Prodoroixys bathybia, Kim & Boxshall, 2020
publication ID |
https://doi.org/ 10.11646/megataxa.4.1.1 |
DOI |
https://doi.org/10.5281/zenodo.5699919 |
persistent identifier |
https://treatment.plazi.org/id/03C487CB-EEAC-3BC8-FF4D-FE54FC9BFBBE |
treatment provided by |
Plazi |
scientific name |
Prodoroixys bathybia |
status |
gen. et sp. nov. |
Prodoroixys bathybia gen. et sp. nov.
( Figs. 338 View FIGURE 338 , 339 View FIGURE 339 )
Coxa Basis Exopod Endopod | ||||
---|---|---|---|---|
Leg 1 | 0-0 | 1-I | I-1; I-1; III, 1, 4 0-1; 0-1; 1, 2, 2 | |
Legs 2 & 30-0 | 1-0 | I-1; I-1; III, I, 5 | 0-1; 0-1; 1, 2, 2 | |
Leg 4 | 0-0 | 1-0 | 1-1; 1-1; 2, 1, 5 | 0-1; 0-1; 0, 2, 2 |
Type material. Holotype ♀ (dissected and mounted on a slide, MNHN-IU-2014-21386 ) from unknown host, BIOGAS 4 DS63, Atlantic, Golfe de Gascogne, “ Jean Charcot ” (47°33’N, 08°35’W), depth 2126 m, IFREMER coll., 26 February 1974. GoogleMaps
Etymology. The specific name is derived from the Greek words bath (=deep) and bio (=life), referring to the discovery of the new species in the deep sea (2126 m).
Descriptionoffemale. Body ( Fig. 338A View FIGURE 338 ) small, not swollen; bodylength 875μm. Prosome675 μmlong:dorsal cephalic shield large, lacking posterolateral processes, but with posterolateral corners produced, nipple-shaped. First to fourth pedigerous somites discernible by 3 dorsal constrictions on metasome; fourth pedigeroussomite containing large eggs inside. Fifth pedigeroussomite not defined. Freeurosome ( Fig. 338B View FIGURE 338 ) 5-segmented: genital and 4 abdominalsomites 34×120, 47×119, 37×108, 28×94, and 51×81 μm, respectively. Caudal rami directed posteriorly, gently narrowing distally; each ramus ( Fig. 338C View FIGURE 338 ) about 4.2 times longer than wide (83×20 μm), and ornamented with thin setules mainly on outer surface: armedwith 6 setae (outer lateral, dorsal, and 4 subdistal), outer distal and dorsal setae positioned at 36 and 45% of ramus length; all setae naked and shorter than width of ramus at base.
Rostrum ( Fig. 338D View FIGURE 338 ) large, 70×44 μm, tapering evenly towards blunt apex. Antennule ( Fig. 338E View FIGURE 338 ) 130 μmlong, 9-segmented; armatureformula 2, 13, 6, 5, 3, 2+aesthetasc, 2, 2+aesthetasc, and 7+aesthetasc. Antenna ( Fig. 338F View FIGURE 338 ) stout, 4-segmented; proximal 3 segments unarmed; terminal segment about 2.5 times longerthan wide (37×15 μm) and as long as first endopodal segment: armedwith 8 setae (arranged as 1, 2, 2, and 3) plus terminal claw more than half length of segment.
Labrum ( Fig. 338G View FIGURE 338 ) withsetulose posteriormarginand posteromedial lobe. Mandible ( Fig. 338H View FIGURE 338 ) with broadened coxal gnathobasebearing 5 teeth and1 small seta: basiswith 1 setaonmedial margin: exopodwith 5 large, equal setae: endopod with 1 and 5 setae on first and second segments, respectively. Paragnath ( Fig. 338I View FIGURE 338 ) assmalllobe bearing 1 denticle apically and setules on medial margin. Maxillule ( Fig. 338J View FIGURE 338 ) armedwith 9 setae on arthrite, 1 each on coxal endite and epipodite, 2 on basis, 4 on exopod, and 3 on endopod. Maxilla ( Fig. 338K View FIGURE 338 ) 5-segmented; syncoxawith 3, 1, 2, and 3 setaeon first to fourth endites, respectively; basis with smooth claw plus 2 setae; endopod with 1, 1, and 4 naked setae on first to third segments, respectively. Maxilliped ( Fig. 339A View FIGURE 339 ) unsegmented, armedwith 10 setae (8 medial and 2 apical).
Legs 1–4 biramous with distinctly 3-segmented rami ( Fig. 339 View FIGURE 339 B-D). Innercoxalsetaabsentinlegs 1– 4. Exopodal segments of legs 1–3 bearing outer spines, but exopod of leg 4 with bluntly tipped setae. Armature formula for legs 1–4 as follows:
Leg 5 ( Fig. 338B View FIGURE 338 ) represented by 2 indistinct lobes of posteroventral margin of somite; inner exopodal lobe tipped with 2 setae and outer protopodal lobe with 1 seta.
Male. Unknown.
Remarks. The major differences between Prodoroixys bathybia gen. et sp. nov. and P. antarctica gen. et sp. nov. are the more slender caudal rami in the former, the presence of 5 setae on the second endopodal segment of the mandible (cf. 6 or 7 in the type species), 4 setae on the third endopodal segment of the maxilla (cf. 3 in the type species), 10 setae on the maxilliped (cf. 6 to 9 setae in the type species), the absence of an inner coxal seta on leg 1 (cf. present in the type species), and the different armature states of the posterior swimming legs.
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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