Schizoproctus fusiformis 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; Schizoproctus; Schizoproctus fusiformis; Tromsø
• Online Access: https://doi.org/10.5281/zenodo.5047115; http://treatment.plazi.org/id/3729879BFF89FF98FA93FA7AD0AC1ED7

Schizoproctus fusiformis sp. nov. (Figs. 69, 70) Type material. Holotype ♀ (MNHN-IU-2018-1978, dissected and mounted on a slide) from mçlycarpa fẚbrçsa (Stimpson, 1852); off Tromsø, Norway, NORBI Cruise, RV “Jean Charcot”, Stn CP 11 trawl, (69°52’N, 17°08’E), depth 250-300 m, Bouchet & Warén coll., 01 July 1975. Etymology. The specific name refers to the fusiform anterior part of body of the new species. Description of female. Body (Fig. 69A) straight, with fusiform anterior part and narrower posterior part; body length 1.40 mm. Anterior part 800×440 μm, not segmented, but cephalosome and 4 metasomal somites discernible by weak cephalic shield and 4 dorsal tergites. Fifth pedigerous somite not defined from fourth pedigerous somite. Posterior part of body consisting of genital somite and 4-segmented abdomen. Genital somite 250×220 μm, gradu- ally narrowing posteriorly; genital apertures positioned dorsally. Four abdominal somites 82×131, 90×118, 77×105, and 122×98 μm, respectively. Caudal ramus (Fig. 69B) wider than long, armed with 4 spines and 1 seta; outer distal spine very small, nipple-shaped, not articulated from ramus. Rostrum absent. Antennule (Fig. 69C) short, 5-segmented; first segment broad; distal segments gradually narrowing; armature formula 12, 5, 3, 4, and 7+aesthetasc. Antenna (Fig. 69D) 4-segmented; coxa, basis, and first endopodal segment unarmed; second endopodal segment about 4 times longer than wide (95×24 μm), with partial subdivision on inner side at distal third; armed with 8 spines (4 on inner margin and 4 on distal margin); spines on inner margin shorter than width of segment; longest second outer spine on distal margin 65 μm long, twice as long as second longest adjacent spine. Labrum (Fig. 69E) weak, thin-walled, strongly tapering towards rounded distal margin. Mandible (Fig. 69F) with 3 teeth on coxal gnathobase; palp with 9 setae and 1 large medial swelling; 3 outer proximal setae pinnate, but remaining distal setae naked. Maxillule (Fig. 69G) consisting of precoxa and palp; ...