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A NEW SPECIES OF VENTOJASSA (CRUSTACEA: AMPHIPODA: COROPHIIDEA: ISCHYROCERIDAE) FROM THE BEAGLE CHANNEL, ARGENTINA Alonso, G.M.1, Chiesa, I.L.1,2 1 Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Div. Invertebrados, Av. Ángel Gallardo 470, (C1405DJR) Buenos Aires, Argentina 2 Laboratorio de Artrópodos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina E-mails: galonso@macn.gov.ar, ichiesa@macn.gov.ar Ventojassa Barnard, 1970 is composed of six species distributed in Australia, New Zealand, Madagascar, Korea and southern California. Vader and Myers (1996) pointed out that the poorly described and figured V. georgiana (Schellenberg, 1931) cited from southern Tierra del Fuego, Magellan Straits, Antarctica and sub-Antarctic islands could not belong with this genus and they provisionally transferred the species to a new genus (Ruffojassa). Ventojassa is distinguished by accessory flagellum well developed; coxae 1-5 of similar depth; coxa 4 not excavate posteriorly; uropod 3 peduncle lacking setae or with fine setae on its outer margin, outer ramus recurved apically, bearing 1-3 wire setae and telson with two or more subapical cusps. Ventojassa sp. nov., collected in the Beagle Channel, northern of Despard Island (54º 52´S 68º10´W) at 8-12 m depth, was associated to holdfasts of Macrocystis pyrifera. It is characterized by head with lateral cephalic lobes triangular and apically acute; eyes located far from the apex of ocular lobes; maxilla 1, inner plate naked; gnathopod 1 propodus shorter than carpus; female gnathopod 2 much stronger than 1, carpus subtriangular, very short, propodus subquadrate; male gnathopod 2 stouter than in female, carpus short, saucer-like, propodus very robust, quadrate, with a slight round process at the palmar corner, Barnard, 1970 is composed of six species distributed in Australia, New Zealand, Madagascar, Korea and southern California. Vader and Myers (1996) pointed out that the poorly described and figured V. georgiana (Schellenberg, 1931) cited from southern Tierra del Fuego, Magellan Straits, Antarctica and sub-Antarctic islands could not belong with this genus and they provisionally transferred the species to a new genus (Ruffojassa). Ventojassa is distinguished by accessory flagellum well developed; coxae 1-5 of similar depth; coxa 4 not excavate posteriorly; uropod 3 peduncle lacking setae or with fine setae on its outer margin, outer ramus recurved apically, bearing 1-3 wire setae and telson with two or more subapical cusps. Ventojassa sp. nov., collected in the Beagle Channel, northern of Despard Island (54º 52´S 68º10´W) at 8-12 m depth, was associated to holdfasts of Macrocystis pyrifera. It is characterized by head with lateral cephalic lobes triangular and apically acute; eyes located far from the apex of ocular lobes; maxilla 1, inner plate naked; gnathopod 1 propodus shorter than carpus; female gnathopod 2 much stronger than 1, carpus subtriangular, very short, propodus subquadrate; male gnathopod 2 stouter than in female, carpus short, saucer-like, propodus very robust, quadrate, with a slight round process at the palmar corner, 1 Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Div. Invertebrados, Av. Ángel Gallardo 470, (C1405DJR) Buenos Aires, Argentina 2 Laboratorio de Artrópodos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina E-mails: galonso@macn.gov.ar, ichiesa@macn.gov.ar Ventojassa Barnard, 1970 is composed of six species distributed in Australia, New Zealand, Madagascar, Korea and southern California. Vader and Myers (1996) pointed out that the poorly described and figured V. georgiana (Schellenberg, 1931) cited from southern Tierra del Fuego, Magellan Straits, Antarctica and sub-Antarctic islands could not belong with this genus and they provisionally transferred the species to a new genus (Ruffojassa). Ventojassa is distinguished by accessory flagellum well developed; coxae 1-5 of similar depth; coxa 4 not excavate posteriorly; uropod 3 peduncle lacking setae or with fine setae on its outer margin, outer ramus recurved apically, bearing 1-3 wire setae and telson with two or more subapical cusps. Ventojassa sp. nov., collected in the Beagle Channel, northern of Despard Island (54º 52´S 68º10´W) at 8-12 m depth, was associated to holdfasts of Macrocystis pyrifera. It is characterized by head with lateral cephalic lobes triangular and apically acute; eyes located far from the apex of ocular lobes; maxilla 1, inner plate naked; gnathopod 1 propodus shorter than carpus; female gnathopod 2 much stronger than 1, carpus subtriangular, very short, propodus subquadrate; male gnathopod 2 stouter than in female, carpus short, saucer-like, propodus very robust, quadrate, with a slight round process at the palmar corner, Barnard, 1970 is composed of six species distributed in Australia, New Zealand, Madagascar, Korea and southern California. Vader and Myers (1996) pointed out that the poorly described and figured V. georgiana (Schellenberg, 