exopods on pereiopods 1 – 4; pereiopod 2 article 3 lost; uropod endopod 2 - articulate; male with 2 pairs of pleopods ” (Watling, 1991).	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF02FFE472DAB30028A9941C.taxon	description	(Figures 9 – 12) Material: Holotype: ovigerous female (ZMH K 64947) (15 July 2009), SW Atlantic, Argentine Basin, FS “ Meteor ” cruise Me 79 / 1, station: # 533, 36 ° 00.20 ' S 49 ° 01.96 ' W, 4602 m depth; gear: EBS. Paratypes: Argentine Basin: # 532 — EBS: 1 manca, 1 ovigerous female; 1 juvenile male (pleopods not yet developed) (ZMH K 64975), 1 ovigerous female (5.3 mm long, dissected, ZMH K 64948), # 533 — EBS: 11 mancae, 7 preparatory females (1 broken after pereionite 4, 1 broken after pleonite 2), 3 ovigerous females, 1 subadult male (developing pleopods) (ZMH K 64976); 1 adult male (figured, ZMH K 64949); # 534 — EBS: 9 mancae, 6 preparatory females (1 figured), 2 ovigerous females, 2 adult males (one of them broken after carapace), 2 adult males (1 dryed) (ZMH K 64977). Etymology. — The new species is named “ dentata ” because of the dentate dorsomediane and lateral ridges and the anterior margin of the carapace. Diagnosis. — Dorsomedian line of carapace with 9 teeth, the anteriormost largest; laterally a serrate ridge running from anterior part to at least hind quarter of the carapace; some females can carry not only one but 2 weak lateral folds with teeth; uropod endopod sub equal in length to exopod. Description. — Based on holotype (Fig. 9), ovigerous female, 5.1 mm long ZMH: K 64947 Carapace as long as free thoracic segments, dorsomedian line with 9 teeth, the first biggest, followed by 1 or 2 (in paratype ZMH K 64948) in a single row and 3 pairs of dorsomedian teeth; laterally a serrate ridge running from anterior margin to at least hind quarter; pseudorostral lobes directed upwards; siphonal tube short, not protruding; ocular lobe rudimentary; eye lenses missing. Antennal notch in anterior ventral corner; anterolateral tooth not developed; anterior and ventral margin of carapace strongly serrate; integument with scaly structure. Five free thoracic segments visible, dorsal teeth at pereionite segments 1 – 4. Pleon 1.1 times longer than carapace plus free thoracic segments. Pleotelson 1.3 times longer than wide, little protruding between uropods, anal valves visible in dorsal view. Appendages: ovigerous female, 5.3 mm long (paratype ZMH: K 64948) Antenna 1 (Fig. 10, A 1): relative length of peduncle articles 1 to 3: 59 / 24 / 17; geniculated between peduncle articles 1 and 2; basal article with 3 plumose setae, second article with 3 plumose and 2 simple setae, third article with one slender simple seta, 2 slender plumose setae on inner distal edge, 5 plumose setae along outer distal margin; accessory flagellum longer than basal article of main flagellum, with 3 long simple setae; main flagellum 3 - articulated, basal article with 3 long simple setae, second article with 2 simple setae, third article with 3 simple setae. Maxilliped 2 (Fig. 10, Mxp 2): B / R ratio 0.5, relative length of articles I to D: 8 / 29 / 29 / 22 / 13; basis with one strong plumose seta; ischium and merus unarmed; carpus with 11 plumose setae; propodus with one strong plumose seta on outer margin and 8 simple setae on inner margin; dactylus with 1 stronger terminal seta and 6 sub terminal simple setae; 5 strong setae on rudimentary oostegite. Maxilliped 3 (Fig. 10, Mxp 3): B / R ratio 1.1, relative length of articles I to D: 13 / 20 / 32 / 18 / 17; basis with 3 plumose setae on inner margin and 4 plumose setae on outer distal corner; ischium with 3 simple setae; merus with one plumose seta and 2 simple setae; carpus one simple seta and 2 plumose setae; propodus with 1 simple and 3 plumose setae on; dactylus with one simple terminally and 2 simple setae sub terminally; exopod present. Pereiopod 1 (Fig. 10, P 1): B / R ratio and relative length of articles I to D not given, extremity broken after basis. Pereiopod 2 (Fig. 10, P 2): B / R ratio 0.9, relative length of articles I to D: 3 / 23 / 25 / 17 / 31; basis with 5 plumose and 2 simple setae; ischium unarmed; merus with 3 plumose setae; carpus with one plumose and 2 simple setae; propodus unarmed; dactylus with one terminal, 2 sub terminal and 2 lateral simple setae; exopod present. Pereiopod 3 (Fig. 11, P 3): B / R ratio 1.6, relative length of articles I to D: 15 / 25 / 38 / 18 / 5; basis with 3 plumose setae; ischium with 3 simple setae; merus with one simple and one plumose setae; carpus with one simple seta and 2 plumose setae; propodus with 2 simple setae distally; dactylus with one terminal simple seta and 2 simple setae sub terminally; exopod present. Pereiopod 4 (Fig. 11, P 4): B / R ratio 1.0, relative length of articles I to D: 14 / 25 / 39 / 17 / 6; basis with 3 plumose setae; ischium with one plumose seta and 2 simple setae; merus with one plumose seta; carpus with one plumose seta and distally 2 simple setae; propodus with 3 simple setae; dactylus with one strong simple seta terminally. Pereiopod 5 (Fig. 11, P 5): B / R ratio not given, basis damaged, relative length of articles I to D: 15 / 25 / 35 / 18 / 7; basis with 2 simple and 3 plumose setae; ischium with 2 strong simple setae; merus with one simple seta; carpus with one plumose seta and 2 strong simple setae; propodus with one strong simple seta; dactylus with one strong simple seta terminally. Uropods (Fig. 11, U), peduncle 1.2 times as long as pleotelson, 0.8 times as long as endopod, with 4 cuspidate setae along inner margin; exopod equal in length to endopod; endopod 2 - articulated, basal article 1.4 times as long as distal article, with 4 cuspidate setae along inner margin; distal article with 4 cuspidate setae along inner margin, one terminal simple seta. Male: adult male (ZMH K 64949), (Fig. 12) with pseudorostrum much shorter than in female and subadult male; teeth on dorsomedian line of carapace reduced; A 2 flagellum not reaching pleon, peduncle with brush of setae along upper margin. Subadult male with 9 teeth along anterior margin of carapace, antennal notch absent; ventral margin finely serrate; dorsomediane line of carapace with 7 small teeth (irregularly arranged), pereionites 1 – 3 with dorsal