DOI:10.19762/j.cnki.dizhixuebao.2020028
 
New forefin specimens and comparison of Early Triassic Ichthyopterygia from the Hubei Province
Author NameAffiliationE-mail
ZOU Yarui 1) Hubei Institute of Geosciences, Wuhan, 430038 569007425@qq.com 
ZHAO Bi 1) Hubei Institute of Geosciences, Wuhan, 430038  
CHEN Gang 1) Hubei Institute of Geosciences, Wuhan, 430038  
LI Jiangli 1) Hubei Institute of Geosciences, Wuhan, 430038  
CHENG Long 2) Central South China Innovation Center for Geosciences, Wuhan, 4302053) Wuhan Center of China Geological Survey, Wuhan, 430205  
YAN Chunbo 2) Central South China Innovation Center for Geosciences, Wuhan, 4302053) Wuhan Center of China Geological Survey, Wuhan, 430205  
TAN Qiuming 1) Hubei Institute of Geosciences, Wuhan, 430038  
Abstract:Chaohusaurus geishanensis, an Early Triassic ichthyopterygia found in China, shares similar forefin and skull structures and reveals a systematic relationship to Grippia in Europe. However,further intercomparison was difficult because specimens subsequently discovered in China were either highly specialized in forelimb or incomplete. Here, two nearly complete and non—specialized forelimbs of Chaohusaurus found in the Lower Triassic Jialingjiang Formation in Hubei Province are described with related information on basal ichthyopterygians in China. Morphological comparison reveals that the general features of the Early Triassic Chaohusaurus in the Hubei Province were close to Ch. geishanensis of the same genus, but distinctly different from Ch. chaoxianensis. Its features such as relatively large individual size, intermediate squeezing and deformation and pisiform development shares some similarities with Grippia,Utatsusaurus,Parvinatator and other Early Triassic ichthyopterygians. Based on these results we propose that there were possibly two directions for evolution of the Early Triassic ichthyopterygians. After the end- Permian mass extinction (EPME), ichthyopterygians appeared and soon differentiated during the Olenekian. Some large individuals without specialized forelimbs but with strong motor ability migrated between different regions. However, other small individuals with specialized forelimbs and weak motor ability became a local (eastern Tethys) independently evolving branch. However,the clarification of the phylogenetic relationship between them, and the monophyly of Chaohusaurus needs to be tested by future studies.
keywords:Hubei  Early Triassic  Jialingjiang Formation  Ichthyopterygia  forelimb
View Full Text  View/Add Comment  Download
You are a visitor1525710  Beijing ICP license No. 05032737-7; Beijing public network security license No.
All Rights Reserved:《Acta Geologica Sinica》(Chinese Version)
The Competent Units:China Association for Science and Technology ; The Organizer :Geological Society of China
Address: No. 26 Baiwanzhuang Street, Xicheng District, Beijing 100037, China; Zip Code :100037 The Phone :+86(10) 6831 2410, +86(10) 6899 9025 E-mail: dizhixuebao@163.com
Supported by Beijing Qinyun Science and Technology Development Co., Ltd 
WeChat