Austroniscus obscurus Kaiser & Brandt, 2007, sp. nov.

• Published in: Ecological Modelling
• Main Authors: Kaiser, Stefanie, Brandt, Angelika
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2007
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Nannoniscidae; Austroniscus; Austroniscus obscurus; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.5688739; http://treatment.plazi.org/id/038087A10A14651571899DA85417FEB7

Austroniscus obscurus sp. nov. (Figs 6–9) Material examined Holotype : 1 Ψ (adult, 1.9 mm), eastern Weddell Sea, 71°18.61`S, 013°56.12`E – 71°18.73`S, 013°56.12`E, PS ANT XXI/2, Station 232–1, 910– 899.6 m, ZMH K–40994. Paratypes : 3 Ψ (2 preparatory, 1 damaged), ZMH K–40995, 1 Ψ (SEM specimen), preparatory, ZMH K– 40996, same station as holotype. Diagnosis Pereonite 1 strongly frontally directed, with a spine­like appendix inserting ventrally, tipped with a small spine and almost reaching anterior margin of the cephalothorax. Posterior half of cephalothorax half covered by pereonites 1–2. Incisor of right mandible with 6 teeth, left mandible with 5 teeth. Lacinia mobilis with 3 teeth. Unguii of pereopods 5 and 7 with 1–2 robust ventral spines proximally. Description Habitus of female holotype (Figs 6 A, 9A–B) similar to A. chelus sp. nov. Antennula length (Fig. 6 B) 0.2 times body length, with 6 articles. Article 1 broad, 1.4 times longer than wide, with 3 broom setae (one broken off) and 3 slender simple setae of varying size. Article 2 as long as first, 3.7 times longer than wide; with 4 long broom setae and 2 small simple setae distally. Articles 3–4 about 1.5 times longer than wide, with 1–2 small simple setae distally. Article 5 elongated, 4 times longer than wide. Article 6 as long as article 3, with 2 long and 2 somewhat shorter simple setae terminally. Antenna (Fig. 6 C) long and slender, almost as long as body. Peduncular articles 1–4 short; article 3 with a large spine almost as long as article 4. Peduncular articles 5–6 long and slender; article 5 about 5.3 times longer than wide, with some short setae and 2 robust setae laterally, with 1 broom seta and 2 simple setae of varying size distally. Article 6 about 8.3 times longer than wide, with some short setae and 1 small seta laterally, with 5 broom setae and 5 simple setae of varying size distally. Distal 21 flagellar articles tapering in width and length distally. Flagellar article 1 longest, length 0.25 times peduncular article 6 length, 3.7 times ...