teeth. Distribution: Argentine Basin, 4602 – 4608 m. Remarks: Nine species are known so far from the genus Eudorellopsis:	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF02FFE472DAB30028A9941C.taxon	description	The new species is the first described for the southwestern Atlantic. The adult females in the new species have 7 – 9 teeth along the anterior margin of the carapace; the females can carry 1 – 2 weak lateral folds with teeth (Figure 9 c) running horizontally; there is only one species in this genus, E. biplicata Calman, 1912, with 2 lateral folds on the carapace, but in E. biplicata the folds run more vertically. The short pseudorostrum in adult males is comparable to the pseudorostrum described for E. deformis. The specimens belong to a new species because of 2 characters unique in the genus, 2 horizontal lateral serrated folds on carapace and 2 plus 3 pairs of mediodorsal teeth on carapace. In addition, the endopod is subequal in length to the exopod, when usually the endopod is shorter.	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF18FFE372DAB3912EE69130.taxon	diagnosis	Diagnosis of the subgenus: “ Branchial siphon normal; accessory flagellum of antenna 1 rudimentary; pereionite 5 without ventral teeth; uropod endopod terminal seta fused to distal article ” (Watling, 1991).	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF18FFE372DAB2DD2B3192D8.taxon	diagnosis	Diagnosis of the genus: “ Pseudorostrum projecting anteriorly, usually slightly shorter in male; antenna 1 not geniculate; male antenna 2 with brush of setae on anterior margin of peduncle articles 4 and 5; male antenna 2 flagellum extending well along pleon; female with exopods on pereiopods 1 – 3; male with exopods on pereiopods 1 – 4; pereiopod 2 article 3 very short or lacking; uropod endopod 2 - articulate; male with 2 pairs of pleopods ” (Watling, 1991).	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF18FFED72DAB0F92BD896B4.taxon	description	(Figures 13 – 16) Material: Holotype: ovigerous female (ZMH K 64950) (15 July 2009); SW Atlantic, Argentine Basin, station # 533, 36 ° 00.20 ' S 49 ° 01.96 ' W; 4602 m depth; gear: EBS. Paratypes: Argentine Basin: # 532 — EBS: 1 adult male (was dried), 53 subadult males, 1 male carapace, 61 non-ovigerous females, 9 preparatory females, 7 ovigerous females, 19 mancae, 9 damaged / carapaces only (ZMH K 64978). # 533 — EBS: 3 adult males (1 figured, 1 with pleon missing after pleonite 3), 61 subadult males, 94 ovigerous females (1 figured, 1 dissected, ZMH K 64951), 412 non-ovigerous females, 111 mancae / juveniles, 18 carapaces only (ZMH K 64979). # 534 — EBS: 1 adult male (ZMH K 64952, special vial), 100 subadult males, 320 ovigerous females, 314 non-ovigerous females, 22 juveniles, 30 mancae, 149 carapaces only / badly damaged specimens (ZMH K 64980). Etymology. — The new species is named after the locality of distribution, the Argentine Basin. Diagnosis. — Carapace dorsomedian line serrate (17 teeth) to the hind margin; A 1 rather stout, peduncle articles almost equal in length; antennal notch with small extra tooth in sinus, sinus reaching beyond level of frontal lobe anterior margin. Description. — Based on holotype, ovigerous female (Fig. 13), 4.7 mm long (ZMH K 64950). Carapace 1.2 times longer than free thoracic segments; dorsomedian line serrate (17 teeth) up to hind margin; pseudorostral lobes 0.3 times of remaining carapace length, meeting in front of ocular lobe, ventral margin finely serrate; siphonal tube not protruding in holotype; anterolateral tooth developed; ventral margin of carapace serrate ocular lobe small; eye lenses missing. Antennal notch round, with small extra tooth in sinus, sinus reaching beyond level of frontal lobe anterior margin; integument smooth, whitish. Five free thoracic segments visible. Pleon subequal in length to carapace + pereion. Pleotelson 1.2 times longer than wide; 0.8 times of uropod peduncle; anal valves visible in dorsal view. Appendages: ovigerous female, 4.3 mm long (paratype ZMH K 64951) Antenna 1 (Fig. 14, A 1 a and A 1 b): relative length of peduncle articles 1 to 3: 37 / 33 / 30 (35 / 34 / 32 in another ovigerous female); second article with 4 broom-like setae and 3 simple setae; third article with one simple seta; accessory flagellum half as long as basal article of main flagellum; main flagellum 3 - articulated, armatures broken off. Maxilliped 2 (Fig. 14, Mxp 2): B / R ratio 0.2, relative length of articles I to D: 6 / 25 / 45 / 18 / 6; basis and ischium unarmed; merus with one plumose seta; carpus with 9 setulate setae; propodus with 10 simple setae along inner margin, one simple seta on outer distal corner; dactylus with one strong simple seta terminally, 4 simple setae sub terminally; rudimentary oostegite with 4 strong setae. Maxilliped 3 (Fig. 14, Mxp 3): B / R ratio 1.6, relative length of articles I to D: 8 / 26 / 26 / 26 / 13; basis with 3 fine plumose setae, 3 plumose seta on outer distal corner; ischium unarmed; merus with one strong plumose seta; carpus with 3 plumose setae; propodus with 3 plumose setae; dactylus with 6 simple setae terminally; exopod present. Pereiopod 1 (Fig. 14, P 1): B / R ratio 0.6, relative length of articles I to D: 9 / 17 / 27 / 26 / 21; basis with 13 plumose setae and one simple seta; ischium and merus unarmed; carpus with 2 simple setae; propodus with 4 simple setae; dactylus with one terminal seta and 4 simple setae sub terminally, one simple seta on outer margin; exopod present. Pereiopod 2 (Fig. 14, P 2): B / R ratio 0.8, relative length of articles I to D: 6 / 21 / 30 / 15 / 28; basis with 4 plumose setae; ischium unarmed; merus with one simple seta and 2 plumose setae; carpus with 2 simple setae; propodus unarmed; dactylus tapering, with one terminal seta, 3 strong simple setae sub terminally, 2 thin simple setae on margins; exopod present. Pereiopod 3 (Fig. 15, P 3): B / R ratio and relative length of articles I to D not given, extremity damaged after merus; basis with 5 plumose setae; ischium with one simple seta; merus with 2 simple setae; exopod present. Pereiopod 4 (Fig. 15, P 4): B / R ratio 1.1, relative length of articles I to D: 18 / 25 / 29 / 20 / 7; basis with 4 plumose and 2 simple setae; ischium with 2 simple setae; merus