Pseudanthessius excertus Kim 2014, n. sp.

• Main Author: Kim, Il-Hoi
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2014
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Hexanauplia; Cyclopoida; Pseudanthessiidae; Pseudanthessius; Pseudanthessius excertus; Crassostrea gigas
• Online Access: https://doi.org/10.5281/zenodo.8134668; http://treatment.plazi.org/id/75578799FF87B606C5D8FDC9FAAEF82F

Pseudanthessius excertus n. sp. (Figs. 9, 10) Material examined. Six from polychaetes (mainly Hydroides ezoensis Okuda) epizoic on shells of the oyster Crassostrea gigas (Thunberg) attached to the wharf in Gangneung Port (37 46′15′′N, 128 57′08′′E), depth about 50 cm, 21 November 2012. Holotype (, NIBRIV 0000286631) and paratypes (3 32) have been deposited in the National Institute of Biological Resources (NIBR), Incheon. Dissected paratypes (2 Female. Body (Fig. 9A) rather small. Body length 945 Μm in dissected and figured paratype (in other 2 measured specimens 868 and 968 Μm). Prosome 584 Μm long. Cephalothorax 403 Μm, nearly globular, as dorsoventrally deep as wide, with weak dorsal suture delimiting cephalosome and first pedigerous somite. Second pedigerous somite broad, with prominent, tapering lateral projection on both side. Third and fourth pedigerous somite much narrower and shorter than second pedigerous somite, 240 and 154 Μm wide, respectively, with round lateral margins. Urosome (Fig. 9B) 5-segmented. Fifth pedigerous somite 117 Μm wide. Genital double-somite 140 132 Μm, slightly longer than wide, with broad lateral expansion, widest at 0.4 region of somite length and gradually narrowing posteriorly from widest region; genital aperture large and locating dorsally. Three free abdominal somites 37 72, 26 60, and 51 60 Μm, respectively. Anal somite twice as long as penultimate abdominal somite, with large anal region. Caudal ramus (Fig. 9C) 71 26 Μm (ratio 2.73: 1), slightly narrowing distally, with 6 setae; outer lateral seta (seta II) locating at 0.6 region of ramus length. [table omitted] Rostrum (Fig. 9D) stout, as long as wide; proximal half with parallel lateral margins and distal half strongly tapering, with rounded posterior apex. Antennule (Fig. 9E) 183 Μm long and 7-segmented; armature formula: 4, 13, 6, 3, 4+aesthetasc, 2+aesthetasc, and 7+aesthetasc; all setae naked. Antenna (Fig. 9F) 4-segmented; last segment 33 Μm (ratio 1.65: 1); armature formula: 1, 1, 2+claw, and 3+4 claws; claws ...