About Us
Research
People
International Cooperation
News
Education & Training
Join Us
Societies & Publications
Papers
Resources
Links
   Location: Home > Papers

Details of the Publication
Paper Code  
Title   First Middle Devonian galeaspid from the Haikou Formation in Yunnan Province
Authors   MENG Xin-Yuan
Corresponding Author   GAI Zhi-Kun
Year   2022
Title of Journal  
Volume  
Number  
Page  
Abstract  

The Early Emsian Event (EEm Event), the most significant bio-event for Chinese Devonian vertebrates, has significantly impacted on the diversity of galeaspids. The endemic Galeaspida almost became extinct after the Mid-Emsian Event (MEm Event). Only few galeaspid taxa survived from these events, such as Clarorbis apponomedianus from the Eifelian of Guangxi, South China, and an indeterminate galeaspid from the Frasnian of Ningxia, Northwest China. Here, we report the first Middle Devonian galeaspid, Dongfangaspis sp., from the Haikou Formation in Wuding, Yunnan Province. The new material is more suggestive of the type species of Dongfangaspis, D. major, than Laxaspis and Polybranchiaspis in its suborbicular headshield with small inner cornual process, broad and nearly aequilate ventral rim, and about 45 pairs of branchial fossae. Dongfangaspis bears the largest number of branchial fossae ever recorded in galeaspids, which probably play an important role in Dongfangaspis surviving from the EEm and MEm events. The new finding represents the second Middle Devonian fossil record of galeaspids, and extends the chronological range of Dongfangaspis from the Pragian (Early Devonian) to the Eifelian (Middle Devonian).

Full Text  
Full Text Link   http://www.vertpala.ac.cn/CN/10.19615/j.cnki.2096-9899.220613
Others:
Classification:
Source:
Close