Hebefustis clareolithis Kaiser, 2008, sp. nov.

• Main Author: Kaiser, Stefanie
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Nannoniscidae; Hebefustis; Hebefustis clareolithis; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.5670990; http://treatment.plazi.org/id/530887A4E066FFD39DEA5F78FA5AFBC7

Hebefustis clareolithis sp. nov. (Figs 1–5) Material examined Holotype : female, (preparatory, 1.9 mm), eastern Weddell Sea, 70°31.08'S – 70°32.23'S, 14°34.82'W – 14°34.90'W, PS ANT XXII/3, Station 81–8, 4382 m, 24.02.2005, ZMH K–41261. Paratypes : 9 females (7 preparatory, 1 juvenile, 1 damaged), 1 male (juvenile), same station as holotype, ZMH K–41262; 1 male (adult, 1.4 mm), same station as holotype, ZMH K–41263. Diagnosis. Pereonite 2 with a robust spine on anterolateral margins. Pereonites 6 and 7 with acute, distally directed posterolateral margins. Second article of antennula with 4 broom setae distally. Antenna with 12 flagellar articles. Posterolateral spines well developed and acute, halfway along margin. Pleopod 1 widest distally. Description. Habitus of female holotype (Figs 1 A–C): Body dorsoventrally slightly flattened and broadened, 3.7 times longer than wide. Surface of dorsal cuticle with numerous setules (Fig. 2 H). Ventral surface alveolarly structured (Fig.1 B). Coxae not visible in dorsal view. Pereonites 1–3 with frontally directed laterofrontal margins. Pereonite 1 and 2 nearly of same length and width, p ereonite 2 widest, 4 times longer than wide, with a robust spine anterolaterally. Pereonite 4 longest, nearly twice as wide as long. Pereonites 1–4 decreasing, pereonites 5–7 increasing in width distally. Body gradually flattening from pereonites 1–4 and slightly increasing in height from pereonites 5–7. Pereonites 6 and 7 medially fused, with acute, distally directed posterolateral margins and 2 ventral depressions. Pleotelson 0.23 times body length, as long as wide, width 0.9 times pereonite 2 width, with well-developed posterolateral spines, halfway along margin. Posterior margin strongly convex, anterior dorsal margin straight. Anus (Fig. 1 B) covered by anus valves laterally. Uropods inserting closely to the anus valves, short in relation to pleotelson, hardly projecting above posterior margin. Operculum about 0.6 times pleotelson length (ventrally measured). Cephalothorax (Fig. 1 A, ...