Astacilla frigida Stransky & Svavarsson & Poore & Kihara 2020, comb. nov.

• Main Authors: Stransky, Bente, Svavarsson, Jörundur, Poore, Gary C. B., Kihara, Terue Cristina
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Arcturidae; Astacilla; Astacilla frigida; Greenland
• Online Access: https://doi.org/10.5281/zenodo.4332819; http://treatment.plazi.org/id/650CEF24FFF5FFA6B3C7BE53FB33AA7C

Astacilla frigida (Hansen, 1916) comb. nov. (Figs 34–35) Arcturus hystrix.— Ohlin, 1901: 30, fig. 6a–r (non G.O. Sars, 1877). Pleuroprion frigidum Hansen, 1916: 196–197, pl. XV, fig. 7a–b.— Boone, 1920: 30–31.— Kussakin, 1982: 427–428, fig. 317. Material examined: Syntypes , ZMUC-CRU-6464 (1 adult female), ZMUC-CRU-9401 (1 juvenile male), ZMUC- CRU-9402 (1 adult female, 1 juvenile male, 1 adult male), ZMUC-CRU-9403 (1 male, 1 Manca II stage, 4 females), all from 72°53´N, 20°36´W. Other material. ZMH-K-39770 (1 specimen, male, 8.5 mm length, ARK IX/2, station 179, Northeast Water Polynya, off Greenland). Diagnosis: Body of females with many long and narrow, bluntly pointed spines, spines forming neat row across each pereonite; five rows of spines across pereonite 4, additionally pair of spines between first and second row; pereonite 4 0.3 times body length, anteriorly paralell, narrowing posteriorly; 5.9 times longer than third pereonite; dorsally wider than pereonite 3. Pereonites 5 to 7 progressively shorter posteriorly; pleotelson oval, tapering towards rounded apex, with rows of spines across anterior and middle part of pleotelson, lateral margins with spines, distal end without spines. All pleonites fused into pleotelson; total length of pleotelson about combined lengths of pereonites 5 to 7. Eyes rounded, lateral. Antennula short, reaching little beyond distal end of second peduncular segment of antenna. Antenna long, about 0.7 of total body length; robust, with few large spines on second segment; large spines distally on third segment. Pereopod 1 with long and strong unguis on dactylus, pereopods 2–4 without dactylus. Three spines present on each basis of pereopods 5 to 7. Pereopods 5–7 with two ungues, secondary robust. Oostegites present on pereopod 1–4. Male smaller than female. Pattern of spination as in females, spines smaller than in females and more robust; pereonite 4 narrow, dorsally about as wide (excluding spines) as pereonite 3. Penial plate laminar, with ridge on one side. Pleopod 1 with 5 ...