Notoixys ovata Kim & Boxshall 2020, gen. et sp. nov.

• Main Authors: Kim, Il-Hoi, Boxshall, Geoff A.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Ascidiacea; Enterogona; Didemnidae; Notoixys; Notoixys ovata; Antarc*; Antarctic; Antarctic Ocean; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.5728085; http://treatment.plazi.org/id/03C487CBED553832FCEFF858FD79F84F

Notoixys ovata gen. et sp. nov. (Figs. 344, 345) Type material . Holotype ♀ (dissected and mounted on a slide, MNHN-IU-2014-21391) from Aplidium millari Monniot C. & Monniot F., 1994 (Type MNHN-IT-2008- 556 = MNHNA1/APL.B/295), EPOS 3 Stn 235, Weddell Sea, Antarctic Ocean (75°09.1’S, 27°34.7’W), depth 407 m, 31 January 1989. Etymology . The name is derived from the Latin ovat (=egg-shaped), referring to the ovate prosome of the new species. Descriptionoffemale . Body (Fig. 344A) straight, slightly depressed, 2.11 mm long. Prosome inflated, oval, 1.76 mm long: greatest width of prosome 1.25 mm, at posterior third. Cephalosome (Fig. 344B) short, defined from metasome; dorsal cephalic shield with paired lateral horn-like processes (Fig. 344C). Metasome lacking any trace of articulation. Free urosome (Fig. 344D) small, indistinctly 5-segmented; articulations between somites obscure, representedbyweakconstrictionsand faintsuture lines. Genital somite short, characteristically bearing short, broad hood-like flap of cuticle along posterodorsal margin (Fig. 344B). Caudalramus (Fig. 344E) small, shorter than anal somite and about 2.7 times longer than wide (82×31 μm), tapering in distal third, ornamented with several setules; caudal setae not distinguishable from setules. Rostrum (Fig. 344F) well-developed, longer than wide, slightly tapering proximally and strongly taperingdistally towards angular apex. Antennule (Fig. 344G) tapering, 225 μmlong, indistinctly 8-segmented; armatureformula 2, 15, 7, 3, 2, 2, 2, and 7+aesthetasc; third segment subdivided; all setae small, setule-like. Antenna (Fig. 344H) 4-segmented; proximal 3 segments unarmed; terminal segment (second endopodal segment) 2.7 timeslongerthan wide (68×25 μm) and longerthan firstendopodal segment: armedwith 7 setae (arranged as 2, 2, and 3) plus terminal claw half as long as segment. Labrum weak, easily damaged during dissection. Mandible (Fig. 344I) with 3 small teeth and short pectinate margin on coxal gnathobase: basis with broad setaon medial margin: ...