Atyloella magellanica ( Stebbing, 1888 )

Alonso, G. M., 2012, Amphipod crustaceans (Corophiidea and Gammaridea) associated with holdfasts of Macrocystis pyrifera from the Beagle Channel (Argentina) and additional records from the Southwestern Atlantic, Journal of Natural History 46 (29 - 30), pp. 1799-1894 : 1885-1886

Atyloella magellanica ( Stebbing, 1888)

Atylopsis magellanicus Stebbing, 1888: 925–929 , pl. 79.

Atyloella magellanica: Bellan-Santini and Ledoyer, 1974: 652 , pl. 7A; Chiesa et al., 2005: 170, tb. 2, 172; De Broyer et al., 2007: 65, 66.

Material examined

Argentina; Beagle Channel, northern Isla Despard, 54 ◦ 52 ′ S, 68 ◦ 10 ′ W, 8–12 m depth, colls. D. Aureliano and A. Ferlito, don. G. Lovrich, 19 March 1999: 1 ovig. ♀ 8 mm, 1 ♀ 7.5 mm, MACN-In 38731a; 5 ovig. ♀♀ 6.3–8 mm, 1 ♀ 8 mm, MACN-In 38731b; 1 sex indet. 6.4 mm, MACN-In 38731c. Same location, same colls., 24 May 1999:1 ovig. ♀ 9 mm, 1 ♀ 8, MACN-In 38732a; 1 ♂ 6.5 mm, MACN-In 38732b; 2 ovig. ♀♀ 8 and 9 mm, 2 ♀♀ 6.9 and 7 mm, MACN-In 38732c; 2 ♂♂ 6.8 and 6.9 mm, MACN-In 38732d; 1 ovig. ♀ 8.2 mm, MACN-In 38732e; 1 ovig. ♀ 8 mm, 6 ♀♀ 7.2–9 mm, MACN- In 38732f; 4 ovig. ♀♀ 7.2–9 mm, 5 ♀♀ 7–8.5 mm, MACN-In 38732g. Same location, same colls., 27 May 1999: 1 ovig. ♀ 8.2 mm, MACN-In 38733a; 1 ♂ 7.6 mm, MACN-In 38733b; 3 ovig. ♀♀ 8–9 mm, 4 ♀♀ 7–8.7 mm, MACN-In 38733c; 1 ♂ 6.8 mm, MACN- In 38733d; 2 sex indet. 4.6 and 5 mm, MACN-In 38733e. Same location, same colls., 5 August 1999: 2 ovig. ♀♀ 7 and 8 mm, 3 ♀♀ 7–8 mm, MACN-In 38734a; 1 ovig. ♀ 7.6 mm, MACN-In 38734b; 3 ovig. ♀♀ 8–8.3 mm, MACN-In 38734c; 1 ♂ 5.3 mm, MACN-In 38734d. Same location, same colls., 11 August 1999: 5 ovig. ♀♀ 7–9 mm, 4 ♀♀ 7–8.9 mm, 1 sex indet. 5.5 mm, MACN-In 38735a; 1 ♂ 7.7 mm, MACN-In 38735b; 1 ovig. ♀ 7 mm, 1 ♀ 8 mm, MACN-In 38735c; 1 sex indet. 5 mm, 1 November 1999, MACN-In 38736. Same location, same colls., 10 November 1999: 1 ovig. ♀ 9 mm, MACN-In 38737a; 2 ovig. ♀♀ 8 mm, 2 ♀♀ 6.5 and 9.2 mm, MACN-In 38737b; 1 ovig. ♀ 7.5 mm (damaged), 1 sex indet. 4 mm, MACN-In 38737c; 1 ♀ 10 mm, MACN-In 38737d. Same location, same colls., 10 February 2000: 1 ovig. ♀ 9 mm, 1 ♀ 8.5 mm, MACN-In 38738a; 3 ♀♀ 6–7 mm, 3 sex indet. 5.2–6 mm, MACN-In 38738b. Same location, same colls., 14 February 2000: 1 sex indet. 5.8 mm, MACN-In 38739a; 1 sex indet. 5.2 mm, MACN-In 38739b; 1 ♀ 6 mm, MACN-In 38739c; 1 ♀ 6.3 mm, MACN- In 38739d; 1 ♂ 5 mm, MACN-In 38739e. Same location, same colls., 2 May 2000: 1 ovig. ♀ 8 mm, 1 ♀ 7 mm, MACN-In 38740a; 1 ovig. ♀ 7.5 mm, 1 ♀ 6 mm, MACN-In 38740b; 1 ovig. ♀ 7.9 mm, 2 ♀♀ 6 and 8 mm, MACN-In 38740c; 1 ♂ 5.8 mm, MACN- In 38740d. Same location, same colls., 29 May 2000: 2 ovig. ♀♀ 7.5 and 8.5 mm, MACN-In 38741a; 1 sex indet. 5.3 mm, MACN-In 38741b; 2 sex indet. 6.5 and 7 mm, MACN-In 38741c; 1 sex indet. 5.5 mm, MACN-In 38741d. Shinkai Maru X survey; don. R. Bastida, sta Ad 1, 42 ◦ 28 ′ S, 63 ◦ 19 ′ W: 1 ovig. ♀ 8 mm, 56 m depth, 20 January 1979, MACN-In 38742; sta 6, 38 ◦ 31 ′ S, 56 ◦ 22 ′ W: 1 ovig. ♀ 10.5 mm, 1 ♀ 8.7 mm, 85 m depth, 14 January 1979, MACN-In 38743a; 2 ♂♂ 7.9 and 8.3 mm, MACN-In 38743b .

Remarks

Atyloella magellanica is well documented in Antarctica, sub-Antarctic islands and the Magellanic area. The studied material collected from sediment in the Argentine continental shelf, is a new record and the northern distribution of the species is at approximately 38 ◦ S. The species is abundant in the south of Chile and also extends to the north of this country reaching similar latitudes. Its association with the holdfasts of M. pyrifera from the Beagle Channel had been mentioned before ( Schellenberg 1931). Arnaud (1974) found the species in the same habitat from Kerguelen Islands.