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.2012.[J].Acta Geologica Sinica(),86(4):791-798
New Macroscopic Problematic Fossil from the Early Cambrian Yanjiahe Biota, Yichang, Hubei, China    Download PDF
GUO Junfeng1  2  *  LI Yong1  HAN Huiping3  OU Qiang4  ZHOU Jianren1  ZHENG Yajuan1
1 Key Laboratory of Western Mineral Resources and Geological Engineering of the Ministry of Education, School of Earth Science and Resources, Chang’an University, Xi’an 710054, China 2 State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeobiology, Chinese Academy of Sciences, Nanjing 210008, China 3 Changqing Oilfield Company, Petrochina, Xi′an 710018, China 4 Early Life Evolution Laboratory, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
This research was funded by National Basic Research Program of China (Grant No. 40902007), the Special Fund for Basic Scientific Research of Central Colleges, Chang’an University, China (Grant Nos CHD2011TD005, CHD2011TD020, CHD2010JC074, CHD2009JC0018), the China Postdoctoral Science Foundation (Grant No. 20100471020), and the Doctoral Fund of Ministry of Education of China (Grant No. 20100205110003).
DOI:
Abstract:
      Yanjiahella gen. nov., a distinctive fossil taxon from the Early Cambrian Yanjiahe Biota in Yichang, Hubei Province, is characterized by: 1) an overall body plan composed of a stalk and a calyx (also arms in some species); 2) a stalk with closely spaced, transverse wrinkles and a medial, longitudinal ridge; and 3) a calyx preserved with three-dimensional radiating striations, as well as a probable madreporite in some specimens. Three species that can be assigned to this genus, which are Y. ancarpa sp. nov., Y. monocarpa sp. nov., and Y. biscarpa sp. nov. Yanjiahella is comparable to certain echinoderm taxa in terms of morphology and some biological structures, which might indicate the early evolution and diversification of ancestral echinoderm lineages from the early Early Cambrian Yangtze Platform. The discovery of putative echinoderms in the Yanjiahe Biota provides significant clues about the origination and evolution of the deuterostome phylum Echinodermata.
Key words:Yanjiahella, echinoderm-like organisms, Terreneuvian, Yanjiahe Biota, Yichang, Hubei
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