with one stronger and one thin simple seta; carpus with 2 strong and 2 thin simple setae; propodus with one strong simple seta; dactylus with one strong and one thin seta terminally. Pereiopod 5 (Fig. 15, P 5): B / R ratio 1.0, relative length of articles I to D: 16 / 22 / 30 / 24 / 8; basis with 2 plumose and 2 simple setae; ischium with one strong and 2 thin simple setae; merus with one strong and one thin simple setae; carpus with 2 strong simple setae on outer distal corner; propodus with one strong simple seta; dactylus with one strong and one thin simple seta. Uropods (Fig. 15, U), peduncle 1.2 times longer than endopod and 1.3 times longer than pleonite 6, with 4 cuspidate setae along inner margin; exopod sub equal in length to endopod (measured without terminal seta); endopod 2 - articulated, basal article 3.6 times longer than distal article, with 8 (or 9?) cuspidate setae along inner margin; distal article with 4 simple setae along inner margin, the penultimate one longer than the other, terminal seta fused to distal article. Adult male, ZMH K 64952 (Fig. 16), similar to female besides the sexual dimorphisms: shorter pseudorostrum, antennal notch shallower than in female; stronger basis of extremities; exopod present on pereiopod 4; 2 pairs of pleopods, pleonites 1 and 2 with 1 tooth on ventrolateral margin; A 2 reaching beyond pleonite 3. Distribution: Argentine Basin, 4602 – 4608 m depth. Remarks: The new species is similar to Leucon (A.) medius Bishop, 1982 from Brazil, 1000 – 1580 m depth (see Table 3). Both have lateral conical teeth in male on pleonites 1 and 2, lateral to the insertion of the pleopods. However, there are a few slight differences between the species. The A 1 in the female of the new species is stouter and shorter (fig. 14, A 1 a) than in L. medius; the A 1 of a different and ovigerous female from the present samples is not as slender as in L. medius. There are 17 – 20 strong dorsomedian teeth in ovigerous females to the hind margin of the carapace in the new species but only a weak undulation in L. medius. The antennal notch of the new species is rounded and reaches beyond the frontal line of the frontal lobe, but it is triangular in L. medius and ends at the level of the frontal lobe.	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF16FFED72DAB47C2BD695B0.taxon	diagnosis	Diagnosis of the subgenus: “ branchial siphon normal; antenna 1 accessory flagellum extending at least to midlength of main flagellum first article; pereionite 5 without ventral teeth; uropod endopod terminal seta not fused to distal article ” (Watling, 1991).	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF16FFE872DAB57929A591A0.taxon	description	(Figures 17 – 19) Material: Holotype ovigerous female, ZMH: K 64953, 30 July 2009; SW Atlantic, Brazil Basin, cruise Me 79 / 1, station # 580, 14 ° 58.91 ' S 29 ° 56.49 ' W; 5131 m depth; gear: EBS. Paratypes: Argentine Basin: # 532 — EBS: 1 subadult male, 3 non-ovigerous females (ZMH K 64981). # 533 — EBS: 1 subadult male (developing pleopods), 1 ovigerous female; 4 non-ovigerous females (ZMH K 64982). # 534 — EBS: 6 mancae, 1 ovigerous, 6 non-ovigerous female; 1 VT, broken after carapace; 2 subadult males, 1 adult male (broken after carapace) (ZMH K 64983). Brazil Basin: # 580 — EBS: 1 ovigerous females (dissected; ZMH: K 64954). # 558 — EBS: 1 non-ovigerous female (ZMH K 64998). # 583 — EBS: 2 non-ovigerous females (ZMH K 64984). # 604 — EBS: 3 mancae, 4 non-ovigerous females; 2 ovigerous females (ZMH K 64985). # 605 — EBS: 6 non-ovigerous female, 1 ovigerous female, 1 subadult male, 1 young male (pleopods not yet developed), 3 mancae (ZMH K 64986). # 609 — EBS: 1 manca, 4 non-ovigerous females (ZMH K 64987). # 596 — GKG: 1 manca (ZMH K 64988). Etymology. — The new species with the very long pseudorostrum is named after the famous little boy made of wood whose nose gets very long, described in a children’s book: ” The adventures of Pinocchio ” by Carlo Collodi. Diagnosis. — Pseudorostrum very long, with 0 – 4 pairs of teeth dorsally and 3 – 5 pairs of teeth ventrally, length proportions pseudorostrum to rest of carapace is 0.9; carapace with 5 teeth mediodorsally: 3 on frontal lobe, one in the middle and one posteriorly up to almost hind part of carapace; in smaller females only 6 teeth in the anterior part of the carapace; laterally few scattered teeth, 1 tooth laterally on carapace in the region of the frontal suture; antennal notch small to indistinct; ventral margin of carapace serrate. Description. — Based on holotype, ovigerous female (Fig. 17), 4.6 mm long (ZMH: K 64953). Carapace with 5 teeth mediodorsally: 3 on frontal lobe, one in the middle and one posteriorly; laterally few scattered teeth, ventral margin serrate; pseudorostrum subacute, very long, 0.9 times as long as rest of carapace, with 5 pairs of teeth dorsally and 8 teeth ventrally; siphonal tube not protruding; ocular lobe reduced; eye lenses missing. Antennal notch small; 4 small teeth above antennal notch; anterolateral tooth not prominent; integument whitish. Five free thoracic segments visible. Pleon little shorter (0.9 times) than carapace and thoracic segments combined; Pleotelson 1.1 times wider than long, anal valves visible from above. Appendages: ovigerous female (paratype, ZMH: K 64954) Antenna 1 (Fig. 18, A 1): relative length of peduncle articles 1 to 3: 28 / 33 / 38; 3 plumose setae on article 2, one plumose and one simple setae on article 3; accessory flagellum only little shorter than basal article of main flagellum, with 3 simple setae; main flagellum 4 - articulated; the last one tiny, with 2 simple setae; penultimate article with 3 simple setae. Maxilliped 2 (Fig. 18, Mxp 2): B / R ratio 0.3, relative length of articles I to D: 10 / 26 / 32 / 21 / 12; basis with one pappose seta; ischium unarmed; merus with one pappose seta; carpus with 7 setae; propodus with 4 setulate setae (not figured); dactylus with one strong terminal and 5 simple setae sub terminally; rudimentary oostegite with 6 setae. Maxilliped 3 (Fig. 18, Mxp 3): B / R ratio 0.9, relative length of articles I to D: 7 / 21 / 25 / 27 / 20; basis with 4 pappose setae, 3 strong pappose setae on outer distal corner; ischium unarmed; merus with 2 