The narrownose smooth-hound is a houndshark of the family Triakidae. It is found on the continental shelves of the subtropical southwest Atlantic, from southern Brazil to northern Argentina, between latitudes 30° S and 44° S, at depths between 60 m to 195 m. It can reach a length of 74 centimeters.
The narrowmouthed catshark is a catshark of the family Scyliorhinidae, found from central Chile around the Straits of Magellan, to Argentina between latitudes 23° S and 56° S, at depths down to about 180 m (600 ft) in the Atlantic Ocean and about 360 m (1,200 ft) in the Pacific. It can grow to a length of up to 70 cm (28 in). The reproduction of this catshark is oviparous.
The thickbody skate is a species of fish in the family Rajidae found off the coasts of Argentina, Chile, and Uruguay. Its natural habitat is open seas.
The eyespot skate is a species of fish in the family Arhynchobatidae. It is found in Argentina, Brazil, and Uruguay. Its natural habitats are open seas and shallow seas.
The Brazilian blind electric ray, is a species of fish in the family Narcinidae endemic to Brazil. Its natural habitat is open seas.
The thintail skate is a species of fish in the family Rajidae. It is endemic to Brazil. Its natural habitat is open seas.
The onefin skate is a species of fish in the family Gurgesiellidae. It is endemic to Brazil. Its natural habitat is open seas, specifically on the bottom along the continental slope between 400 and 800 metres deep. It is a bycatch of fishing boats targeting shrimp and Argentine squid, which has contributed to significant population declines among G. dorsalifera.
The blotched sandskate is a species of fish in the family Arhynchobatidae. It is found off the coasts of Argentina, Brazil, and Uruguay. And sometimes in Norway. Its natural habitat is open seas.
The zipper sandskate is a species of fish in the family Arhynchobatidae. It is found in the Atlantic Ocean off the coasts of Argentina, Brazil, and Uruguay. Its natural habitat is open seas.
The shortfin sandskate is a species of fish in the family Arhynchobatidae. It is found off the shores of Argentina and Chile. Its natural habitat is open seas.
The smallthorn sandskate is a species of fish in the family Arhynchobatidae. It is found off the coasts of Argentina and Chile. Its natural habitat is open seas.
The Brazilian skate is a species of fish in the family Rajidae. It is found in Brazil and Chile. Its natural habitat is open seas. It is not well known but is thought to be threatened by bycatch of Patagonian toothfish.
The bignose fanskate is a species of fish in the family Arhynchobatidae. It is found off Argentina, Brazil, and Uruguay. Its natural habitats are open seas and shallow seas.
The smallnose fanskate is a species of fish in the family Arhynchobatidae. It is found off the coasts of Argentina, Brazil, Chile, and Uruguay. Its natural habitats are open seas, shallow seas, and estuarine waters.
The filetail fanskate is a species of fish in the family Arhynchobatidae. It is endemic to the Pacific coast of Chile. Its natural habitat is open seas.
The shortnose guitarfish is a species of fish in the Rhinobatidae family found in the southwest Atlantic in coastal parts near sandy sea floors of southern Brazil, through Uruguay, to northeast Argentina. It reaches a length of 66 cm (2.17 ft). Their diet consist of Crabs, worms, clams and small fishes. The guitarfish has become critically endangered because of the rapid decline caused by overfishing.
The southern thorny skate is a species of fish in the family Rajidae. It lives off the coast of Argentina and Uruguay, and around the Falkland Islands in depths ranging from 51 to 642 m. Its maximum size is 69 cm. It lays oblong egg capsules with horn-like projections at the corners which are laid in sandy or muddy flats. The eggs measure 86.4 mm in length and 56.2 mm in width.
The white-dotted skate is a species of skate in the family Arhynchobatidae. It is found in the south-western Atlantic off the coast of Uruguay, Argentina and the Falkland Islands and uncommonly off Chile in the south-eastern Pacific Ocean, at depths ranging from 55 to 861 metres. Males reach maturity at the age of about 11 years and females about 10 years. At maturity the total length of males is about 62.8 cm and females 65.3 cm. The oldest reported specimen was 17 years old. The maximum length has been estimated to be almost one metre. It is oviparous. Egg capsules are oblong having horned corners, the horns at the back end appear first and are longer, and thinner than the front ones. Capsules are barrel-shaped, quite smooth, yellow-brown when freshly laid, but they get darker. Egg laying has been observed year-round, but most frequently in autumn and winter. The animal eats mainly benthopelagic gammarids and polychaetes and also isopods. Juvenile white-dotted skates eat mostly gammarid amphipods, while adults eat mostly polychaetes.
The shortnose eagle ray is a species of eagle ray that lives in the southwestern Atlantic Ocean off Brazil, Uruguay and Argentina.
