Journal of Earth Science

, Volume 23, Issue 1, pp 33-40

First online:

A new eosauropterygian (Diapsida: Sauropterygia) from the Middle Triassic of Luoping, Yunnan Province

  • Long Cheng程龙Affiliated withKey Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of GeosciencesWuhan Institute of Geology and Mineral Resources
  • , Xiaohong Chen陈孝红Affiliated withWuhan Institute of Geology and Mineral Resources Email author 
  • , Xiongwei Zeng曾雄伟Affiliated withWuhan Institute of Geology and Mineral Resources
  • , Yongjian Cai蔡永健Affiliated withWuhan Institute of Earthquake Engineering

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A new eosauropterygian, Largocephalosaurus polycarpon gen. et sp. nov., was described based on a skeleton from the Middle Triassic of Luoping (罗平), Yunnan (云南) Province, southwestern China. The new taxon is characterized by a big skull, paired frontal, laterally expanded upper temporal fossa, anterior process of squamosal entering orbit, robust teeth with basally expanded crown and blunt tip, short cervical region, distinctly elongated transverse process of the dorsal vertebrae, short and broad dorsal ribs, stout gastralia, scapula with distinctly posterodorsally extending blade, distinctly robust humerus, eleven carpal ossifications, and a manual fomula of 2-3-4-5-5. A phylogenetic analysis suggests that Largocephalosaurus is the basal-most member of a clade including Wumengosaurus, European pachypleurosaurs, and Nothosauroidea.

Key Words

Yunnan Triassic Guanling Formation Sauropterygia