Schizoproctus magnus Kim & Boxshall 2021, sp. nov.

• Main Authors: Kim, Il-Hoi, Boxshall, Geoff A.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Cyclopoida; Ascidicolidae; Schizoproctus; Schizoproctus magnus; Antarctic; Seta; Terre Adélie; Terre-Adélie; Antarc*
• Online Access: https://zenodo.org/record/5047109; https://doi.org/10.5281/zenodo.5047109

Schizoproctus magnus sp. nov. (Figs. 65, 66) Type material. Holotype ♀ (MNHN-IU-2018-1976, dissected and mounted on 2 slides) from myura bçuvetensẚs Michaelsen, 1904 (MNHN-IT-2008-7430 = MNHN S2 / PYU/450); Antarctic, Terre Adélie, CEAMARC cruise, RV “Aurore Australis”, Stn 31EV268 (66°35´S, 145°01´E), depth 429-451 m, IPEV-AAD-MNHN coll., 03 January 2008. Etymology. The specific name is derived from the Latin magn (=large), referring to the large body size. Description of female. Body (Fig. 65A, B) large, slender, 4.88 mm long; maximum width 1.03 mm. Anterior part of body unsegmented, with weak constriction dorsally and laterally between cephalosome and remaining part; legs 5 directed laterally, perpendicular to body axis. Posterior part of body narrower and slightly shorter than anterior part, not articulated from anterior part, gradually narrowing posteriorly, consisting of genital and abdomen of 6 annulations; annulations indistinct or separated by constrictions. Caudal ramus (Fig. 65C) as long as wide (120×120 μm), armed with 4 claws and 2 small setae; claws shorter than ramus, 2 shorter, outer distal claws bluntly tipped, 1 rudimentary. Rostrum (Fig. 65D) small, semicircular with rounded apex. Antennule (Fig. 65D) 417 μm long, 5-segmented; armature formula 12, 6, 3, 4, and 7; first segment much broader than other segments; setae small, much shorter than width of first segment. Left antenna (Fig. 65E) 4-segmented; coxa, basis, and first endopodal segment unarmed; second endopodal segment about 3.3 times longer than wide (92×28 μm), slightly shorter than basis, armed with 8 bluntly tipped, smooth setae. Right antenna as for left, but second inner seta on distal margin of second endopodal segment (Fig. 65F) longer than that of left antenna. Labrum weak, semicircular, with rounded posterior margin. Mandible (Fig. 65G) with 3 teeth on coxal gnathobase, distalmost tooth finely spinulose along proximal margin; palp with 9 setae arranged as 3, 1, 1, 2, and 2. Maxillule (Fig. 65H) consisting of precoxa and palp: ...