Delavalia profunda, Gómez, 2021
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publication ID |
https://doi.org/ 10.11646/zootaxa.5051.1.12 |
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publication LSID |
lsid:zoobank.org:pub:A99E653A-EBDF-48B1-BF24-0194136E03F9 |
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DOI |
https://doi.org/10.5281/zenodo.5563557 |
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persistent identifier |
https://treatment.plazi.org/id/E1E108B7-5221-43A3-9B2D-BA2C31BE721F |
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taxon LSID |
lsid:zoobank.org:act:E1E108B7-5221-43A3-9B2D-BA2C31BE721F |
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treatment provided by |
Plazi |
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scientific name |
Delavalia profunda |
| status |
sp. nov. |
Delavalia profunda sp. nov.
( Figs. 2–6 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 )
urn:lsid:zoobank.org:act:E1E108B7-5221-43A3-9B2D-BA2C31BE721F
Type locality. Off San Pablo Bay , Baja California Sur (Eastern Tropical Pacific), Mexico; Talud XV cruise, sampling station 24 (27.1181°N, 114.6008°W); depth 1,039 m; organic carbon content, 3.26%; organic matter content, 5.60%; sand 35.53%; clay, 7.95%; silt, 56.52 GoogleMaps %.
Specimens examined. Adult female holotype dissected and mounted onto seven slides (EMUCOP-020812- 03); August 1, 2012; coll. S. Gómez.
Etymology. The specific epithet from the Latin profunda , deep, makes reference to the depth at which the species was found. It is in the nominative singular. Gender feminine.
Description of female. Total body length measured from tip of rostrum to posterior margin of caudal rami, 462 µm; habitus pyriform, widest at posterior end of cephalothorax, tapering posteriad; cephalothorax/body length ratio, 0.32.
Prosome consisting of cephalothorax with fused first pedigerous somite, and second to fourth free pedigerous somites. Cephalothorax about as long as wide; hyaline fringe broad and smooth. Free pedigerous somites without expansions laterally nor dorsally; without spinular ornamentation; integument smooth, weakly sclerotized; hyaline fringe of second and third pedigerous somites broad and smooth, of fourth pedigerous somite visibly narrower; width of second to fourth pedigerous somites decreasing progressively, with few surface sensilla.
Urosome ( Fig. 2A–B View FIGURE 2 ) consisting of fifth pedigerous somite (first urosomite), genital double-somite (genital— second urosomite—and third urosomites fused), two free urosomites, and anal somite. Urosomites without expansions laterally nor dorsally; integument weakly sclerotized.
Fifth pedigerous somite ( Fig. 2A View FIGURE 2 ) visibly narrower than preceding somites; with short dorsolateral spinular row.
Second and third urosomites completely fused dorsally and ventrally forming genital double-somite ( Fig. 2B View FIGURE 2 ), with dorsolateral trace of division ( Fig. 2A View FIGURE 2 ); genital double-somite as long as wide, widest part measured in anterior fourth close to P6; proximal half with dorsolateral sensilla and spinular rows close to original posterior margin of genital somite, distal half with fewer dorsolateral sensilla and comparatively longer spinular rows ( Fig. 2A View FIGURE 2 ); proximal half without surface ornamentation ventrally, distal half with two ventral sensilla close to posterior margin ( Fig. 2B View FIGURE 2 ); posterior hyaline fringe broad and smooth ( Fig. 2A View FIGURE 2 ); genital complex hardly distinguishable, copulatory pores not exposed, paired genital apertures located ventrolaterally and covered by P6 ( Fig. 2B View FIGURE 2 ).
Fourth urosomite ( Fig. 2A–B View FIGURE 2 ) as distal half of genital double-somite.
Fifth urosomite without sensilla, with few dorsolateral spinules ( Fig. 2A View FIGURE 2 ); ventrally without spinular ornamentation ( Fig. 2B View FIGURE 2 ).
