Cyclocaris guilelmi Chevreux, 1899

Horton, Tammy & Thurston, Michael H., 2014, A revision of the bathyal and abyssal necrophage genus Cyclocaris Stebbing, 1888 (Crustacea: Amphipoda: Cyclocaridae) with the addition of two new species from the Atlantic Ocean, Zootaxa 3796 (3), pp. 507-527 : 524

Cyclocaris guilelmi Chevreux, 1899

Cyclocaris Guilelmi Chevreux, 1899: 148–152 , figs 1–5;— Sars, 1900: 20–25, pls 2–3;— Damas and Koefoed, 1907: p. 438;—Stephensen, 1917 (1913): 107–108;— Chevreux, 1935: 28–30, pl. 16, figs 3, 8, 24, 26.

Cyclocaris guilelmi Stebbing, 1906: 31 ;— Brüggen, 1907: 215–216;— Stephensen, 1923: 52–54, chart 10;— Schellenberg, 1927: 664–665, fig. 59;— Stephensen, 1933: 8–9, map, fig. 3;— Stephensen, 1935: 43, figs 2–3;— Gurjanova, 1951: 181–182, fig. 53.— Barnard, 1958: 91.— Barnard, 1959: 116–117, figs 4–5.— Gurjanova, 1962: 87–88, fig. 18.— Barnard & Karaman, 1991: 479.— Bucklin et al., 2010: 42, 46.

Cyclocaris faroensis Norman, 1900: 197–198 , pl. 6, figs 5–15.— Thurston & Allen, 1969: 358.

Remarks. This species differs from all others in the genus by the permanent yellow-brown ocular pigment covering the whole surface of the head. The absence of eyelobes separates it from C. lowryi and C. franki . The comparison is based on Barnard (1959), the best available account of the species.

C.guilelmi is a well known Arctic species. It occurs widely at mesopelagic and bathypelagic depths, mostly at 500-2000+m ( Stephensen, 1923, Østvedt, 1955, Birstein & Vinogradov, 1958, 1970), but has been recorded in the epipelagic zone ( Sars, 1900, Stephensen, 1933). The species is attracted to sediment traps in large numbers ( Seiler & Brandt, 1997, Kraft et al. 2013) and has been taken occasionally in baited traps, both benthic, at 1095 m ( Chevreux, 1899, 1935), and midwater, at 1800 m ( Barnard, 1959). The species appears to breed throughout the year ( Kraft et al. 2013).

Distribution. Disjunct: Arctic Ocean, north-west Pacific Ocean. Norwegian Sea, Greenland Sea, south to the Faroe-Shetland Channel ( Norman, 1900, Stephensen, 1923, Østvedt, 1955, Seiler & Brandt, 1997, Vinogradov, 1997, Kraft et al. 2013); Baffin Bay ( Stephensen, 1933, Buchanan & Sekerak, 1982); Arctic Ocean, Nansen, Amundsen, Makarov and Canadian Basins ( Sars, 1900, Barnard, 1959, Kosobokova et al., 2011); Pacific Ocean north of 39˚N and west of 170˚E (Birstein & Vinogradov, 1955, 1958, 1970).