The genus Psammobatis is endemic to South America, and three of its species are sympatric along the Chilean coast. Their morphological similarity as well as the lack of type material of P. scobina, has made its taxonomic identification especially complex.

The Raspthorn Sandskate (Psammobatis scobina) is a small (to 50 cm total length) skate found in the Southeast Pacific Ocean endemic to Chile, although it possibly occurs in the Falkland Islands (Malvinas) in the Southwest Atlantic. It is demersal on the

The Smallthorn Sandskate (Psammobatis rudis) is a small (to 53 cm total length) skate that occurs in the Southeast Pacific and Southwest Atlantic from Coquimbo, Chile south around Cape Horn and north to southern Buenos Aires, Argentina, possibly including