Haploniscus astraphes Brökeland & Svavarsson, 2017, n. sp.

• Main Authors: Brökeland, Wiebke, Svavarsson, Jörundur
• Format: Other/Unknown Material
• Language: unknown
• Published: 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Haploniscidae; Haploniscus; Haploniscus astraphes; Greenland; Seta; Denmark Strait; Iceland; North Atlantic
• Online Access: https://zenodo.org/record/6008812; https://doi.org/10.5281/zenodo.6008812

Haploniscus astraphes n. sp. (Figs 1–9) Holotype: DIVA2- HA307, male stage V, 1.01 mm, RV Meteor, M 63/2, DIVA 2 expedition, EBS station 89-6, 0°42.95’N, 5°31.29’W, 5142 m, Guinea Basin, southeast Atlantic, ZMH K-42450. Paratypes: DIVA2- HA308, 1 manca stage III, same locality as holotype, ZMH K-42451; DIVA 2 -HA515, 1 male stage V, 1.04 mm, DIVA2-HA414, 1 female stage IV or V, 1.06 mm, DIVA2- HA415, 1 manca stage III, 0.92 mm, EBS station 90-7, 0°40.49’N, 5°29.71’W, 5142 m, Guinea Basin, ZMH K-42502; DIVA 2 - HA153, 1 female stage IV or V, 1.24 mm, EBS station 45-3, 9°53.76’S, 0°53.60’E, 5657 m, Angola Basin, ZMH K-42503. BIOICE station 2909, RV Bjarni Saemundsson, North Atlantic: 2 females stage IV or V, 1.25 and 1.09 mm, RP sled, 65°15.61’N, 28°50.15’W, 1300 m, 25 August 1996, 3.96°C, Denmark Strait, south of Greenland-Iceland Ridge, IMNH 10370. Etymology. The Greek astraphes, “straight”, refers to the straight outlines of head and pereon in this species. Diagnosis. Body rectangular. Head rectangular in males, trapezoidal in females. Vertex straight, without rostrum. Clypeus slightly prolonged, dorsally keeled. Pleotelson terminal margin strongly convex. Antenna 2 peduncular article 1 small, article 3 with long tooth, curved backwards, articles 5 and 6 short, not fused, article 6 with strong apical projection, flagellum small with 8–9 articles. Mandibular palp article 3 with 6 pectinate setae. Maxilliped with 2 retinaculae. Outer apical comb on carpus of pereopods 4–6 composed of large spines, much larger than inner comb; dorsal sensory stout seta on carpus of pereopod 7; distalmost ventral scale on propodus drawn out towards dactylus. Pleopod 2 of males with short stylet of the endopod, operculum of females nearly circular. Pleopod 3 exopod with 3 simple setae. Uropods stout, ramus length about 1.8 width. Description of male (stage V). Body (Fig. 1) length 3.3 width, rectangular, lateral margins nearly parallel. Head length 0.7 width, rectangular; vertex straight, without rostrum; anterolateral margins slant ...