1931) cited from southern Tierra del Fuego, Magellan Straits, Antarctica and sub-Antarctic islands could not belong with this genus and they provisionally transferred the species to a new genus (Ruffojassa). Ventojassa is distinguished by accessory flagellum well developed; coxae 1-5 of similar depth; coxa 4 not excavate posteriorly; uropod 3 peduncle lacking setae or with fine setae on its outer margin, outer ramus recurved apically, bearing 1-3 wire setae and telson with two or more subapical cusps. Ventojassa sp. nov., collected in the Beagle Channel, northern of Despard Island (54º 52´S 68º10´W) at 8-12 m depth, was associated to holdfasts of Macrocystis pyrifera. It is characterized by head with lateral cephalic lobes triangular and apically acute; eyes located far from the apex of ocular lobes; maxilla 1, inner plate naked; gnathopod 1 propodus shorter than carpus; female gnathopod 2 much stronger than 1, carpus subtriangular, very short, propodus subquadrate; male gnathopod 2 stouter than in female, carpus short, saucer-like, propodus very robust, quadrate, with a slight round process at the palmar corner, 1 Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Div. Invertebrados, Av. Ángel Gallardo 470, (C1405DJR) Buenos Aires, Argentina 2 Laboratorio de Artrópodos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina E-mails: galonso@macn.gov.ar, ichiesa@macn.gov.ar Ventojassa Barnard, 1970 is composed of six species distributed in Australia, New Zealand, Madagascar, Korea and southern California. Vader and Myers (1996) pointed out that the poorly described and figured V. georgiana (Schellenberg, 1931) cited from southern Tierra del Fuego, Magellan Straits, Antarctica and sub-Antarctic islands could not belong with this genus and they provisionally transferred the species to a new genus (Ruffojassa). Ventojassa is distinguished by accessory flagellum well developed; coxae 1-5 of similar depth; coxa 4 not excavate posteriorly; uropod 3 peduncle lacking setae or with fine setae on its outer margin, outer ramus recurved apically, bearing 1-3 wire setae and telson with two or more subapical cusps. Ventojassa sp. nov., collected in the Beagle Channel, northern of Despard Island (54º 52´S 68º10´W) at 8-12 m depth, was associated to holdfasts of Macrocystis pyrifera. It is characterized by head with lateral cephalic lobes triangular and apically acute; eyes located far from the apex of ocular lobes; maxilla 1, inner plate naked; gnathopod 1 propodus shorter than carpus; female gnathopod 2 much stronger than 1, carpus subtriangular, very short, propodus subquadrate; male gnathopod 2 stouter than in female, carpus short, saucer-like, propodus very robust, quadrate, with a slight round process at the palmar corner, Barnard, 1970 is composed of six species distributed in Australia, New Zealand, Madagascar, Korea and southern California. Vader and Myers (1996) pointed out that the poorly described and figured V. georgiana (Schellenberg, 1931) cited from southern Tierra del Fuego, Magellan Straits, Antarctica and sub-Antarctic islands could not belong with this genus and they provisionally transferred the species to a new genus (Ruffojassa). Ventojassa is distinguished by accessory flagellum well developed; coxae 1-5 of similar depth; coxa 4 not excavate posteriorly; uropod 3 peduncle lacking setae or with fine setae on its outer margin, outer ramus recurved apically, bearing 1-3 wire setae and telson with two or more subapical cusps. Ventojassa sp. nov., collected in the Beagle Channel, northern of Despard Island (54º 52´S 68º10´W) at 8-12 m depth, was associated to holdfasts of Macrocystis pyrifera. It is characterized by head with lateral cephalic lobes triangular and apically acute; eyes located far from the apex of ocular lobes; maxilla 1, inner plate naked; gnathopod 1 propodus shorter than carpus; female gnathopod 2 much stronger than 1, carpus subtriangular, very short, propodus subquadrate; male gnathopod 2 stouter than in female, carpus short, saucer-like, propodus very robust, quadrate, with a slight round process at the palmar corner, 1 Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Div. Invertebrados, Av. Ángel Gallardo 470, (C1405DJR) Buenos Aires, Argentina 2 Laboratorio de Artrópodos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina E-mails: galonso@macn.gov.ar, ichiesa@macn.gov.ar Ventojassa Barnard, 1970 is composed of six species distributed in Australia, New Zealand, Madagascar, Korea and southern California. Vader and Myers (1996) pointed out that the poorly described and figured V. georgiana (Schellenberg, 1931) cited from southern Tierra del Fuego, Magellan Straits, Antarctica and sub-Antarctic islands could not belong with this genus and they provisionally transferred the species to a new genus (Ruffojassa). Ventojassa is distinguished by accessory flagellum well developed; coxae 1-5 of similar depth; coxa 4 not excavate posteriorly; uropod 3 peduncle lacking setae or with fine setae on its outer margin, outer ramus recurved