Prodoroixys antarctica 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; Prodoroixys; Prodoroixys antarctica; Antarctic; The Antarctic; Kerguelen; Kerguelen Islands; Antarc*; Antarctica
• Online Access: https://zenodo.org/record/5699915; https://doi.org/10.5281/zenodo.5699915

Prodoroixys antarctica gen. et sp. nov. (Figs. 336, 337) Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21384), paratypes (5 intact ♀♀, MNHN-IU-2014-21385), and dissected paratypes (2 ♀♀, figured) from Synoicum salivum Monniot F. & Gaill, 1978 (MNHN-IT-2008-8621 = MNHNA 1/ SYN /28), Kerguelen Islands, MD 04 DR106 (49°00’18″S, 67°30’42’’E), “Marion Dufresne”, depth 206 m, Boury-Esnault coll., 01 March 1975. Additional material. 13 ♀♀ (MNHN-IU-2018- 1906) and 1 dissected ♀ from Synoicum sp., Kerguelen Islands, MD 04 DR 106; 17 ♀♀ (MNHN-IU-2018- 1907) from Aplidium sp., Kerguelen Islands, MD 03 Pr 61; 14 ♀♀ (MNHN-IU-2018-1908) from Synoicum sp., Kerguelen Islands. MD 04 DR 106. Etymology. The specific name of the new species refers to its distribution in the Antarctic. Descriptionoffemale. Body (Fig. 336A) similarto typical Doroixys, 1.09 mmlong. Prosome 0.89 mmlong, relatively narrow; dorsal cephalicshielddistinctly defined, with acutely pointed posterolateral horn-like process on each side. Metasome unsegmented, distinctly longerthan wide, graduallybroadeningposteriorly; fifthpedigerous somite completely fused with fourth. Freeurosome (Fig. 336B) 5-segmented: genital somite distinctly longer and wider than abdominal somites. Surface of abdominal somites densely ornamented with setules. Caudal ramus (Fig. 336C) about 2.3 timeslongerthan wide (68×30 μm) and as long as anal somite; ornamented with numerous setules: armed with 6 setae, 2 proximal setae positioned at 46% and 60% of ramus length; 4 distal setae blunt at tip; all caudal setae shorter than ramus width. [table omitted] Rostrum (Fig. 336D) 100×74 μm, tapering, setulose distally, slightly constricted at proximal third; apex rounded. Antennule (Fig. 336E) 154 μm long, 9- segmented; third segment with traces of 2 articulations; armatureformula 2, 17, 5, 3+aesthetasc, 3, 2+aesthetasc, 2, 2+aesthetasc, and 7+aesthetasc; setae crowded, all naked. Antenna (Fig. 336F) 4-segmented; proximal 3 segments shortand unarmed, terminal (secondendopodal) segment ...