Abstract
This paper proposes to understand what are the morphological characteristics and evolutionary patterns of pre-caudal musculature within Carcharhinidae and Sphyrnidae (Carcharhiniformes: Elasmobranchii). To do so, dissection of the caudal region of members of these families will be made to observe their pre-caudal musculature; it will be observed, drawn and compared to elucidate the issues…