A New Mamenchisaurid Dinosaur from the Middle Jurassic of Yuanmou, Yunnan Province, China

doi：

Abstract：

A new mamenchisaurid dinosaur, Eomamenchisaurus yuanmouensis gen et sp. nov. Is erected based on an incomplete skeleton from the Zhanghe Formation, the Middle Jurassic of Yuanmou, Yunnan Province. The new taxon is characterized by absence of pleurocoels in dorsal vertebrae and the dorsal verterbrae with slightly convex anterior articular surfaces, moderately concave posterior articular surfaces; the fourth trochanter is developed posteromedially on the femur; length ratio of the tibia to the femur is approximately 0.64; and the shaft of the ischium is rod-like. Two fused centra of the posterior dorsal vertebrae (the presumed 9th and the 10th dorsal vertebrae) are similar to those in other mamenchisaurid dinosaurs, including Mamenchisaurus hochuanesis, M. youngi and Chuanjiesaurus anaensis. Therefore, fusion of centra of the ninth and the tenth dorsal vertebrae can be recognized as a synapomorphic character of the Mamenchisauridae.

作者：
Author：	L(U) Junchang[1]  LI Tianguang[2]  ZHONG Shimin[2]  JI Qiang[1]  LI Shaoxue[3]
作者單位：	Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Chuxiong Museum, Chuxiong, Yunnan 675000, China Yuanmou Museum, Yuanmou, Yunnan 651300, China
期 刊：	地質學報（英文版）   SCI
Journal：	ACTA GEOLOGICA SINICA(ENGLISH EDITION)
年，卷(期)：	2008, 82(1)
分類號：	P5
Keywords：	Eomamenchisaurus    Mamenchisauridae    Sauropoda    Middle Jurassic    Yunnan Province
機標分類號：	P5
機標關鍵詞：	Middle Jurassic
基金項目：	The Key Laboratory of Stratigraphy and Paleontology,Chinese Academy of Geological Sciences，the National Key Basic Research and Develpment Program