Ascidicola antarctica Kim & Boxshall 2021, sp. nov.

• Main Authors: Kim, Il-Hoi, Boxshall, Geoff A.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Cyclopoida; Ascidicolidae; Ascidicola; Ascidicola antarctica; Antarc*; Antarctic; Antarctic Ocean; Antarctica
• Online Access: https://doi.org/10.5281/zenodo.10530905; http://treatment.plazi.org/id/3729879BFFEBFFE5FA93F995D63A1DA7

Ascidicola antarctica sp. nov. (Figs. 6, 7) Type material. Holotype ♀ (MNHN-IU-2018-1942, dissected and mounted on a slide) from Cçrella antarctẚca Sluiter, 1905; Antarctic Ocean, Eltanin cruise 12, Stn 1078 (61°26´S, 41°55.4´W), depth 604 m, 12 April 1964. Etymology. The name of the new species refers to its distribution in the Antarctic Ocean. Description of female. Body (Fig. 6A, B) elongate, cylindrical, segmented as in congeners. Body length 2.56 mm. Prosome slightly depressed; maximum width 560 μm across fourth pedigerous somite. Prosome 1.08 mm long, occupying 41% of body length, gradually broadening distally; cephalosome 351×425 μm; first to fourth pedigerous somites 68×431, 154×480, 203×505, and 283×560 μm, respectively. Urosome 5-segmented; fifth pedigerous somite about 220×440 μm, genital somite (Fig. 6C) 1.40 times longer than wide (578×412 μm); small copulatory pore visible on proximal ventral surface. Three abdominal somites 265×302, 154×252, and 185×197 μm, respectively; ventral spinose pad absent between last 2 abdominal somites. Caudal ramus (Fig. 6D) 2.53 times longer than wide (81×32 μm), 0.44 times as long as anal somite, with slightly convex inner margin: armed with 6 small setae (1 lateral and 5 distal); lateral seta positioned at 47% of ramus length; largest of distal setae 47 μm long, 0.58 times as long as caudal ramus, all other setae shorter than width of ramus at base. Rostrum absent. Antennule (Fig. 6E) short, 5-segmented; all segments wider than long; armature formula 5, 8, 5, 5+aesthetasc, and 12+3 aesthetascs; all setae naked; shorter setae usually broadened; aesthetascs small. Antenna (Fig. 6F) 3-segmented, consisting of coxobasis and 2-segmented endopod; basis slightly longer than wide (50×47 μm) armed with 1 large spine (45 μm long) distally and ornamented with several scattered rows of spinules; first endopodal segment about 1.6 times longer than wide (38×24 μm), armed with 1 element (only insertion scar was observed) and 2 rows of spinules; second endopodal segment 3.5 times ...