Seba saundersii Stebbing, 1875

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 : 1888-1889

Seba saundersii Stebbing, 1875

Seba saundersii Stebbing, 1875: 186 , pl. 15A, fig. 2.

Seba saundersii: Stebbing, 1888: 783–787 , pl. 49; Holman and Watling, 1983: 250, fig. 28; Chiesa et al., 2005: 171, tb. 2, 172; De Broyer et al., 2007: 200, 201.

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 : 5 ♀♀ 2.6–3 mm, 3 ♂♂ 2.8–3.7 mm, 24 May 1999, MACN-In 38776; 1 ♀ 3 mm, 27 May 1999, MACN-In 38777. Same location, same colls., 11 August 1999 : 2 ♀♀ 3 and 3.25 mm, 1 ♂ 3.3 mm, MACN-In 38778a; 1 ♂ 3 mm, MACN-In 38778b; 1 ♀ 3.25 mm, MACN-In 38778c; 1 ovig. ♀ 3 mm, 3 ♀♀ 2.2–2.85 mm, 3 ♂♂ 3–3.2 mm, MACN-In 38778d. Same location, same colls., 1 November 1999 : 1 ovig. ♀ 3 mm, 1 ♀ 3.3 mm, 1 ♂ 3.1 mm, MACN-In 38779a; 2 ♀♀ 3 mm, 1 ♂ 3.15 mm, MACN-In 38779b. Same location, same colls., 10 November 1999 : 1 ♀ 2.8 mm, 1 ♂ 3 mm, MACN-In 38780a; 1 ♀ 3 mm, 1 ♂ 2.7 mm, MACN-In 38780b; 1 ovig. ♀ 3 mm, 1 ♀ 2.8 mm, 2 ♂♂ 2.8 and 3.3 mm, MACN-In 38780c; 8 ♀♀ 2.6–3 mm, 1 sex indet. 2.2 mm, 5 ♂♂ 3–3.3 mm, MACN-In 38780d; 1 ♂ 3.5 mm, MACN-In 38780e. Same location, same colls., 10 February 2000 ; 3 ♀♀ 2.9–3 mm, MACN-In 38781a; 1 ♀ 3.5 mm, 3 ♂♂ 3–3.6 mm, MACN-In 38781b; 1 ovig. ♀ 3.2 mm, 2 ♀♀ 2.7 and 3.25 mm, MACN-In 38781c; 1 ♀ 3 mm, MACN-In 38781d; 6 ♀♀ 2.8–3.05 mm, 4 ♂♂ 2.7–3.7 mm, MACN-In 38781e. Same location, same colls., 14 February 2000 : 1 ♀ 3.5 mm, 1 ♂ 3.9 mm, MACN-In 38782a; 3 ♀♀ 2.2–3.05 mm, 2 ♂♂ 3 and 3.4 mm, MACN-In 38782b. Same location, same colls., 2 May 2000 : 3 ♀♀ 2.25–3.25 mm, 2 ♂♂ 3.5 and 3.6 mm, MACN-In 38783a; 1 ovig. ♀ 3.15 mm, 1 ♀ 2 mm, 2 ♂♂ 2.9 and 3.15 mm, MACN-In 38783b; 2 ♀♀ 3 and 3.5 mm, 3 ♂♂ 3–3.1 mm, MACN-In 38783c; 1 ♀ 3 mm, MACN-In 38783d. Same location, same colls., 29 May 2000 : 1 sex indet., 2.4 mm, MACN-In 38784a; 1 ovig. ♀ 3 mm, 2 ♀♀ 3 and 3.5 mm, MACN-In 38784b; 4 ♀♀ 2.85–3.25 mm, 1 ♂ 3.15 mm, MACN-In 38784c; 2 ♀♀ 2.9 and 3 mm, 2 ♂♂ 2.95 and 3 mm, MACN-In 38784d; 1 ♀ 3.05 mm, MACN-In 38784e. Tierra del Fuego province; off Bahía San Sebastián, sta 1, 53 ◦ 22 ′ S, 68 ◦ 00 ′ W : 2 ♂♂ 2.7 and 3.5 mm, 1 sex indet. 1.85 mm, 8.25 m depth, 12–13 November 2002, coll. and don. M. C. Sueiro, MACN-In 38785. Walther Herwig 15 survey; sta 245, 36 ◦ 49 ′ S, 54 ◦ 02 ′ W: 3 ovig . ♀♀ 3.95–4 mm, 8 ♀♀ 3.8–4.5 mm, 1 ♂ 4.5 mm, 2 sex indet. 3 and 4 mm, in sponges, 600 m depth, 14 June 1966, don. L. Orensanz, MACN-In 38786.

Remarks

Seba saundersii Stebbing, 1875 is widely distributed in Antarctica, sub-Antarctic islands and the Magellanic area. The present habitat in the holdfasts of M. pyrifera from the Beagle Channel represents a new ecological record. Arnaud (1974) found this species associated with holdfasts of M. pyrifera for Kerguelen Islands. The presence of S. saundersii at about 36 ◦ S and 600 m depth is mentioned in Uruguay for the first time; its hitherto known bathymetric range was from 5 to 250 m ( De Broyer et al. 2007).