pappose setae along inner margin, one strong pappose seta on outer distal edge; carpus with 4 pappose setae; propodus with one simple seta on outer distal corner; dactylus with 5 simple setae distally; exopod present, with 2 teeth on basal article. Pereiopod 1 (Fig. 18, P 1): B / R ratio 0.6, relative length of articles I to D: 8 / 13 / 29 / 32 / 18; basis with 5 teeth along margin, with 5 pappose setae; ischium unarmed; merus with one pappose seta; carpus with 6 pappose setae; propodus with 4 simple setae; dactylus with 2 simple setae along margins, 5 simple setae terminally and sub terminally; exopod present, with 2 teeth on basal article. Pereiopod 2 (Fig. 19, P 2): B / R ratio 0.9, relative length of articles I to D: 3 / 18 / 30 / 15 / 33; basis with 6 pappose setae along margin; ischium unarmed; merus with one pappose seta; carpus with 5 pappose setae and 3 simple setae; propodus unarmed; dactylus with 4 pappose and 4 simple setae; exopod present, basal article with 2 teeth. Pereiopod 3 (Fig. 19, P 3): B / R ratio 1.7, relative length of articles I to D: 16 / 21 / 33 / 21 / 9; basis with 4 pappose setae; ischium with one pappose seta; merus with one pappose seta; carpus with 2 simple setae; propodus with one simple seta; dactylus with one strong simple seta terminally; exopod present, with one tooth on basal article. Pereiopod 4 (Fig. 19, P 4): B / R ratio 1.4, relative length of articles I to D: 11 / 26 / 33 / 22 / 9; basis with 4 pappose setae; ischium with one pappose seta; merus with one pappose seta; carpus with one pappose seta; propodus with one pappose seta; dactylus with one strong terminal seta (broken). Pereiopod 5 (Fig. 19, P 5): B / R ratio 1.1, relative length of articles I to D: 16 / 25 / 30 / 19 / 11; basis with 4 pappose setae; ischium with one pappose seta; merus unarmed; carpus with 2 pappose setae; propodus unarmed; dactylus with one strong terminal and one thin subterminal seta. Uropods (Fig. 19, U), pleotelson 0.7 times of uropod peduncle, peduncle with 3 setae along inner margin, little (0.9 times) shorter than uropod endopod basal article; exopod shorter than endopod; endopod 2 articulated; basal article with 6 setae along inner margin, 2.3 times longer than distal article; distal article with one seta on inner margin, 3 strong setae terminally. Distribution: Argentine and Brazil Basin, 4602 – 4608 m depth. Remarks: There are 7 species with a very long pseudorostrum described for the subgenus Leucon (Crymoleucon): L. longirhinus Mühlenhardt-Siegel, 2011 (Southern Oceans, 1983 – 4676), L. grandidentatus Mühlenhardt-Siegel 2011 (Southern Oceans, 3784 – 4698 m), L. macrorhinus Fage, 1951 (Mediterranean, 200 – 1529 m), L. savulescui Petrescu, 1992 (Peru Trench, 4661 – 4723 m), L. serrulirostris Ledoyer, 1988 (eastern Africa, 3716 m), L. nudirhinus Mühlenhardt-Siegel, 205 (Angola Basin, 5395 – 5415 m), and L. tener Hansen, 1920 (Arctic waters, NE Atlantic, 698 – 2702 m). The new species resembles L. longirhinus and L. savulescui in possessing teeth above the subrostral notch. Both species have 2 or 3 teeth above the subrostral notch while the new species has 4 teeth. The other 5 species have no teeth above the subrostral notch. The new species differs from both L. longirhinus and L. savulescui in the presence of teeth on the dorsal side of the pseudorostrum, which are lacking in both L. longirhinus and L. savulescui. The dorsomedian serration on the carapace reaches almost to the hind margin of the carapace, is doubled and more separated in the posterior part in L. savulescui, while in L. longirhinus the dorsomedian serration consists of 10 teeth and reaches up to 2 / 3 of the carapace; in the new species the dorsomedian serration has only 5 teeth, 3 on the anterior part of the frontal lobe, one in the middle and one close to the posterior margin of the carapace. In the new species the pseudorostrum is quite acute, whereas it is blunt in L. longirhinus and with 2 small teeth on the tip in L. savulescui. Also the length proportion of the pseudorostrum to rest of carapace is different in the 3 species: 0.9 in the new species, but 0.4 in L. savulescui and L. longirhinus.	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF13FFE872DAB17C2EC09475.taxon	description	(Figure 20 – 22) Paratypes: Argentine Basin: # 532 — EBS: 1 non-ovigerous female (broken after pereionite 4) (ZMH K 64989). # 533 — EBS: 1 manca, 2 non-ovigerous females (1 figured, 1 was dried), 5 subadult male (2 pairs of pleopods developing) (ZMH K 64990). # 534 — EBS: (sample dried) 5 non-ovigerous females, 2 females, badly damaged (ZMH K 64991). Brazil Basin: # 558 — EBS: 1 manca, 1 ovigerous female (ZMH K 64992). # 561 — EBS: 1 ovigerous female (slightly damaged, dissected), 1 young male (pleopods not yet? developed), 1 male with (A 2 reaching beyond carapace, with brush of setae at basis, but no pleopods), 1 non-ovigerous female; 1 ovigerous female badly damaged (frontal part separated) (ZMH K 64993). Diagnosis. Dorsomedian line anteriorly with 6 – 7 teeth, posteriorly serrate in double row, occasionally 1 tooth antero-laterally on frontal lobe, frontal lobe anteriorly more elevated, length proportion pseudorostrum to rest of carapace is 0.46. Distribution: Southern Atlantic, 4602 to 5142 m depth. Remarks: The habitus and extremities of the female (Figures 20 – 22) resemble very much Leucon (C.) lufupa, which was described for the Angola Basin and the Cape Basin (Mühlenhardt-Siegel, 2010). The setation in the new material looks a little bit poor, mainly due to damaged condition of the material, so e. g. in some of the specimens it is hard to see if the double row of dorsomedian teeth in the posterior part of the carapace is present or not. Furthermore, the exopod of the pereiopod has 4 teeth in L. lufupa and none in the DIVA 3 material. On the other hand, there are 5 teeth above the antennal notch in the DIVA 3 specimens but only 4 in L. lufupa. The specimens from the DIVA 3 expedition resemble in the other characters L. lufupa, especially the length and form of the pseudorostrum is very similar in the specimens from both parts of the southern Atlantic. As the differences in the number of teeth as mentioned above are the only character between the present specimens and those from the Angola and Cape Basins, the DIVA 3 specimens have to remain as L. cf. lufupa.	