Abstract
Sharks and rays are cartilaginous fish belonging to the subclass Elasmobranchii. Rays, characterized by a dorsoventrally flattened body, belong to a monophyletic group that is divided into four orders: Rajiformes, Rhinopristiformes, Torpediniformes, and Myliobatiformes. Atlantoraja cyclophora and Rioraja agassizii are Rajiformes that live in sympatry along the Southeast coast of Brazil. T…