Wikipedia
Smooth skate
Anacanthobatidae, the smooth skates or leg skates, are a family of skate found in the Indian, Pacific and Atlantic oceans.
They lack the dorsal denticles (sharp tooth-like scales) of other rays, hence their name, from Greek an- meaning "without", acantha meaning "thorn", and bathys meaning "deep".
They are bottom dwelling fishes found on the continental slopes of tropical and subtropical waters.