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF2FFFD472DAB2DD2EBC924C.taxon	diagnosis	Diagnosis of the subgenus: “ branchial siphon normal; antenna 1 accessory flagellum rudimentary; pereionite 5 without ventral teeth; uropod endopod terminal seta not fused to distal article ” (Watling, 1991).	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF2FFFD072DAB32529F4957C.taxon	description	(Figures 23 – 25) Material: Holotype: ovigerous female (ZMH K 64955) (16 July 2009), SW Atlantic, Argentine Basin, FS “ Meteor ” cruise Me 79 / 1 station # 534, 36 ° 00.61 ' S 49 ° 01.54 ' W, 4608 m depth; gear: EBS. Paratypes: Argentine Basin # 532 — EBS: 1 adult male, 2 subadult males, 1 juv. male, 6 non-ovigerous female; 2 mancae, 1 abdomen (ZMH K 64994). # 533 — EBS: 2 adult males, 6 subadult males, 1 juv. male, 4 ovigerous females (1 with pleon broken off), 17 non-ovigerous females, 8 mancae (ZMH K 64995). # 534 — EBS: 1 male pleon; 1 ovigerous female carapace, 3 ovigerous females, 1 ovigerous female 6.1 mm long, dissected; (ZMH K 64956), 32 non-ovigerous females, 22 mancae, 5 adult males, 9 subadult males, 1 juvenile male (ZMH K 64996). Brazil Basin # 604 — EBS: 1 adult male (ZMH K 64997). Etymology. — The new species is named “ brevirostratis ” (Lat. brevis = short and rostratis = rostrum) because of its short pseudorostrum. Diagnosis. — Carapace with anterior margin serrate above antennal notch, dorsomedian line serrate to end of carapace; no lateral teeth on carapace; antennal notch triangular and small; exopods of maxilliped 3, P 1 – P 3 in females with teeth. Description. — Based on holotype (Fig. 23), ovigerous female, 6.5 mm long (ZMH K 64955) Carapace 1.1 times longer than free thoracic segments; dorsomedian line serrate with 24 teeth to the end of carapace, no lateral teeth; pseudorostral lobes 0.2 length of rest of carapace, directing slightly upwards; siphonal tube little protruding; ocular lobe reduced; eye lenses missing; antennal notch triangular, reaching backwards to level of ocular lobe; anterolateral tooth prominent; anterior margin serrate with at least 8 teeth; anteroventral margin of carapace serrate; integument whitish, roughened. Five free thoracic segments visible, first shortest. Pleon as long as carapace and free thoracic segments combined. Pleotelson 1.1 times longer than wide. Appendages: ovigerous female, 6.1 mm long (Fig. 24), paratype (ZMH K 64956) Antenna 1 (Fig. 24, A 1): relative length of peduncle articles 1 to 3: 46 / 26 / 28; accessory flagellum tiny, main flagellum 3 articulated. Maxilliped 2 (Fig. 24, Mxp 2): B / R ratio 0.5, relative length of articles I to D: 7 / 27 / 32 / 23 / 12; basis with one pappose seta; ischium and merus unarmed; carpus with one pappose seta and 12 simple setae along inner margin; propodus with one strong pappose seta, 7 simple setae; dactylus one strong terminal seta, 2 simple setae sub terminally. Maxilliped 3 (Fig. 24, Mxp 3): B / R ratio 1.4, relative length of articles I to D: 7 / 21 / 36 / 24 / 12; basis with 5 pappose setae along inner margin, 4 pappose seta on distal margin; ischium unarmed; merus with 2 pappose setae; carpus with 3 teeth and one simple seta on outer margin, 6 pappose setae along inner margin; propodus with one simple and one pappose seta; dactylus with one terminal seta and 3 sub terminal simple setae; exopod present basal article serrate. Pereiopod 1 (Fig. 24, P 1): B / R ratio 0.8, relative length of articles I to D: 9 / 18 / 33 / 23 / 17; basis with 4 teeth along outer margin and 11 pappose setae on margins; ischium with one tooth; merus with one tooth, one simple seta and 2 pappose setae; carpus with 4 pappose setae and 4 simple setae; propodus with 4 simple and 3 pappose setae; dactylus with one terminal and 6 simple setae; exopod present, basal article with 5 teeth. Pereiopod 2 (Fig. 24, P 2): B / R ratio 0.9, relative length of articles I to D: 4 / 25 / 27 / 15 / 29; basis with 6 pappose setae; ischium with one pappose seta; merus with 4 pappose setae; carpus with 2 simple setae; propodus unarmed; dactylus with 3 longer and 6 shorter simple setae; exopod present, basal article with 4 teeth. Pereiopod 3 (Fig. 25, P 3): B / R ratio 1.8, relative length of articles I to D: 14 / 24 / 32 / 22 / 8; basis with one simple seta and 6 pappose setae; ischium with 3 pappose setae; merus with one pappose setae; carpus with 2 long pappose setae, one long and one short simple setae; propodus with one long simple seta distally; dactylus with one terminal simple seta; exopod present, basal article with 3 teeth. Pereiopod 4 (Fig. 25, P 4): B / R ratio 1.2, relative length of articles I to D: 15 / 20 / 33 / 23 / 8; basis with 7 pappose setae; ischium with one pappose seta; merus with 2 pappose setae; carpus with one pappose seta medially, 2 plumose setae and one simple long seta distally; propodus with one long simple seta; dactylus with one long simple seta terminally. Pereiopod 5 (Fig. 25, P 5): B / R ratio 1, relative length of articles I to D: 14 / 22 / 33 / 24 / 8; basis one simple, one pappose and one broom seta; ischium with one simple and one pappose seta; merus with one simple seta; carpus with one pappose seta, one short simple and 3 strong simple setae; propodus with one long simple seta; dactylus with one long simple seta terminally. Uropods (Fig. 25, U), peduncle slightly longer than pleonite 6, with 3 cuspidate setae along inner margin; exopod longer than endopod; endopod 2 articulated, basal article 1.4 times longer than distal article, with 7 cuspidate setae along inner margin, the distal one largest; distal article with 6 cuspidate setae along inner margin, 3 strong setae terminally. Adult male: antero-dorsomedian line with 2 or 3 teeth (in higher magnification 17 small teeth nearly reaching hind margin), antennal notch shallow, anterior margin of carapace serrate above antennal notch; A 1 accessory flagellum about half as long as basal article of main flagellum, A 2 reaching beyond thoracic segments; subadult male with 2 pairs of developing pleopods: anterior margin of carapace above antennal notch serrate up to pseudorostrum tip, dorsomedian line serrate until end of carapace (26 teeth), antennal notch at level of ocular lobe; antennal notch small, triangular. Uropod exopod longer than endopod, which has 2 articles. Distribution: Argentine and Brazil Basin, 4602 to 5188 m depth. Remarks: There are only few species in the subgenus Leucon with this combination of characters: antennal notch ending on level with anterior margin of frontal lobe, no teeth on frontal lobe or laterally on carapace, dorsomedian serration to the hind margin of carapace as in the new species: Leucon affinis Fage 1951 from the Mediterranean (180 – 415 m depth), Leucon serratus Norman, 1879 from the Arctic region (2200 – 3200 m depth) and Leucon echinolophotus Gerken 2016, off Enderby Land, Antarctica (386 – 400 m depth). The new species differs from these in the following characters: there is no gap in the dorsomedian serration on the carapace before the last tooth in the new species but there is a gap in L. affinis, L. serratus and L. echinolophotus; the length proportion “ pseudorostrum to rest of carapace ” is 0.2 in the new species but 0.36 in L. affinis, 0.26 in L. serratus and 0.19 in L. echinolophotus; the exopod of at least pereiopod 2 has 4 teeth in the new species but no teeth in L. affinis and L. echinolophotus, no information for L. serratus; there are 8 teeth in the new species on the anterior margin of the carapace above the antennal notch but no teeth in L. affinis, L. serratus and L. echinolophotus. The pseudorostrum of the new species is 0.2 times of carapace length and shorter than in Remyleucon hyalorostris n. g., n. sp. (see below).	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF2BFFDB72DAB43529E996D2.taxon	description	(Figures 26 – 29) Material: Holotype non-ovigerous female, ZMH: K 64957 (16 July 2009); SW Atlantic, Argentine Basin, FS “ Meteor ” cruise Me 79 - 1, station # 534, 49 ° 01.54 ' W 36 ° 00.61 ' S, 4608 m depth, gear: EBS. Paratypes: Argentine Basin # 533 — EBS: 1 non-ovigerous female (ZMH K 65768). # 534 — EBS: 1 sub adult male (figured; ZMH K 64959), 1 sub adult male (2 pairs of developing pleopods; dissected; ZMH K 64958), 1 cephalothorax, damaged; 1 non-ovigerous female (only carapace plus thoracic segments) (ZMH K 64999). Brazil Basin # 604 — EBS: 1 manca, 1 ad male (pleon broken off) (ZMH K 65000). # 609 — EBS: 2 non-ovigerous females (ZMH K 65001). Etymology. — The new species is named “ paravasilei ” because of the resemblance to Leucon vasilei Petrescu 1994, described for the south eastern Pacific off central Chile (3279 m depth) waters. Diagnosis. — Carapace dorsomedian line with 2 – 3 teeth anterior and 8 – 10 teeth posterior to the gap, several teeth laterally above frontal lobe fissure, occasionally one tooth below frontal lobe fissure; pseudorostral lobes directed straight forward, without teeth above or below, 0.3 of rest of carapace. Description. — based on holotype, non-ovigerous female (Fig. 26), 5.7 mm long, ZMH K 64957). Carapace dorsomedially with 2 teeth anterior and 10 teeth posterior to the gap, several teeth laterally above frontal lobe fissure, occasionally one tooth below frontal lobe fissure; pseudorostral lobes directing straight forward, without teeth above or below, 0.3 of rest of carapace; siphonal tube little protruding; ocular lobe reduced; eye lenses missing. Antennal notch reaching backwards to level of ocular lobe; anterolateral tooth produced; anteroventral margin of carapace smooth; integument whitish, smooth. Five free thoracic segments visible, first shortest; as long as carapace (including pseudorostrum). Pleon approximately as long as carapace plus free thoracic segments. Pleotelson as wide as long, anal valves little protruding. Appendages: subadult male, 5.4 mm long, paratype (ZMH K 64958). Antenna 1 (Fig. 27, A 1): relative length of peduncle articles 1 to 3: 37 / 37 / 25; accessory flagellum very short, main flagellum broken after second article. Maxilliped 2 (Fig. 25, Mxp 2): B / R ratio not given, basis broken during dissection, relative length of articles I to D: 5 / 28 / 35 / 18 / 14; basis with one pappose seta on inner distal corner; ischium unarmed; merus with one pappose seta and 4 simple setae; carpus with 12 simple setae; propodus with one strong pappose seta and 11 simple setae along inner and distal margin; dactylus with one strong simple seta terminally, 4 simple setae sub terminally. Maxilliped 3 (Fig. 27, Mxp 2): B / R ratio 0.8, relative length of articles I to D: 7 / 19 / 36 / 23 / 16; basis distal outer edge dilated, with 3 strong pappose setae, 4 pappose setae along inner margin; ischium unarmed; merus with 2 pappose setae on inner margin, one strong pappose seta on outer distal edge; carpus with 3 pappose setae on inner margin; propodus with 2 simple setae on inner margin, 3 pappose setae on outer distal corner; dactylus with 4 simple setae on distal margin; exopod present. Pereiopod 1 (Fig. 27, P 1): B / R ratio and relative length of articles I to D not given, broken after basis; basis with 6 pappose setae and 2 short, strong setae each with 6 setulae Pereiopod 2 (Fig. 27, P 2): B / R ratio 1.2, relative length of articles I to D: 5 / 24 / 27 / 19 / 25; basis with 9 pappose setae; ischium with one pappose seta; merus with 2 pappose setae and one simple seta; carpus with one pappose seta and 4 simple setae; propodus unarmed; dactylus with 2 plumose and 7 simple setae; exopod present. Pereiopod 3 (Fig. 28, P 3): B / R ratio 3.0, relative length of articles I to D: 16 / 28 / 28 / 20 / 8; basis with 13 pappose setae; ischium with one simple seta; merus with one simple seta; carpus with 2 pappose setae; propodus with one simple seta; dactylus fused with terminal seta; exopod present. Pereiopod 4 (Fig. 28, P 4): B / R ratio 1.6, relative length of articles I to D: 22 / 23 / 27 / 20 / 8; basis with 9 pappose setae; ischium with one pappose seta; merus with one simple seta and 2 pappose setae; carpus with 2 pappose setae on outer distal corner; propodus with one simple seta; dactylus with one simple seta terminally; exopod present. Pereiopod 5 (Fig. 28, P 5): B / R ratio 1.3, relative length of articles I to D: 20 / 25 / 25 / 20 / 9; basis with 5 pappose setae; ischium with 2 long simple setae; merus with one simple seta; carpus with one simple and 2 