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辽宁下白垩统阜新组真兽类哺乳动物新带氏远藤兽(Endotherium niinomii Shikama, 1947)再研究

发表日期:2018-02-26来源:放大 缩小

编辑:王元青楠桥直  李传夔濑户口烈司高春玲刘金远

摘要:根据正型标本的印痕和翻制的模型,对产于辽宁阜新新邱阜新组的早白垩世真兽类哺乳动物新带氏远藤兽(Endotherium niinomii Shikama, 1947)进行了重新研究。对照Shikama (1947) 的原始描述,将E. niinomii的主要特征归纳为:下臼齿从m1m3逐渐变小;下三角座和下跟座的高差不是很大;下臼齿的齿尖钝;下原尖比下前尖和下后尖大, 并且下前尖和下后尖高度相近;可能有5个前臼齿, 并且p3不明显变小。这些特征组合足以将该属与其他的白垩纪真兽类相区别,因此认为Endotherium niinomii是一个有效种。 
关键词:辽宁阜新, 早白垩世, 阜新组, 哺乳动物, 真兽类, 远藤兽 

 Reappraisal of Endotherium niinomii Shikama, 1947, a eutherian mammal from the Lower Cretaceous Fuxin Formation, Fuxin-Jinzhou Basin, Liaoning, China

WANG Yuan-Qing, KUSUHASHI Nao, JIN Xun, LI Chuan-Kui, SETOGUCHI Takeshi, GAO Chun-Ling, LIU Jin-Yuan

Abstract   Reinvestigation of the Early Cretaceous eutherian mammal Endotherium niinomii Shikama, 1947, based on the impressions of the type specimen, casts made from the impressions, and the original description, indicates that E. niinomii is characterized by the following characters: decrease in size from the m1 to the m3; a moderate height difference between the trigonid and talonid of lower molars; blunt lower molar cusps; the protoconid being the largest among the trigonid cusps; the paraconid being as tall as the metaconid; the p3 not being obviously reduced; and possible possession of five lower premolars. These characteristics clearly distinguish E. niinomii from other known Cretaceous eutherians, and support its taxonomic identity as a valid taxon. 
Key words   Fuxin, Liaoning; Early Cretaceous; Fuxin Formation; Mammalia, Eutheria, Endotherium niinomii  

 

 

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