黄带拟鲹和星云扁鲨骨骼系统比较解剖学研究OACSCD

As the skeleton is a crucial organ in fish,to understand its evolution,we explored the similarities and differences among the skeletal systems of Osteichthyans and Chondrichthyans.This study utilized X-rays and CT scanning to observe and document the skeletal systems of the white trevally(Pseudocaranx dentex)and the clouded angelshark(Squatina nebulosa).The endoskeleton of the two species can be divided into axial and appendicular elements.In S.nebulosa,the skeleton was generally less mineralized,and the neurocranium was composed solely of a cartilaginous structure and lacked a large dermal bone.Moreover,P.dentex possessed four basipterygia in its pectoral fins,whereas S.nebulosa exhibited only three,a condition more similar to that of early-jawed vertebrates.In addition,symmetrically arranged,highly calcified lateral-line scales were observed on the caudal peduncle of P.dentex,which may be related to its locomotive behavior.In conclusion,this study enriches the fundamental data on the skeletal anatomy of marine fish and provides novel insights into the evolutionary development of the fish en-doskeleton.