来自印度jaisalmer盆地的首个侏罗纪棘龙类足跖动物证据

IF 1.6 3区地球科学 Q2 GEOLOGY

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2023-10-27 DOI:10.54103/2039-4942/20032

ARCHANA SHARMA, FERNANDO E. NOVAS, SANJAY SINGH

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引用次数: 0

摘要

我们从印度西北部拉贾斯坦邦Jaisalmer盆地的中侏罗世海相碳酸盐岩中描述了一个孤立的、几乎完整的足跖趾方阵。掌骨呈三角形，尖形，细长，不对称，背腹侧受压，腹侧扁平，有一个浅半圆形的挖掘，侧面几乎是直的。其形态特征及其比例与目前已知的主要来自白垩纪的棘龙类兽脚亚目的足跖趾趾骨非常相似。双变量和多变量分析支持其与棘龙类的亲缘关系。蹄形指骨初步鉴定为大足龙总科下侏罗纪棘龙纲的一个基部分支。考虑到地层和地理来源，这一贡献可能代表了最古老的棘龙记录。

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FIRST JURASSIC EVIDENCE OF A POSSIBLE SPINOSAURID PEDAL UNGUAL, FROM THE JAISALMER BASIN, INDIA

We describe an isolated, almost complete pedal ungual phalanx from the Middle Jurassic marine carbonate rocks of the Jaisalmer Basin, Rajasthan, north-western India. The ungual bone is triangular shaped, pointed, elongated, asymmetrical, dorsoventrally compressed, ventrally flat, bearing a shallow semi-circular excavation, and almost straight in lateral view. The morphological features, as well as its proportions closely resemble the pedal ungual phalanges of spinosaurid theropods, presently known dominantly from the Cretaceous. The affinity to spinosaurids is supported by bivariate and multivariate analyses. The ungual phalanx is tentatively identified as a basally branching Jurassic spinosaurid under Megalosauroidea. Considering the stratigraphical and geographical provenances, this contribution may represent the oldest record of a spinosaurid.

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来源期刊

Rivista Italiana Di Paleontologia E Stratigrafia 地学-地质学

CiteScore

3.60

自引率

4.30%

发文量

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.