河南淅川早始新世一新原鸟

河南淅川这一新原鸟类化石,根据如下特征:胫跗骨外关节髁的外边缘超过胫跗骨的外边缘、内外两髁间成一“V”字形沟、内关节髁的内面具一近似“T”字形隆凸,骨质腱桥上边缘外斜、下边缘内斜,腱桥靠近胫跗骨内缘等,订一新属种:淅川中原鸟。中原鸟的时代为早始新世,它代表到目前为止我国时代最早和巨型鸟类——不飞鸟目的唯一材料。

NEW FORM OF THE GASTORNITHIDAE FROM THE LOWER EOCENE OF THE XICHUAN,HONAN

In the 1976,a tibiotarsus of fossil bird was obtained by a field party of theInstitute from Xichaun district,Honan Province.This is the first time that fossil birddiscovered from the Lower Eocene of China.Materials was found from the bed of Yu-Huang-Ding Series.Described in this paper represent 1 genus and 1 specis:Zhongyuanus xichuanensis gen.et sp.nov.Diagnosis:The outer articular condyle extends beyond the line of the outer sideof tibiotarsus;outer articular condyle forms a “V” angle with that of the inner one;inner surface and inner condyle forms a “T” tuberosity;upper margin of osseoussupratendinal bridge projecting outwards,Lower margin of bridge projecting inwards;osseaus supratendinal bridge was situated towards inner side of tibiotarsus.