Onisimus plautus Kroyer 1845

• Main Authors: Berge, Jørgen, Vader, Wim, Johnsen, Jan Roger
• Format: Other/Unknown Material
• Language: unknown
• Published: 2007
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Uristidae; Onisimus; Onisimus plautus; Canada; Greenland; Kara Sea; Laptev Sea; Norway; Dolphin and Union Strait; East Greenland; laptev
• Online Access: https://zenodo.org/record/6249000; https://doi.org/10.5281/zenodo.6249000

Onisimus plautus (Krøyer, 1845) Figure 5–8 Type locality South East Greenland. Diagnosis Antenna 1 peduncle anterodorsally produced. Uropod 1 peduncle weakly longer than rami. Cephalic lobe triangular and acute. Coxa 1 rectangular (not expanded ventrally). Pereopod 1 propodus as long as carpus, dactylus as long as palm. Telson cleft 1 / 3. Material examined USNM 119980, Dolphin and Union Strait, Canada, 2 spm. F 13184, Karmøy, Norway, 6 spm. CRU Type, Greenland; CRU 3208, male, 8mm, South East Greenland; CRU 3208, female, 9mm, South East Greenland. N 23433 female, 10mm, Laptev sea; N 23434 male, 12 mm, Laptev sea. SMNH 3509, Møller bay. Novaja Semlya Exp, 1875, about 30 spm; SMNH 6669, 8 fvn, 70 ° 12 ’ 65 ° 45 ’, Kara sea, 1 spm; SMNH 6662, 1 spm; SMNH 6659, 1 spm. SMNH 6667, Novaja Semlya exp. 1875, 10 fvn, 73 ° 40 ’ 69 ° 10 ’, 10 fvn, 3 spm. SMNH 6664, 5 spm; SMNH 3502 female, 6.5mm, Møller bay. Description (based upon N 23433 adult female, 10mm, and N 23434 adult male, 12 mm; both from Laptev sea. Zool.Inst. St.Petersburg. Det: O. turgidus.) Head and body: Head slightly longer than first pereonite. Cephalic lobe broadly triangular, distally acute; margins straight. Eyes yellow-brown in alcohol, oval, enlarged in adult male. Urosomite 1 with moderate dorsal depression. Antennae: Antenna 1 as long as head and the next two body segments; peduncle slightly longer than head, article 1 longer than broad, anterodorsal ‘nose’ not conspicuous; accessory flagellum exceeds half the length of primary flagellum, 5 -articulate, article 1 as long as the rest of primary flagellum, longer than article 1 of primary flagellum; primary flagellum 11 -articulate, article 1 length equals next 3 articles, article 1 and article 2 primary flagellum with 2 slender robust setae distally; no calceoli on flagellum. Antenna 2 length about 1.3 times antenna 1; flagellum 19 -articulate; peduncle article 4 longer than article 5; no calceoli on flagellum. Both antennae longer, and with higher number of articles, in males than in females. ...