Anal somite three times as wide as long ( Fig. 2A View FIGURE 2 ); with spinules around joint of caudal rami dorsally ( Fig. 2A View FIGURE 2 ) and ventrally ( Fig. 2B View FIGURE 2 ); with medial cleft ventrally; anal operculum smooth, semicircular, flanked by one sensillum on each side ( Fig. 2A View FIGURE 2 ).
Caudal rami elongate, about 5.2 times as long as wide ( Fig. 2A–B View FIGURE 2 ) and about 3 times as long as anal somite; with outer spinules at base of seta II, and with inner subdistal spinules ( Fig. 2A–B View FIGURE 2 ), seemingly without pores; with six elements ( Fig. 2A–B View FIGURE 2 ); seta I absent; seta II subdistal, issuing close to outer distal corner, seta III subdistal, arising ventrally, both setae subequal in length; setae IV and seta V distal; seta VI issuing at inner distal corner; dorsal seta VII triarticulate at base, situated subdistally close to inner margin.
Rostrum ( Fig. 3A View FIGURE 3 ) trapezoidal, not fused to cephalothorax, reaching distal margin of second antennulary segment, bifid, with two subdistal sensilla, without dorsal pore.
Antennule ( Fig. 3A View FIGURE 3 ) eight-segmented; all segments smooth, except for proximal spinular row on first segment, the latter without pore. All setae smooth; seemingly without setae with fracture plane; eighth segment with two articulated seta.Armature formula: 1(1); 2(11); 3(7); 4(5 + (1 + ae)), 5(3); 6(4); 7(3); 8(5 + acro).Acrothek consisting of two setae and one minute aesthetasc fused basally.
Antenna ( Fig. 3B View FIGURE 3 ). Coxa short, with some outer spinules. Allobasis as long as free endopodal segment; with two rows of inner spinules proximally; with one abexopodal seta arising midway inner margin. Free endopodal segment elongate; proximal half with longitudinal row of inner spinules, with subdistal outer strong spinules, with two outer subdistal frills; lateral armature composed of two spines and two setae; distal armature composed of one inner pinnate geniculate apical element, three apical pinnate geniculate setae and one slender element, and one outer distal pinnate geniculate element fused basally to slender seta. Exopod three-segmented; first and third segments longest, with spinules as shown, middle segment short without spinules; first and second segment with one distal seta each, third segment with one proximal and three apical setae, two of which seemingly fused basally.
Mandible ( Fig. 4A View FIGURE 4 ). Coxa relatively short. Gnathobase wide; ventrodistal corner produced into small sharp semi-hyaline process; with three strong and several smaller teeth, one spine and two setae. Basis elongate, with narrow base; with small spinules proximally, medially and subdistally; with three subdistal outer setae. Exopod arising from short pedestal, one-segmented, elongate, about 3.6 times as long as wide, and 0.3 times as long as basis; with three lateral and three apical setae, none of which fused basally. Endopod recurved, twisted over exopod; with three lateral setae, and five distal elements (three slender setae, one of which spinulose and one strong element, and longest element fused to endopod basally and with hyaline flange in middle part).
Maxillule (badly damaged, not shown). Arthrite of praecoxa with two surface setae and some dorsal spinules proximally; distal armature difficult to define, but seemingly with seven distal spines/setae, one spinulose dorsal spine, and one lateral spinulose recurved seta. Coxal endite with three setae; spinular ornamentation difficult to see. Basis with two endites; proximal endite with four, distal endite with three slender setae. Exopod and endopod fused basally, but separated from basis, one-segmented; endopod larger than exopod, with four setae; exopod small, with two setae.
Maxilla ( Fig. 4B View FIGURE 4 ). Large syncoxa with outer spinules as shown; with three endites; proximal endite bilobed, proximal lobe with one slender element, distal lobe with two spinulose setae; middle and distal endites elongate, the latter slightly longer, with two spinulose and one slender seta each. Basis drawn out into strong claw, additionally with strong spine and two slender setae, one of which arising from elongate setophore. Endopod one-segmented, 1.2 times as long as wide, with six slender setae (one arising basally, two medially, and three apically).