serrulate setae; propodus with one long and one shorter simple setae; dactylus with strong terminal seta. Uropods (Fig. 28, U), peduncle with 2 simple setae along inner margin, subequal in length to pleonite 6; exopod longer then endopod; endopod 2 - articulated, first article as long as peduncle, with 6 simple setae along inner margin; second article with 3 cuspidate-serrulate setae along inner margin, one strong terminally serrate seta; 0.4 times in length of article 1. Subadult male with developing 2 pairs of pleopods (Fig. 29), 6.1 mm long (ZMH K 64959); no dorsomediane serration; 3 teeth laterally above frontal lobe fissure; antennal notch shallow, with 3 teeth at base of pseudorostrum; exopods of pereiopods with basis dilated. Distribution: Argentine and Brazil Basins, 4608 to 5180 m depth. Remarks: The new species has the uropod endopod longer than the exopod, and the anterior tip and ventral margin of the pseudorostrum smooth as in L. vasilei Petrescu 1994. However, in L. vasilei there is only one tooth dorsomedially in the frontal lobe area and a pair of teeth on the pseudorostral lobe base, whereas in the new species both sexes have 3 teeth above the frontal lobe fissure. The uropod exopod reaches the articulation of the first article of the endopod in L. vasilei (beyond articulation in the new species).	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF20FFC272DAB79F29D295B0.taxon	diagnosis	Diagnosis. Dorsomedian line on carapace serrate up to half in male, in female: dorsomedian 15 teeth up to the end of carapace; pseudorostrum projecting anteriorly, pseudorostrum with little dorsal extra tip, pseudorostral lobes with anteroventral part hyaline, anterior margin of carapace smooth; antennal notch shallow, in front of ocular lobe in non-ovigerous females; A 1 geniculate after basal article 1; male antenna 2 reaches past carapace but not beyond pereionite 3, flagellum not modified for grasping; exopods on pereiopods 1 – 3 in female, 1 – 4 in male; uropod endopod 2 - articulated; adult male without pleopods. Etymology: The new genus is dedicated to the author’s little black feline friend named Remy. Remarks: Regarding the lack of pleopods in adult males this new genus resembles Alleoleucon, Austroleucon, Hemileucon, Heteroleucon, and Nippoleucon. The flagellum of the antenna 2 in the new genus is not modified for grasping, and extends past the carapace but not to the end of the pereion. In contrast, the flagellum is modified for grasping in Nippoleucon, the flagellum does not extend beyond the carapace in Heteroleucon and Alleoleucon, and the flagellum extends to the end of the pereion in Austroleucon and Hemileucon.	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
9F2B0602AF20FFC272DAB79F29D295B0.taxon	type_taxon	Type species: Remyleucon hyalorostris sp. nov. (Figures 30 – 36) Material: Holotype preparatory female, ZMH: K 64960 (15 July 2009); SW Atlantic, Argentine Basin, FS “ Meteor ” cruise Me 79 - 1, station # 533, 36 ° 00.20 ' S 49 ° 01.96 ' W; 4602 m depth; gear: EBS. Paratypes: Argentine Basin # 532 — EBS: 2 adult males (one with pleon broken off), 5 subadult males, 22 non-ovigerous females, 1 ovigerous female (ZMH K 65002). # 533 — EBS: 18 adult males (1 figured, ZMH K 64963, 1 dissected 5, 4 mm, ZMH K 64964), 10 subadult males, 10 ovigerous females (1 dissected 5, 5 mm long, ZMH K 64961; most of them more or less slightly damaged), 125 preparatory females, 33 mancae, 1 exuvia of ovigerous female, 1 carapace only (ZMH K 65003). # 534 — EBS: 40 adult males, 10 subadult males, 1 juv. male, 144 non-ovigerous females, 11 ovigerous female (1 damaged), 101 mancae, 16 carapaces only (ZMH K 65004). Etymology. — The new species is named after the hyaline anteroventral part of the pseudorostrum. Diagnosis. — A striking character of the new species is the hyaline anteroventral part of the pseudorostrum. Description. — based on holotype, preparatory female (Fig. 30), 5.8 mm long, (ZMH K 64960). Carapace with dorsomedian serration of 15 teeth up to the end of carapace; no lateral teeth on carapace; pseudorostral lobes with anteroventral part hyaline, 0.3 times length of rest of carapace; siphonal tube not protruding; ocular lobe reduced; eye lenses absent; antennal notch reaching backwards beyond level of ocular lobe; anterolateral tooth developed; anterior margin of carapace smooth; anteroventral margin of carapace serrate; integument whitish. Five free thoracic segments visible, first slightly shorter than second to fifth; 0,75 times shorter than carapace including pseudorostrum. Pleon as long as carapace plus free thoracic segments. Pleotelson 1.1 times longer than wide. Appendages: ovigerous female (5.5 mm long, ZMH K 64961) Antenna 1 (Fig. 31, A 1): geniculated after basal article 1; relative length of peduncle articles 1 to 3: 27 / 23 / 50; accessory flagellum small, main flagellum 3 - articulated, basal article longest. Left mandible (Fig. 31, Md): with 2 setae on corpus mandibulae under lacinia mobilis, basis truncated; Maxilliped 2 (Fig. 31, Mxp 2): B / R ratio 0.6, relative length of articles I to D: 11 / 26 / 34 / 21 / 8; on coxa proximally with 5 setae on rudimentary oostegite; basis with one strong pappose seta distally; ischium unarmed; merus with one strong pappose seta; carpus with 7 plumose setae; propodus with 8 simple setae along inner margin; dactylus with one strong terminal seta, 5 simple setae sub terminally. Maxilliped 3 (Fig. 31, Mxp 3): B / R ratio 1.2, relative length of articles I to D: 8 / 25 / 28 / 22 / 17; basis with six pappose setae along inner margin, one simple seta proximally, 2 stronger simple setae distally, outer distal corner with 3 strong pappose setae; ischium unarmed; merus with one pappose seta; carpus with 2 pappose setae; propodus with one pappose seta, 2 simple setae; dactylus with one terminal simple seta, 3 simple setae sub terminally, one simple seta medially; exopod present, basal article with 2 teeth. Pereiopod 1 (Fig. 31, P 1): B / R ratio 0.6, relative length of articles I to D: 9 / 18 / 31 / 19 / 22; basis with 9 pappose setae, 2 strong simple setae; ischium unarmed; merus with one simple seta; carpus with 3 pappose setae and one simple seta; propodus with 4 simple setae; dactylus with 8 