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NAIL-SHAPED SCLERITE FOSSILS FROM THE LOWER CAMBRIAN XIHAOPING MEMBER OF FANGXIAN,HUBEI PROVINCE
Author(s): NA Lin and LI Guoxiang State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008
Pages: 35-
51
Year: 2011
Issue:
3
Journal: Acta Micropalaeontologica Sinica
Keyword: 钉形骨片; 织金钉类; 寒武钉类; 西蒿坪段; 下寒武统; 房县; 湖北;
Abstract: 本文对采自湖北房县三座庵剖面下寒武统西蒿坪段的钉形骨片(nail-shaped)化石进行了研究,系统厘定和描述了2属2种,分别为Parazhijinites guizhouensis和Cambroclavus fangxianensis;其中以C.fangxianensis骨片化石最为丰富,由三种类型的骨片组成,它们可能分属于动物躯体不同部位的骨片。寒武纪早期钉形骨片化石主要包括织金钉类(zhijinitids)和寒武钉类(cambroclavids),织金钉类骨片在其动物躯体表面呈零散分布,寒武钉类骨片在其动物躯体表面呈联锁(骨片基部相互关联)分布。由于两类骨片外形非常相似,它们常被归入一个科(Zhi-jinitidae),但这种形态分类的可靠性尚有疑问,因为不同类别的动物可以生长有形态近似的骨片,而骨片的形态相似性在动物分类方面的作用有时可能被人为地扩大了。由于缺乏软躯体特异保存化石的发现,尚难确定这些骨片化石究竟与哪类动物相关,暂作分类未定的骨片化石。
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