The zipper sandskate (Psammobatis extenta) 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. Their diet consists of Crustaceans and other small creatures. The distributions of their prey changes with the seasons, whatever is available at the time is what they feed on (Muto et al. 2001).
2. Muto, E Y ; Soares, L S ; Goitein, R. (2001) Food resource utilization of the skates Rioraja agassizii (Müller & Henle, 1841) and Psammobatis extenta (Garman, 1913) on the continental shelf off Ubatuba, South-eastern Brazil. Brazilian journal of biology, Vol.61 (2), p.217-238.https://www.scielo.br/j/rbbio/a/ZX5HNvLrv6ct3Zwqntgnf3j/?lang=en&format=pdf