PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON 113(3):7 10-720. 2000. Eophoxocephalopsis colombus, a new species (Crustacea: Amphipoda: Phoxocephalopsidae) from the southwest Atlantic Gloria M. Alonso de Pina Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Division Invertebrados, Avda. Angel Gallardo 470, (1405) Buenos Aires, Argentina Abstract. — A new species, Eophoxocephalopsis colombus, is described and illustrated from the Chubut province: Golfo Nuevo, and the south of Buenos Aires province. The assignment of the new species to Eophoxocephalopsis is discussed. It is separated from the other species of the genus by the shape and number of setae on the inner plate of maxilla 1, and the shape of epimera 2 and 3. The specimens were dredged from sandy substrata at different depths. The new species described here was found on the southwest Atlantic coast of Chubut province: Golfo Nuevo, Colombo beach, at approximately 42°37'S, 64°16'W, and in the Argentine continental shelf of El Rincon area, in the Buenos Aires province, approximately 39° to 40°S and 61° to 62°W. Specimens were obtained with a small dredge in the first locality mentioned above and with a Van Veen dredge during a sur-vey carried out by the RA^ El Austral in the second locality. All samples were collected in sandy substrates at different depths in the intertidal and subtidal zones. The type specimens are deposited in the Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires, Argentina (MACN). Eophoxocephalopsis Thurston, 1989 Eophoxocephalopsis colombus, new species Figs. 1-49 Holotype. — Ovigerous female 3.8 mm (MACN N° 34377), Chubut province: Gol-fo Nuevo, Colombo beach (approximately 42°37'S, 61°16'W); depth 2 m; 2 Nov 1995. Paratypes. — 9 females 2.5-3.6 mm (MACN N° 34378), 1 1 males 2.25-3.0 mm (MACN N° 34379), Chubut province: Gol-fo Nuevo, Colombo beach (approximately 42°37'S, 61°16'W); depth 2 m; 2 Nov 1995. 4 females 2.75-3.85 mm (MACN N° 34380), Chubut province: Golfo Nuevo, Colombo beach (approximately 42°37'S, 61°16'W); depth 0.4 m; 3 Nov 1995. 1 male 2.8 mm (MACN N° 34381), 39°10'04"S, 61°10'03"W (sta 5); depth 17 m; 3 Nov 1993; 3 females 3.2-3.45 mm (MACN N° 34382), 1 male 2.3 mm (MACN N° 34383), 39°15'10"S, 61°34'41"W (sta 11); depth 14 m; 3 Nov 1993; 2 females 3.2 and 3.3 mm (MACN N° 34384), 1 male 2.05 mm (MACN N° 34385), 39°15'02"S, 61°25'03"W (sta 12); depth 17 m; 3 Nov 1993; 1 ovig-erous female 3.5 mm (MACN N° 34386), 1 male 3.25 mm (MACN N° 34387), 39°14'49"S, 61°14'50"W (sta 13); depth 17 m; 3 Nov 1993; 2 males 3.1 and 3.2 mm (MACN N° 34388), 39°24'59"S, 6r50'02"W (sta 18); depth 11.5 m; 1 Nov 1993; 6 males 2.8-3.4 mm (MACN N° 34389), 4 juveniles 1.6-2.8 mm (MACN N° 34390), 40°09'52"S, 61°5r55"W (sta 32); depth 15 m; 2 Nov 1993; 2 females 3.8 and 3.9 mm (MACN N° 34391), 1 male 3.45 mm (MACN N° 34392), 40°19'46"S, 61°51'55"W (sta 34); depth 15 m; 2 Nov 1993; Buenos Aires province: El Rincon.
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