Cartilaginous skeleton marine fish. The disc (body and scapular joint) is wide and rhomboidal with pointed "wings". Long snout ans numerous teeth in each jaw. The skin of the dorsal face is thorny in adults and smooth in the young. The back is grayish brown and the ventral face whitish.
- Area 3: America, South - Inland waters
- Area 41: the Southwestern part of the Atlantic Ocean
- Area 81: the Southwestern part of the Pacific Ocean
- Area 87: the Southeastern part of the Pacific Ocean
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