Onisimus edwardsii Kroyer 1846

• Main Authors: Berge, Jørgen, Vader, Wim, Johnsen, Jan Roger
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2007
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Uristidae; Onisimus; Onisimus edwardsii; Atlantic Arctic; Atlantic-Arctic; Barrow; Chukchi; Chukchi Sea; Greenland; Point Barrow; Tromsø; Alaska
• Online Access: https://doi.org/10.5281/zenodo.6249008; http://treatment.plazi.org/id/03A087996441FF98FF52A798FF1AFA11

Onisimus edwardsii (Krøyer, 1846) Anonyx edwardsii Krøyer 1846: 41 Onesimus Edwardsii Sars 1891: 105; Stephensen 1913: 121 Onisimus edwardsii Shoemaker 1930: 228; Lowry & Stoddart 1993:173. Onisimus edwardsi Gurjanova 1951: 162 Boeckosimus edwardsii Barnard 1969: 330 Type locality Greenland. Diagnosis Epimeral plate 3 with slightly upturned tooth. Pereopod 1 propodus clearly longer than carpus, pereopods 3 and 4 propodus with posterior margin with paired robust setae and setae, P4 coxa with moderate posteroventral lobe. Telson cleft 30%. Material examined USNM Acc.no 182783, Indian Harbor, Labrador, 1 spm. SMNH 6672 det: O. plautus , male, 9mm, Matoschkin scharr, Belusha viken, 6 spm. TMU xxx, Female, 10mm, Ekkerøy 2–3m; TMU 1168, male, 8 mm, Vardø; TMU 10025, Herwigshavna. Distribution Stephensen (1923) provided a distribution map of the Atlantic records of O. edwardsii as in the case of O. plautus , there are also here a few old records from S. Norway and W. Sweden, where the species never has been refound, in spite of extensive collecting; there is even an old, vague record from the Kattegat, dating from Meinert (cf Stephensen 1923b). The most recent Norwegian catalogue (Vader et al. 1997) only has records from Tromsø (69*50’N) and north, and also here there are only a few reports. Otherwise this species is common and often numerous in the Atlantic Arctic (cf Stephensen 1923, 1935, 1944), and also along the entire arctic coast of Russia East to the Chukchi Sea (Gurjanova 1985, Tzvetkova & Golikov 2001) and in the cold eastern waters of Canada (Shoemaker 1930, 1930b, Dunbar 1954, Brunel et al. 1998) south to Nova Scotia. The species was not present in the extensive collections from Point Barrow, Alaska, however (Shoemaker 1955), nor does Gurjanova (1962) report on any Pacific material. Biology Onisimus edwardsii is a well-known general scavenger; it is easily and in large numbers collected in baited traps, and has also been found clustering on dead invertebrates in the field (Berge, pers. obs., ...