Redescription of Fuegiphoxus uncinatus (Chevreux, 1912) (Amphipoda: Gammaridea: Phoxocephalidae)

CHIESA, I.L.; ALONSO, G.M.

La Serena, Coquimbo

Congreso; The Crustacean Society Mid-Year Meeting; 2007

Universidad Católica del Norte y Universidad Andres Bello, Chile

The genus Fuegiphoxus Barnard & Barnard, 1980 is constituted by four species: F. uncinatus, F. abjectus, F. fuegiensis and F. inutilus. The species Fuegiphoxus uncinatus was provisionally assigned to Fuegiphoxus by Barnard & Barnard (1980), since this species was figured by Chevreux (1912) without fine details. Fuegiphoxus is distributed in the Magellan region, Antarctic and sub-Antarctic waters; F. uncinatus is present in the Magellan region (Magellan Straits, Beagle Channel, Brecknock Channel and Goree Pass), South Shetland Islands, Drake Passage, Palmer Archipelago and Weddell Sea. The type material of F. uncinatus was borrowed from the Muséum National d'Histoire Naturelle, Paris; all the appendages mounted in microscopic slides were drawn in detail using a microscope Carl Zeiss Axioskop equipped with a camera lucida. According to our observations, Fuegiphoxus uncinatus is characterized by: antenna 2 facial robust setae on article 4 in one main row, with additional proximal setae: formula 3-5-3; right lacinia mobilis bifid, subflabellate, left with four teeth; mandibular palp, article 1 short, article 2 without outer setae, apex with 6 setae; maxilliped, inner plate bearing 2 apical thick robust setae, 5 subapicofacial and 7 medial plumose setae, dactyl with nail medium length; uropod 1 peduncle with 7 basofacial setae, outer ramus with 3 and inner with 1 dorsal robust setae;uropod 2 peduncle with 11 dorsal robust setae, outer ramus with 2 dorsal robust setae, inner naked; rami of uropods 1 and 2 with immersed apical nails; telson bearing 3 apical robust setae. F. uncinatus belongs indeed to Fuegiphoxus; however, the genus must be redescribed adding the following morphological character states: inner plate of maxilliped bearing 1 or 2 apical thick robust setae, and telson with 2 or 3 apical robust setae on each lobe. This research was partially supported by the ANPCyT (PICT 02-11180) and the Argentine Scientific Council (CONICET).