Amphipod crustaceans (Corophiidea and Gammaridea) associated with holdfasts of Macrocystis pyrifera from the Beagle Channel (Argentina) and additional records from the Southwestern Atlantic Author Alonso, G. M. text Journal of Natural History 2012 2012-08-31 46 29 - 30 1799 1894 http://dx.doi.org/10.1080/00222933.2012.692825 journal article 10.1080/00222933.2012.692825 1464-5262 5200405 Crassicorophium bonnellii ( Milne-Edwards, 1830 ) Corophia bonnellii Milne-Edwards, 1830: 385 . Corophium bonelli : Bousfield, 1973: 202–203 , pl. 62, fig. 1, pl. 67, fig. b, pl. 68, fig. b. Corophium bonnellii: Lincoln, 1979: 530 , fig. 254a–c. Crassicorophium bonelli : Bousfield and Hoover, 1997: 105–107 , fig. 23. Crasicorophium bonnellii : De Broyer et al., 2007: 240–241 . 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 : 1 ♀ 3.5 mm , 24 May 1999 , MACN- In 38486. Same location, same colls., 27 May 1999 : 1 ♀ 2.8 mm , MACN-In 38487a; 1 ♀ 2.8 mm , MACN-In 38487b; 2 ♀♀ 4.25 and 4.7 mm , MACN-In 38487c; 2 ovig. ♀♀ 3.8 and 3.95 mm , 3 ♀♀ 3.5–4.1 mm , 11 August 1999 , MACN-In 38488. Same location, same colls., 1 November 1999 : 1 ♀ 4 mm , MACN-In 38489a; 2 ovig. ♀♀ 3.5 and 3.6 mm , 2 ♀♀ 2.6 and 2.8 mm , MACN-In 38489b; 3 ovig. ♀♀ 3.5–4 mm , MACN-In 38489c. Same location, same colls., 10 November 1999 : 1 ovig. ♀ 3 mm , 1 ♀ 2.8 mm , MACN-In 38490a; 2 ovig. ♀♀ 3.3 and 3.9 mm , MACN-In 38490b. Same location, same colls., 10 February 2000 : 2 ovig. ♀♀ 3.2 and 3.5 mm , MACN-In 38491a; 1 ovig. ♀ 4 mm , MACN-In 38491b; 1 ovig. ♀ 4.5 mm , 1 ♀ 3 mm , MACN-In 38491c; 2 ovig. ♀♀ 4 and 4.5 mm , MACN-In 38491d; 8 ♀♀ 3.3–4.8 mm , MACN-In 38491e. Same location, same colls., 14 February 2000 : 5 ♀♀ 2.6–4.2 mm , MACN-In 38492a; 4 ♀♀ 3–4 mm , MACN-In 38492b; 1 ovig. ♀ 3.8 mm , 1 ♀ 2.7 mm , MACN-In 38492c. Same location, same colls., 2 May 2000 : 2 ♀♀ 3.8 and 4 mm , MACN-In 38493a; 2 ♀♀ 3 and 3.2 mm , MACN-In 38493b; 2 ♀♀ 2.8 and 3.3 mm , MACN-In 38493c; 1 ovig. ♀ 3.5 mm , 2 ♀♀ 3 and 3.2 mm , MACN-In 38493d. Same location, same colls., 29 May 2000 : 4 ♀♀ 3.2–4.1 mm , MACN-In 38494a; 1 ovig. ♀ 3 mm , 1 ♀ 2.95 mm , MACN-In 38494b; 1 ovig. ♀ 3 mm , 1 ♀ 2.9 mm , MACN-In 38494c. Chubut province ; associated to Corallinaceae ; don. G. Liuzzi , Rada Tilly , 45 ◦ 56.864 ′ S , 67 ◦ 32.803 ′ W : 6 ♀♀ 1–2 mm , MACN-In 38495, 45 ◦ 56.800 ′ S , 67 ◦ 32.798 ′ W : 12 ♀♀ 1.1–2.5 mm , MACN-In 38496, 8 June 2005 ; Comodoro Rivadavia , 45 ◦ 52.059 ′ S , 67 ◦ 28.443 ′ W : 1 ♀ 3 mm , MACN-In 38497, 45 ◦ 52.017 ′ S , 67 ◦ 28.336 ′ W : 2 ♀♀ 1.9–2 mm , MACN-In 38498, 7 June 2005 . Remarks The present material of Crassicorophium bonnellii ( Milne-Edwards, 1830 ) , whose males have not been yet reported in literature, agrees with the descriptions and figures given by Bousfield (1973) and Lincoln (1979) . It was found for the first time from Chubut province to the Argentine sector of the Beagle Channel. Moreover, this is the first report of M. pyrifera holdfasts as habitat for this species. This taxon, which originated from outside the Southwest Atlantic, is probably a non-indigenous species established in the Magellanic area.