Eudorella helenae, Brito & Serejo, 2023

Brito, Ayrton Do Ramo & Serejo, Cristiana Silveira, 2023, Leuconidae Sars, 1878 (Crustacea: Cumacea) from the southwestern Atlantic, filling the distribution gap along the Brazilian coast, Zootaxa 5383 (2), pp. 101-134 : 121-125

publication ID	https://doi.org/ 10.11646/zootaxa.5383.2.1
publication LSID	lsid:zoobank.org:pub:996315A6-A209-4DF7-B59C-0B7662741F37
DOI	https://doi.org/10.5281/zenodo.10350642
persistent identifier	https://treatment.plazi.org/id/F04DD8B8-C997-43EF-AFE4-024730432B38
taxon LSID	lsid:zoobank.org:act:F04DD8B8-C997-43EF-AFE4-024730432B38
treatment provided by	Plazi
scientific name	Eudorella helenae
status	sp. nov.

Treatment

Eudorella helenae sp. nov.

( Fig. 1D View FIGURE 1 , 11 View FIGURE 11 , 12 View FIGURE 12 and 13 View FIGURE 13 )

Material examined. Holotype female, 2.8 mm, #SANSED6 A03- R2 (500), MNRJ 30572 View Materials .

Paratypes: female, 3.1 mm, HAB11 A3, MNRJ 28957 View Materials (dissected, lost inthe fire) ; female, 2.6 mm, #SANSED5 G03- R2 (500) , MNRJ 30571 View Materials (dissected) ; 2 females, 2.4 mm, #SANSED6 A03- R2 (500) , MNRJ 30573 View Materials ; female, 2.4 mm, #SANSED6 A03- R3 (500) , MNRJ 30574 View Materials ; 11 females, 1.2–2.4 mm, male, 2.0 mm, #SANSED6 A03- R3 (300) , MNRJ 30575 View Materials ; female, 2.5 mm, #SANSED6 C03- R2 (500) , MNRJ 30576 View Materials ; male, 2.4 mm, #SANSED5 G03- R3 (500) , MNRJ 30577 View Materials ; male, 2.4 mm, #SANSED5 H03- R2 (500) , MNRJ 30578 View Materials ; male, 2.4 mm, #SANSED5 H03- R3 (500) , MNRJ 30579 View Materials ; male, 2.1 mm, 3 females, 1.6–1.8 mm, #SANSED5 H03- R3 (300) , MNRJ 30580 View Materials ; 3 females, 2.1– 1.5 mm, #SANSED9 A03- R1 (300) , MNRJ 30581 View Materials ; female, 2.7 mm, #SANSED9 B03- R2 (500) , MNRJ 30582 View Materials ; female, 2.4 mm, #SANSED9 B03- R3 (300) , MNRJ 30583 View Materials ; female, 2.6 mm, #SANSED9 B04- R3 (500) , MNRJ 30570 View Materials ; female, 1.8 mm, #SANSED9 E02- R1 (300) , MNRJ 30584 View Materials ; female, 2.0 mm, #SANSED9 E02- R2 (500) , MNRJ 30585 View Materials ; female, 1.5 mm, #SANSED9 E02- R3 (300) , MNRJ 30586 View Materials ; female, 2.8 mm, #SANSED9 F03- R3 (500) , MNRJ 30587 View Materials ; 2 females, 2.7 mm, #SANSED9 G03- R1 (500) , MNRJ 30588 View Materials ; male, 1.7 mm, female 1.1 mm, #SANSED9 G03- R3 (300) , MNRJ 30589 View Materials ; female, 2.8 mm, #SANSED9 G04- R3 (500) , MNRJ 30590 View Materials ; male, 2.4 mm, female 2.4 mm, #SANSED9 H03- R1 (500) , MNRJ 30591 View Materials ; female, 1.5 mm, SANSED9 H03- R1 (300) , MNRJ 30592 View Materials ; 2 female, 1.8 and 1.9 mm, #SANSED9 H03- R2 (500) , MNRJ 30593 View Materials ; male, 2.3 mm, #SANSED9 H03- R2 (300) , MNRJ 30594 View Materials .

