来自印度冈瓦南特提斯海岸jaisalmer盆地海相深海的第一个兽脚亚目记录

IF 1.6 3区 地球科学 Q2 GEOLOGY Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2023-01-23 DOI:10.54103/2039-4942/18306
Archana Sharma, Christophe Hendrickx, Sanjay Singh
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引用次数: 1

摘要

中侏罗世兽脚亚目在世界范围内的记录很少,尤其是在冈瓦纳。在印度,侏罗纪兽脚亚目恐龙特别罕见,只有一些孤立的牙齿和一些保存完好的骨头,目前没有来自印度西部中侏罗纪的兽脚亚目恐龙的记录。本文首次报道了在印度西北部Jaisalmer盆地中侏罗世海相碳酸盐岩中发现的兽脚亚目动物齿状物质。该标本是在Jaisalmer组Bathonian Fort段生物碎屑砾岩层中发现的一个不完整的脱落牙冠。对基于牙齿的数据矩阵进行的分支分析显示,分离的冠可能属于非虚骨龙,可能来自角鼻龙,非棘龙类巨龙或异特龙类的中齿。这颗脱落的牙齿提供了证据,证明至少有一个中型到大型兽脚亚目动物分类群在中侏罗世生活在印度西北部的特提斯海岸。这一发现标志着Jaisalmer盆地成为印度侏罗纪冈瓦纳恐龙遗迹的一个有希望的新地区。
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FIRST THEROPOD RECORD FROM THE MARINE BATHONIAN OF JAISALMER BASIN, TETHYAN COAST OF GONDWANAN INDIA
Middle Jurassic theropods have a scanty record worldwide, especially from Gondwana. In India, where Jurassic theropods are particularly rare and only represented by a few isolated teeth and some badly preserved bones, there is currently no record of theropods from the Middle Jurassic of western India. Here we report the first theropod dental material from Middle Jurassic marine carbonate rocks of the Jaisalmer Basin, north-western India. The specimen consists of an incomplete shed tooth crown recovered from bioclastic intraformational conglomerate bed of the Bathonian Fort Member of the Jaisalmer Formation. A cladistic analysis performed on a dentition-based data matrix revealed that the isolated crown likely pertained to a non-coelurosaur averostran possibly from the mesial dentition of a ceratosaurid, a non-spinosaurid megalosauroid, or an allosauroid. This shed tooth provides evidence that at least one taxon of medium to large-bodied theropod lived on the Tethyan coast of NW India during the Middle Jurassic. This contribution marks the Jaisalmer Basin as a new promising area in India for dinosaurian remains from the Jurassic Gondwana.
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来源期刊
CiteScore
3.60
自引率
4.30%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Rivista Italiana di Paleontologia e Stratigrafia was founded in 1895. It publishes original papers dealing with all fields of paleontology and of stratigraphy, from Italy and the Mediterranean to the Tethys, as well across the globe from China to North America.
期刊最新文献
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