Maxilliped ( Fig. 4C View FIGURE 4 ) subchelate. Syncoxa rectangular, about 1.5 times as long as wide; with few inner spinules; with one bare and two spinulose strong elements, of which bare seta and one spinulose element at the same level, the other arising distally from long pedestal. Basis slightly shorter than syncoxa, oval, with some outer spinules, with one anterior and one posterior inner spinular row as depicted, with two slender distal setae subequal in length. Endopod one-segmented, with one claw-like element and one seta.
P1 ( Fig.5A View FIGURE 5 ).Intercoxal sclerite (not shown) transversely elongate, nearly straight, without surface ornamentation. Coxa massive, 1.5 times as wide as long; with two anterior and one posterior row of outer spinules, with one medial row of subdistal spinules, and with slender long inner spinules proximally. Basis with slender inner spinules, with stronger and shorter spinules between rami and at base of outer spine; outer and inner spines seemingly bare. Exopod three-segmented, visibly longer than endopod; no pores detected on exopodal segments; EXP1 longest, EXP3 shortest; all segments without outer nor inner acute distal processes; EXP1 and EXP2 with longitudinal row of outer spinules; EXP1 with, EXP2 without inner setules; EXP1 without, EXP2 with inner seta; EXP3 with spinules at base of outer element, with two outer spines and two apical setae. Endopod two-segmented; segments without inner nor outer acute distal processes; no pores detected on endopodal segments; ENP1 reaching tip of EXP1, 1.4 times as long as wide, visibly longer than ENP2, with outer and distal spinules, with one inner seta; ENP2 small, rectangular, about 1.5 times as long as wide, and 0.6 times as long as ENP1, with small outer and distal spinules, with three distal setae, of which innermost slightly displaced inwards and medial seta longest and strongly plumose.
P2–P4 ( Figs. 5B View FIGURE 5 , 6A–B View FIGURE 6 ). Intercoxal sclerite (not shown) not transversely elongate, trapezoidal, with strong pointed process on distal outer corners, without surface ornamentation. Coxa with outer spinules proximally and subdistally, of P2 with, of P3 and P4 without inner spinules. Basis with outer seta, with strong acute process between rami and at inner distal corner, the latter larger, of P2 largest, of P4 smallest, with inner spinules medially. Exopod three-segmented, of P2 reaching tip of ENP2, of P3 reaching distal third of ENP3, of P4 slightly longer than ENP; EXP1 and EXP2 with outer acute distal process, with longitudinal row of outer spinules, and with inner distal frill, with inner seta; EXP3 seemingly without conspicuous distal processes, with few outer spinules proximally, with three outer spines and two apical setae, of P2 with two, of P3 and P4 with three inner setae. Endopod threesegmented, of P2 and P3 longer than, of P4 shorter than EXP; no pores detected on endopodal segments; segments of P2 and P3 subequal in length, in P4 ENP3 longest; ENP1 and ENP2 with outer acute and inner small distal process, outer process of ENP2 visibly longer, ENP3 with distal processes as shown; ENP1 with inner element, of P2 a slender short seta, of P3 and P4 a long stiff element with inner margin pinnate; ENP2 with two (P2) or one inner seta (P3 and P4); ENP3 with one apical outer spine, two apical elements, and one (P2), three (P3) or two (P4) inner setae.
Setal formula of swimming legs as follows:
P5 ( Fig. 2C View FIGURE 2 ). Baseoendopod pentagonal; endopodal lobe poorly-developed, with four setae, of which outermost shortest and set closely to adjacent seta, innermost seta spinulose. Exopod oval, with six setae, of which medial shortest.
P6 ( Fig. 2B View FIGURE 2 ) represented by a minute flap covering ventrolateral genital aperture, fused to somite, without surface ornamentation, with one slender seta.
Male. Unknown.
Variability. No variability was detected in the single female found in the sediment samples.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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