Additional material (lost inthe fire): male, 2.5 mm, #HAB11 A3, MNRJ 28958 View Materials ; 3 females, 2–2.5 mm. #HAB7 A6, MNRJ 28953 View Materials ; female, 2 mm, #HAB11 A1, MNRJ 28954 View Materials ; 12 females, 1.8–3 mm, 3 males, 2.1–2.4 mm. #HAB11 A2, MNRJ 28955 View Materials ; 19 females, 1.6–3.1 mm, 14 males, 1.9–2.5 mm, #HAB11 A3, MNRJ 28956 View Materials ; 31 females, 1.7–3.3 mm, 5 males, 2.1–2.3 mm, #HAB13 A3, MNRJ 28959 View Materials ; female, 2.5 mm, #HAB13 H5, MNRJ 28960 View Materials ; female, not measured, #HAB17 A2, MNRJ 28961 View Materials ; 14 females, 1.5–2.5 mm, male, notmeasured, #HAB17 A3, MNRJ 28962 View Materials ; female, 3.5 mm, male, 2.1 mm, #HAB17 A4, MNRJ 28963 View Materials ; female, 1.3 mm, # AMB3 View Materials E5, MNRJ 28952 View Materials .

Development. Females: mature longer than 2.4 mm, preparatory between 2.1–2.4, immature between 1.5 and 2.1 mm, manca 2 shorter than 1.5 mm. Male: mature unknown, preparatory longer than 2.5 mm, second immature between 2.0 and 2.4 mm, first immature shorter than 1.8 mm.

Type locality. Santos Basin, PR, Brazil, 26°09’25”S – 47°13’00”W; 100 m.

Distribution. Brazil: Santos Basin (RJ, SP, PR, SC), Campos Basin (RJ), Espírito Santo Basin (ES); 25– 392 m.

Etymology. the name “ helenae ” is in honor of Dr. Helena Lavrado (IB/UFRJ) coordinator of the PCR-BS project, and one of the professors of the first author during his master’s degree.

Diagnosis. Body covered with many setae. Pseudorostrum lobes with numerous long simple setae. Small peak between pseudorostrum and frontal lobe. Carapace ventral corner rounded and with serration. Pereopod 2 merus as long as carpus and dactylus with 12 long simple setae. Uropodal exopod slightly longer than endopodal article 1, endopodal article 2 with terminal setae fused.

Description: Holotype, mature female, MNRJ 30572.

Mature female, 2.8 mm. Carapace 0.7 times pereon length including pseudorostrum frontal margin, with many setae on integument, longer and tiny lateral setae behind frontal lobe, unarmed dorsally; pseudorostrum totally dorsal, with brush of dorsal setae, tip extending slightly higher than frontal lobe making a peak; antennal notch as large sinus with row of 3 teeth above; anteroventral corner rounded with serration. Pleon 0.6 times total body length with many scattered setae ( Figs. 1 Dand View FIGURE 1 11 View FIGURE 11 ).

Paratype. Mature female, 3.1 mm, MNRJ 28904 View Materials (lost inthe fire) .

Antenna 1, geniculate between articles 2 and 3; article 1, 0.6 times article 2 length, with plumose setae; article 2, 1.6 times longer than 3 with plumose setae; article 3 with plumose setae; main flagellum of 3 articles, article 1 with 3 plumose setae on inner margin and distal simple seta, article 2 with 2 distal simple setae, article 3 with simple setae and 2 aesthetascs; accessory flagellum of 1 article, slightly shorter than main flagellum article 1 ( Fig. 12 a View FIGURE 12 1 View FIGURE 1 ).

Antenna 2 rudimentary ( Fig. 12 a View FIGURE 12 2 View FIGURE 2 ).

Mandibles, basis truncate, incisor with 2 distal simple setae, lacinia mobilis with 4 cusps ( Fig. 12 View FIGURE 12 md).

Maxilla 1 with 2 endites, palp with one bristle (broken during dissection) ( Fig. 12 View FIGURE 12 mx1).

Maxilla 2 with 3 endites; broad endite with row of distal plumose setae; narrow endites with simple setae ( Fig. 12 View FIGURE 12 mx2).

Maxilliped 1, basis with long plumose seta; ischium absent; carpus and propodus with plumose setae at outer distal corner and numerous plumose setae on inner margin; dactylus with strong terminal and 2 subterminal plumose setae ( Fig. 12 View FIGURE 12 mxlp 1).

