Prodoroixys bathybia, Kim & Boxshall, 2020

Kim, Il-Hoi & Boxshall, Geoff A., 2020, Untold diversity: the astonishing species richness of the Notodelphyidae (Copepoda: Cyclopoida), a family of symbiotic copepods associated with ascidians (Tunicata), Megataxa 4 (1), pp. 1-6 : 510

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.

Kingdom

Animalia

Phylum

Chordata

Class

Ascidiacea

Order

Enterogona

Family

Didemnidae

Genus

Prodoroixys

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