关于董氏狼鳍鱼(Lycoptera tungi)的种上归类

本文重新研究了董氏狼鳍鱼 (Lycoptera tungi Liu et al 1963).将产自宁夏隆德石窑寺的董氏狼鳍鱼 V2323 号标本从狼鳍鱼属 (Lycoptera) 中分出来,归入华夏鱼属 (Huashia), 修定为董氏华夏鱼 (Huashia tungi (Liu et al.)).同时对华夏鱼科 (Huashiidae) 的系统位置作了初步讨论.

ON THE GENERIC STATUS OF LYCOPTERA TUNGI

Lycoptera tungi was named by Liu et al. in 1963 on the basis of the type specimen (IVPP V2323.3) from Shiyaosi Lungde, Ningxia. At the same time the materials (IVPP V2324. 1-3) from Wucunpu Huating, Gansu were incorporated into it as well. I have reviewed Lycoptera tungi and think all of the fossil fishes (IVPP V2323) collected from Shiyaosi should be separated from Lycoptere and placed in the genus Huashia. Huashia tungi (Liu et al.) is undoubtedly a member of Huashiidae because of the absence of the temporal fenestra and the supramaxilla, the upper mouth border formed mainly by the premaxilla, the toothless maxilla excluded partially from the gape and the edentulous parasphenoid etc. in Huashia tungi (Liu et al.) Some other specimens (IVPP V2324. 1-3) included in Lycoptera tungi belong to Lycoptera. The characteristics of the Huashiidae (the caudal fin contains 18 principal rays; a full neural spine on PUI; a large posteroventral infraorbital bone present) demonstrates that it belongs to the Osteoglossomorpha. In this group, the Huashiidae resembles Lycoptera and Hiodon more closely in three straplike uroneurals extending forward beyond U2. So the Huashiidae is regarded as a group of primitive osteoglossiform fishes which differ from all families of this group by several autapomorph characteristics (The premaxilla forms the upper mouth border and the maxilla is partially excluded from the mouth gape. The inferior limb of the preoperculum is long.)