Maxilliped 2, basis about 0.4 times length of remainingarticles together, with plumose seta at distal inner corner; merus with plumose setae on distal inner margin; carpus with 4–5 plumose setae along inner margin; propodus with long plumose seta on outer margin and about 7 plumose setae on inner margin; dactylus with strong terminal setae and 2 subterminal simple setae ( Fig. 12 View FIGURE 12 mxlp 2).

Maxilliped 3, basis 0.9 times length of remaining articles together, with plumose setae on inner margin, distolateral corner with 3 long plumose setae; ischium with plumose setae on inner margin; merus with long plumose seta at distal outer corner and plumose setae on inner margin; carpus with plumose setae on inner margin and long simple seta at outer corner; dactylus with strong terminal seta and 2 subterminal simple setae; exopod flagellum with 3 articles ( Fig. 12 View FIGURE 12 mxlp3).

Pereopod 1, basis 0.3 times length of remaining articles together with plumose setae; ischium naked; merus, carpus and propodus with tiny plumose setae; dactylus with strong terminal simple setae a 3 pair of subterminal simple setae. exopod flagellum with 4 articles ( Fig. 12 p View FIGURE 12 1 View FIGURE 1 ).

Pereopod 2, basis 0.7 times length of remaining articles together with simple and plumose setae; ischium absent; merus with tiny plumose setae; carpus with cuspidate setae at outer corner; propodus naked; dactylus with 12 long simple setae ( Fig. 13 p View FIGURE 13 2 View FIGURE 2 ).

Pereopod 3, basis 1.25 times length of remaining articles together with plumose setae; ischium with simple seta; merus with long plumose setae; carpus with plumose setae; propodus with annulate seta; dactylus small with long simple setae ( Fig. 13 p View FIGURE 13 3 View FIGURE 3 ).

Pereopod 4, basis 1.6 times length of remaining articles together with plumose setae; ischium naked; merus with 2 long plumose seta; carpus with plumose setae; propodus with simple and annulate setae; dactylus small with long simple seta ( Fig. 13 p View FIGURE 13 4 View FIGURE 4 ).

Pereopod 5, basis 1.4 times length of remaining articles together with plumose setae; ischium, merus with plumose setae; carpus with plumose setae; propodus with annulate seta; dactylus small with long simple seta ( Fig. 13 p View FIGURE 13 5 View FIGURE 5 ).

Uropod peduncle longer than pleonite 6 with 4–6 cuspidate setae on inner margin, dorsodistal seta longer than half peduncle (but often broken); endopod 2-articulate, article 1, 3.5 times article 2 length (excluding terminal seta), with 6 cuspidate setae on inner margin, article 2 with 2 cuspidate setae on inner margin, terminal setae fused to article; exopod slightly longer than endopodal article 1 with 5 plumose setae on inner margin and 3 terminal plumose setae ( Fig. 13 u View FIGURE 13 ).

Variations: Tooth under antennal notch variates in sizeon mature females ( Fig. 12 View FIGURE 12 c-female and 13). Preparatory male, carapace without antennal notch, 3 teeth on frontal margin, anteroventral corner rounded with 3 teeth ( Fig. 12 View FIGURE 12 c-male).

Youngest stages may be more setose along the body. Outer subterminal setae of uropodal endopod may be longer or shorter than terminal setae.

Remarks: Eudorella helenae sp. nov. belongs to a Eudorella group with uropodal endopod terminal setae fused to article. Among this group, E. hispida Sars, 1871 is the most similar to Eudorella helenae sp. nov. in presenting many setae along the body, pseudorostral lobes with numerous long setae, uropodal exopod slightly longer than endopodal article 1 ( Watling 1991). However, E. helenae sp. nov. differs from E. hispida in tip of the pseudorostrum extending slightly higher than frontal lobe making a peak (versus not extending, peak absent), anteroventral corner rounded with small serration and one tooth under antennal notch (versus anteroventral corner with large acute tooth, 2 teeth under antennal notch); pereopod 2 merus as long as carpus (versus pereopod 2 carpus 1.5 times longer than merus) ( Sars 1871; Hansen 1920; Watling 1991).