simple setae; exopod present, basal article with one tooth. Pereiopod 2 (Fig. 31, P 2): B / R ratio 0.5, relative length of articles I to D: 4 / 24 / 30 / 15 / 27; basis with 4 pappose and 4 simple setae; ischium with one pappose seta; merus with 4 pappose setae and one simple seta; carpus with 3 strong simple setae; propodus unarmed; dactylus with 2 pappose and 6 simple setae; exopod present. Pereiopod 3: damaged. Pereiopod 4 (Fig. 32, P 4): B / R ratio 0.9, relative length of articles I to D: 15 / 38 / 25 / 16 / 7; basis with 5 pappose setae; ischium unarmed; merus with one simple seta and 2 pappose setae; carpus with 2 long simple setae; propodus with one long simple seta; dactylus with one strong simple seta terminally. Pereiopod 5 (Fig. 32, P 5): B / R ratio 1.1, relative length of articles I to D: 14 / 36 / 24 / 18 / 8; basis with one pappose, one compound seta, and 2 simple setae; ischium with one pappose seta, merus with 3 simple setae; carpus with 2 strong simple setae distally; propodus with 1 strong simple seta distally; dactylus with strong terminal seta. Uropods (Fig. 32, U): damaged, 2 - articulated endopod slightly shorter than peduncle, exopods broken off. Peduncle with 6 cuspidate setae along inner margin; basal article of endopod with 6 cuspidate setae along inner margin, 1 small cuspidate seta on outer distal corner; distal article shorter than basal, with 4 cuspidate setae along inner margin, 2 cuspidate setae subterminally, 2 strong, broken setae terminally. Adult male (Fig. 33) (paratype, ZMH K 64963): anterior tip of pseudorostral lobes in dorsal view each with 1 small tooth, anterior margin serrate; antennal notch shallow, subrostral tooth reduced; dorsomedian line with 10 teeth extending posteriorly little more than half of carapace; exopods on pereiopods with basal article dilated. Appendages of dissected paratype, adult male, 5.4 mm long (ZMH K 64964). Antenna 1 (Fig. 34, A 1): relative length of peduncle articles 1 to 3: 47 / 31 / 23; accessory flagellum less than half as long as basal article of main flagellum; main flagellum 3 - articulated. Antenna 2 (Fig. 34, A 2): flagellum reaching not beyond pereionite 3, few setae on each flagellum article; simple setae in peduncle article 4 and 5. Left mandible (Fig. 32, Md): with 3 setae on corpus mandibulae under lacinia mobilis, basis truncated. Maxilliped 2 (Fig. 35, Mxp 2): B / R ratio 0.6, relative length of articles I to D: 9 / 30 / 30 / 21 / 10; basis with long and strong pappose seta; ischium and merus unarmed; carpus with 9 (12) setulate setae along inner margin; propodus with one strong pappose seta from proximal region and 11 setulate setae along inner and distal margin; dactylus with strong simple seta terminally. Maxilliped 3 (Fig. 35, Mxp 3): B / R ratio 1.4, relative length of articles I to D: 9 / 16 / 34 / 28 / 14; basis with 8 pappose setae along inner, 1 pappose seta on outer margin and 3 long pappose setae on outer distal corner; ischium unarmed; merus with 2 pappose setae and one long pappose seta on outer distal corner; carpus with 5 pappose and one simple setae; propodus with one simple and 4 pappose setae; dactylus with one terminal simple seta, 3 long simple setae sub terminally; exopod present. Pereiopod 1 (Fig. 35, P 1): B / R ratio 1.0, relative length of articles I to D: 8 / 21 / 28 / 21 / 20; basis with 14 pappose setae along margins, 2 strong simple setae on inner distal corner; ischium unarmed; merus with 2 pappose setae on inner and distal margins, one long pappose setae on outer distal edge; carpus with 2 pappose and 2 simple setae; propodus with one simple and one pappose seta; dactylus with one terminal simple seta, 3 long 2 short simple setae sub terminally and one short simple seta medially; exopod present. Pereiopod 2 (Fig. 36, P 2): B / R ratio 0.9, relative length of articles I to D: 8 / 27 / 25 / 16 / 24; basis with 8 pappose setae; ischium unarmed; merus with one simple seta and 3 pappose setae; carpus with 2 strong simple setae; propodus unarmed; dactylus with 5 strong simple setae distally, 3 pappose setae sub terminally; exopod present. Pereiopod 3 (Fig. 36, P 3): B / R ratio 1.2, relative length of articles I to D: 29 / 27 / 24 / 15 / 5; basis with 6 pappose setae; ischium with 1 simple and 1 pappose seta; merus with one pappose seta; carpus with one pappose seta and 2 strong simple setae; propodus with one strong simple seta; dactylus with one strong simple seta terminally; exopod present. Pereiopod 4 (Fig. 36, P 4): B / R ratio 1.0, relative length of articles I to D: 22 / 39 / 20 / 14 / 5 basis with 4 pappose setae; ischium unarmed; merus with one simple and one pappose setae; carpus with one pappose seta and 2 strong simple setae; propodus with one strong simple seta; dactylus with one strong simple seta terminally and one simple seta sub terminally; exopod present. Pereiopod 5 (Fig. 36, P 5): B / R ratio 0.8, relative length of articles I to D: 18 / 38 / 24 / 15 / 5; basis with one pappose seta; ischium with one simple seta; merus with 2 simple setae; carpus with one pappose seta and 2 strong simple setae; propodus with one strong simple seta; dactylus with one strong simple seta terminally. Uropods (Fig. 36, U), peduncle 1.2 times longer than pleonite 6, with 7 simple setae along inner margin; exopod subequal in length to endopod; endopod 2 - articulated, basal article of endopod half as long as uropod peduncle; first article with 7 setae along inner margin, 2.1 times longer than distal article; distal article with 6 setae along inner margin, 2 strong simple setae terminally, one short simple seta on outer corner. Distribution: Argentine Basin, 4602 to 4608 m depth. Remarks: The most striking character of the new genus and species is the hyaline anteroventral part of the pseudorostrum, a character new for the family. In males the ischium of pereiopod 3 is slightly longer than merus. Additional features are given in the remarks for the genus (see above).	en	Mühlenhardt-Siegel, Ute (2025): The cumacean family Leuconidae in the south-west Atlantic deep-sea basins obtained during the cruise DIVA 3 with RV Meteor (cruise No. M 79 / 1). Zootaxa 5716 (2): 151-206, DOI: 10.11646/zootaxa.5716.2.1, URL: https://doi.org/10.11646/zootaxa.5716.2.1
