Tataouine盆地新的鳄鱼形齿组合及其对Douiret组地层环境的评论

IF 1 4区 地球科学 Q4 PALEONTOLOGY Annales de Paleontologie Pub Date : 2020-10-01 DOI:10.1016/j.annpal.2020.102424
J. Dridi
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引用次数: 3

摘要

描述了突尼斯东南部Douiret组下段(侏罗纪上段-白垩纪下段)的一种新的鳄鱼形齿组合。这些牙齿根据其诊断形态学特征被分为五种形态型。样本包括牙齿,这些牙齿直到现在还没有被报道过,比如非马基摩猿人的类远龙牙齿,以及没有锯齿的切割边缘的唇舌压缩牙冠。某些微小的形态差异被解释为个体发生或可能与牙齿在颌骨中的位置有关。随后,根据这些牙齿的形态特征定义了三种营养实体,并首次在Tataouine盆地强调了至少三个鳄鱼形类群之间可能的生态位划分。另一方面,对Douiret组的地层背景进行了深入的讨论,以表明地层的不确定性如何显著影响先前重建鳄形目宏观进化史的尝试。当含化石地层的地层背景仍然是一个有争议的话题时,后者应该谨慎对待。
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A new crocodylomorph tooth assemblage from the Tataouine Basin and comments on the stratigraphic context of the Douiret Formation

A new crocodylomorph tooth assemblage from the Lower Member of the Douiret Formation (uppermost Jurassic–lowermost Cretaceous) in southeastern Tunisia is described. These teeth have been grouped into five morphotypes based on their diagnostic morphological features. The sample includes teeth, which have not been reported until now, such as non-Machimosaurini teleosauroid teeth, and labiolingually compressed tooth crowns with cutting edges devoid of serrations. Certain minor morphometric differences have been interpreted as ontogenetic or being possibly related to the position of the teeth in the jaws. Three trophic entities have subsequently been defined on the basis of the morphological characteristics of the teeth, and a possible niche partitioning between at least three crocodylomorph taxa is highlighted for the first time in the Tataouine Basin. On the other hand, the stratigraphic context of the Douiret Formation is thoroughly discussed in order to show how stratigraphic uncertainties could significantly impact previous attempts at reconstructing the macroevolutionary history of Crocodylomorpha. The latter should be treated with caution when the stratigraphic context of the fossil bearing formation remains a subject of debate.

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来源期刊
Annales de Paleontologie
Annales de Paleontologie 地学-古生物学
CiteScore
1.70
自引率
10.00%
发文量
8
审稿时长
>12 weeks
期刊介绍: Créées par Marcellin Boule en 1905, les Annales de Paléontologie publient 4 numéros par an traitant des fossiles animaux et végétaux, dans tous les domaines de la paléontologie incluant : -La Paléoanatomie- La Paléohistologie- La Morphologie fonctionnelle- La Systématique- L''Évolution- La Paléoécologie ... et toute les contributions susceptibles d''améliorer la compréhension des organismes et des environnements éteints.
期刊最新文献
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