Abstract: On the basis of detailed morphological description and anatomy comparison of two specimens of Keichousaurus hui, the diagnostic characters of Keichousaurus hui have been reconfirmed: small upper temporal fenestra, large orbits, thickened proximal end of ribs and extremely broad ulnae; and more morphological information of Keichousaurus hui is added. The sexual dimorphism of three adults and the ontogenetic stage of a juvenile have been identified through the measurement of different bones. Furthermore, from the paleogeographic information and observation of the embryos, it’s inferred that the reproduction mode is most likely viviparous, but the possibility of ovoviviparity cannot be totally ruled out.

Key words: ontogeny, reproductive mode, Keichousaurus hui, Middle Triassic, Xingyi, Guizhou

摘要： 通过对两件胡氏贵州龙标本进行详细的形态学描述和解剖学对比, 确认标本中所有个体均具有颞孔小、眼孔大、肋骨粗肿、尺骨异常宽阔等典型特征, 并对胡氏贵州龙的形态特征进行了补充。通过骨块测量数据, 可鉴定出3个成年个体的性别和1个幼体的个体发育阶段。结合古地理和胚胎保存信息, 认为胡氏贵州龙的生殖方式可能是胎生, 但尚不能完全排除卵胎生的可能性。

关键词: 个体发育, 生殖方式, 胡氏贵州龙, 中三叠世, 兴义, 贵州