apically, bearing 1-3 wire setae and telson with two or more subapical cusps. Ventojassa sp. nov., collected in the Beagle Channel, northern of Despard Island (54º 52´S 68º10´W) at 8-12 m depth, was associated to holdfasts of Macrocystis pyrifera. It is characterized by head with lateral cephalic lobes triangular and apically acute; eyes located far from the apex of ocular lobes; maxilla 1, inner plate naked; gnathopod 1 propodus shorter than carpus; female gnathopod 2 much stronger than 1, carpus subtriangular, very short, propodus subquadrate; male gnathopod 2 stouter than in female, carpus short, saucer-like, propodus very robust, quadrate, with a slight round process at the palmar corner, Barnard, 1970 is composed of six species distributed in Australia, New Zealand, Madagascar, Korea and southern California. Vader and Myers (1996) pointed out that the poorly described and figured V. georgiana (Schellenberg, 1931) cited from southern Tierra del Fuego, Magellan Straits, Antarctica and sub-Antarctic islands could not belong with this genus and they provisionally transferred the species to a new genus (Ruffojassa). Ventojassa is distinguished by accessory flagellum well developed; coxae 1-5 of similar depth; coxa 4 not excavate posteriorly; uropod 3 peduncle lacking setae or with fine setae on its outer margin, outer ramus recurved apically, bearing 1-3 wire setae and telson with two or more subapical cusps. Ventojassa sp. nov., collected in the Beagle Channel, northern of Despard Island (54º 52´S 68º10´W) at 8-12 m depth, was associated to holdfasts of Macrocystis pyrifera. It is characterized by head with lateral cephalic lobes triangular and apically acute; eyes located far from the apex of ocular lobes; maxilla 1, inner plate naked; gnathopod 1 propodus shorter than carpus; female gnathopod 2 much stronger than 1, carpus subtriangular, very short, propodus subquadrate; male gnathopod 2 stouter than in female, carpus short, saucer-like, propodus very robust, quadrate, with a slight round process at the palmar corner, 1 Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Div. Invertebrados, Av. Ángel Gallardo 470, (C1405DJR) Buenos Aires, Argentina 2 Laboratorio de Artrópodos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina E-mails: galonso@macn.gov.ar, ichiesa@macn.gov.ar Ventojassa Barnard, 1970 is composed of six species distributed in Australia, New Zealand, Madagascar, Korea and southern California. Vader and Myers (1996) pointed out that the poorly described and figured V. georgiana (Schellenberg, 1931) cited from southern Tierra del Fuego, Magellan Straits, Antarctica and sub-Antarctic islands could not belong with this genus and they provisionally transferred the species to a new genus (Ruffojassa). Ventojassa is distinguished by accessory flagellum well developed; coxae 1-5 of similar depth; coxa 4 not excavate posteriorly; uropod 3 peduncle lacking setae or with fine setae on its outer margin, outer ramus recurved apically, bearing 1-3 wire setae and telson with two or more subapical cusps. Ventojassa sp. nov., collected in the Beagle Channel, northern of Despard Island (54º 52´S 68º10´W) at 8-12 m depth, was associated to holdfasts of Macrocystis pyrifera. It is characterized by head with lateral cephalic lobes triangular and apically acute; eyes located far from the apex of ocular lobes; maxilla 1, inner plate naked; gnathopod 1 propodus shorter than carpus; female gnathopod 2 much stronger than 1, carpus subtriangular, very short, propodus subquadrate; male gnathopod 2 stouter than in female, carpus short, saucer-like, propodus very robust, quadrate, with a slight round process at the palmar corner, Barnard, 1970 is composed of six species distributed in Australia, New Zealand, Madagascar, Korea and southern California. Vader and Myers (1996) pointed out that the poorly described and figured V. georgiana (Schellenberg, 1931) cited from southern Tierra del Fuego, Magellan Straits, Antarctica and sub-Antarctic islands could not belong with this genus and they provisionally transferred the species to a new genus (Ruffojassa). Ventojassa is distinguished by accessory flagellum well developed; coxae 1-5 of similar depth; coxa 4 not excavate posteriorly; uropod 3 peduncle lacking setae or with fine setae on its outer margin, outer ramus recurved apically, bearing 1-3 wire setae and telson with two or more subapical cusps. Ventojassa sp. nov., collected in the Beagle Channel, northern of Despard Island (54º 52´S 68º10´W) at 8-12 m depth, was associated to holdfasts of Macrocystis pyrifera. It is characterized by head with lateral cephalic lobes triangular and apically acute; eyes located far from the apex of ocular lobes; maxilla 1, inner plate naked; gnathopod 1 propodus shorter than carpus; female gnathopod 2 much stronger than 1, carpus subtriangular, very short, propodus subquadrate; male gnathopod 2 stouter than in female, carpus short, saucer-like, propodus very robust, quadrate, with a slight round process at the palmar corner,