Onisimus turgidus

• Main Authors: Vader, Wim, Johnsen, Jan Roger, Tandberg, Anne Helene S.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Uristidae; Onisimus; Onisimus turgidus; Arctic; Barents Sea; Norway; Tromsø; Lowry; Finnkroken
• Online Access: https://zenodo.org/record/5633968; https://doi.org/10.5281/zenodo.5633968

Onisimus turgidus (Sars, 1879) Figs 4–10 Anonyx turgidus Sars, 1879: no 13. Onisimus turgidus – Sars, 1885: 147, pl. xii, fig. 5, comb. nov. (described as sp. nov.). — Lowry & Stoddart 1993: 169. — Johnsen 2001: 60, fig. 21. — Zimina et al. 2019: 871. Onisimus normani – Stephensen 1923: 48. — Shoemaker 1930: 11. — Vader 1975: 38. — Moore et al. 1994: 206. — Vader & Krapp-Schickel 1996: 65. — Bryazgin 1997: 99. — Lyubina et al. 2014: 246. (These are all not O. normani, but O. turgidus.) Material examined NORWAY • 1 ♀, syntype (15 mm); Barents Sea; 72°53′ N, 21°51′ E; 408 m depth; 30 Jul. 1878; G.O. Sars leg.; stn 323 (trawl), Norwegian North sea Expedition; 1.5°C; silt.; F1764 (Figs 4–6) • 1 ♀ (10 mm); Kuberget Ullsfjorden; 100 m depth; Sep. 1974; Wim Vader leg.; from Actinostola callosa; TSZCr8573. (Figs 7–10) • 1 spec.; Ullsfjorden; from Actinostola callosa; TM IX-95 • 2 specs; Ullsfjorden; 69°39′48″ N, 19°45′18″ E; 106 m depth; 28 Apr. 1995; Wim Vader leg.; from Actinostola callosa; stn JohanRuud 255-95; TSZCr14488 • 21 specs; Ullsfjorden; Jun. 1995; Wim Vader leg.; from Actinostola callosa; stn Hyas 6-95; Arctic University Museum of Tromsø • 1 spec., Finnkroken; 50– 60 fathoms depth; 1900; J. Sparre Schneider leg.; TSZCr1171. Distribution Johnsen (2001) studied samples of presumed Onisimus normani from different parts of the world, and concluded that they all (except the ones from S Norway) belonged in the turgidus species complex; unfortunately there was not sufficient material available to be able to revise this entire complex. The type material was collected from the Barents Sea and it has been collected from this area several times since (Bryazgin 1997; Lyubina et al. 2014, sub nomine O. normani; Zimina et al. 2019). Material from N Norway (Ullsfjorden) is quite similar to the type material, but the animals are smaller, 10 mm against 14 mm for the type. No fully adult or ovigerous specimens of O. turgidus have been found as yet, similar to the situation in O. normani. Onisimus turgidus also spends ...