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

• Main Authors: Kim, Il-Hoi, Boxshall, Geoff A.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Ascidiacea; Enterogona; Didemnidae; Notoixys; Notoixys hirsuta; Antarctic; South Orkney Islands; Seta; Orcadas; Antarc*
• Online Access: https://zenodo.org/record/6422131; https://doi.org/10.5281/zenodo.6422131

Notoixys hirsuta gen. et sp. nov. (Figs. 342, 343) Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21389), paratypes (6 intact ♀♀, MNHN-IU-2014-21390), and dissected paratypes (2 ♀♀, figured) from Aplidium imbutum Monniot C. & Monniot F., 1983, South Orkney Islands, Cruise876,Antarctic,“Islas Orcadas ”,(60°27.8’S, 46°23.1’W), depth 93-102 m, trawl, 16 February 1976. [table omitted] Etymology. The specific name refers to the hirsute body of the new species. Descriptionoffemale. Body (Fig. 342A) swollen, 1.20 mmlong. Prosome 0.91 mmlong; dorsalcephalic shield expanded ventrolaterally, surface densely setulose along ventral border, with paired acutely-pointed posterolateralhorn-likeprocesses (Fig. 342B). Metasome almost spherical, without trace of articulation, slightly longerthanwide. Freeurosome (Fig. 342C) 5-segmented: genital somite much wider than long: 4 abdominal somites setulose on ventral surface, 124×160, 67×127, 44×104, and 58×96 μm, respectively. Caudalramus (Fig. 342D) small, setulose, slightly tapering distally, about 2.0 times longer than wide (43×21 μm); caudal setae not discernible from setules. Rostrum (Fig. 342E) about 1.2 timeslongerthan wide, densely covered with setules, tapering to blunt apex. Antennule (Fig. 342F) narrow, 147 μmlong, indistinctly 7-segmented; second to fourth segments each bearing 1 or 2 incomplete subdivisions on posterior surface; armature formula 2, 14, 8, 3+aesthetasc, 1, 4, and 5+aesthetasc. Antenna (Fig. 342G) 4-segmented; proximal 3 segments unarmed; terminal segment about 3.4 times longer than wide (57×17 μm) and distinctly longerthan first: armed with 9 setae (arranged as 1, 3, 2, and 3) plus small terminal claw, about 0.3 times as long as segment. Labrum (Fig. 342H) withlarge posteromedian protuberance bearing setules along posterior margin. Mandible (Fig. 342J) with narrow coxalgnathobase bearing 6 unequalteeth on medial margin: basis with 1 seta onmedial margin: exopodwith 5 setae; outerdistalseta short, about half as long as adjacent seta: endopod with 1 and ...