Antennuloniscus ornatus Menzies 1962

• Published in: Frontiers in Marine Science
• Main Author: Brökeland, Wiebke
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Haploniscidae; Antennuloniscus; Antennuloniscus ornatus; Menzies; Scotia Sea
• Online Access: https://doi.org/10.5281/zenodo.6261608; http://treatment.plazi.org/id/03D7642C697EFF8F3052FC762B7DFBE9

Antennuloniscus ornatus Menzies, 1962 (Figs 1 A, 2–7) Material Holotype: American Museum of Natural History, New York, AMNH 12004, ɗ, 2.0 mm, V­14­23, archipelagic apron of Menzies Seamount, southwest of South Georgia, eastern Scotia Sea, Atlantic, 55°29’S 37°57’W, 3770 m depth. Type in good condition, pleopod 1 dissected. ANDEEP material: Station 42­2, 59°40.30–40.32’S 57°35.42–42.64’W, 3689 m: 2 ɗ, 2.1 and 2.2 mm; 5 Ψ, 1.9–2.3 mm; 1 ovigerous Ψ, 2.0 mm; 1 juvenile, 1.1 mm long; ZMH K­ 40723. Station 43­8, 60°27.13–27.19’S 56°05.12–04.81’W, 3962 m depth: 1 ɗ, 2.0 mm; 1 Ψ, 1.9 mm; ZMH K­ 40724. Diagnosis Body broadly oval, length 2.0 width. Head length 2.1 width, frontal margin convex. Of pleotelson in males anterior margin width 1.8 posterior margin, posterolateral processes short, not reaching terminal margin. Antenna peduncular article 3 with small blunt dorsal tooth, longitudinal groove distinct, flagellum almost as long as articles 5 and 6, with 8 articles. Carpus of pereopods 5–7 with numerous long simple setae ventrally. Pleopod 1 length 1.7 times width, broadest part in the proximal fifth, greatest width 2.2 narrowest width. Pleopod 2 protopod length 1.9 width; endopod length 0.8 protopod length, sperm duct reaching from endopod tip almost to proximal third of article 2. Description of male (ANDEEP specimen) Body (Fig. 2): Margins of pereonites rounded, smooth; pereonite 5 widest. Pleotelson length 0.2 body length, tapering slightly distally; lateral margins slightly convex, serrated, with numerous setae (broken off in illustrated specimen); terminal margin with median convex extension bearing the anus; dorsal surface with 2 rounded longitudinal ridges, ventral surface with faint cuticular suture line surrounding branchial chamber. Cuticle of body, pleopods 1 and 2, maxillipedal epipod and peduncular articles of antenna with numerous small round depressions (Fig. 3 G). Antennula (Fig. 2) length 0.2 body length, article 1 broadest, about length 1.4 width, article 2 slightly shorter, about half as wide as ...