Haplostomella bilobata 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; Haplostomella; Haplostomella bilobata; Kerguelen Islands
• Online Access: https://doi.org/10.5281/zenodo.10530934; http://treatment.plazi.org/id/3729879BFF4EFF47FA93F8B4D6461D8B

Haplostomella bilobata sp. nov. (Figs. 112, 113) Type material. Holotype ♀ (MNHN-IU-2014-21526), 2 ♀♀ paratypes (MNHN-IU-2014-21527), and 2 ♀♀, 1 ♂ paratypes (dissected, MNHN-IU-2014-17389) from Apl ẚdẚum sp.; Kerguelen Islands, no other collection data. Etymology. The specific name alludes to the presence of a pair of lobes on the labrum of the new species. Description of female. Body (Fig. 112A, B) eruciform, consisting of unsegmented anterior part and short abdomen. Body length 2.04 mm; maximum width 496 μm (across region of leg 4). Anterior half of body slightly tapering anteriorly; cephalosome narrower than metasome, incompletely defined from metasome by posterolateral margins of cephalic shield. Cylindrical metasomal region incorporating leg 5, with 5 pairs of small dorsolateral folds; last pair at level of leg 5 much smaller than anterior 4 pairs. Genital somite completely fused to metasome; paired genital apertures (Fig. 112L) positioned dorsolaterally. Genital operculum bearing 3 teeth inside. Abdomen (Fig. 112C) tapering, 3-segmented, but articulation incomplete between last 2 somites. Caudal ramus (Fig. 112D) about 2.9 times longer than wide (69×24 μm), slightly longer than anal somite, with 5 subequal, naked setae (1 lateral and 4 distal); lateral seta positioned at 63% of ramus length. Egg sac (Fig. 112B) 1.40× 0.34 mm; each egg about 115 μm in diameter. Rostrum absent. Antennule (Fig. 112E) 100 μm long, 2-segmented; proximal segment with 9 setae; distal seg- ment small, only 17 μm long, subdivided in middle, with 5 setae and 1 short aesthetasc; all setae naked. Antenna (Fig. 112F) indistinctly 2-segmented; proximal segment unarmed; distal segment with 1 seta on inner margin, 1 short, blunt seta plus 1 lobate process subdistally, and tipped with 1 seta. Labrum (Fig. 112G) short and broad, characteristically with pair of large lobes on posterior margin. Mandible and maxillule absent. Maxilla (Fig. 112H) distinctly 2-segmented; broad proximal segment unarmed; distal segment shorter and narrower than ...