中国鳐类脑颅的研究

作者解剖观察了33种,隶于4目、7亚目、15科、19属的中国鳐类脑颅的形态。研究结果认为:锯鳐目和鳐目是原始类群,它们均具吻软骨,其中圆犂头鳐科和团扇鳐科是特化类群。电鳐目亦具吻软骨,它们是特化和退化类群。在较高等的鲼目则无吻软骨。依据鳐类不同的分类阶元,其脑颅亦各具有不同的式型。

STUDY OF THE NEUROCRANIUM OF BATOMORPHA OF CHINA

This paper deals with the morphology of the neurocranium of skates and rays of China. Anatomical investigations are carried out on 33 species, belonging to 19 genera, 15 families; 7 suborders and 4 orders.The Pristiformes and Rajiformes are primitive groups. They all have rostral cartilages (figs. 1-5), of which the Rhinidae and Platyrhinidae are specialized groups, The Torpedi-niformes also have rostral cartilages; they are specilized and degenerated groups (fig. 9). There are no rostral cartilages in higher groups of Myliobatiformes (figs. 6-8). According to the different groups of taxa of Batomorpha, the neurocranium has different patterns. A key to the families of Chinese skates and rays is tentatively presented.