The oldest erymnochelyine turtle skull, Ragechelus sahelica n. gen., n. sp., from the Iullemmeden basin, Upper Cretaceous of Africa, and the associated fauna in its geographical and geological context

IF 1.5 3区地球科学 Q2 PALEONTOLOGY

Geodiversitas Pub Date : 2020-10-22 DOI:10.5252/geodiversitas2020v42a25

France de Lapparent de Broin, L. Chirio, R. Bour

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引用次数: 10

Abstract

ABSTRACT We describe the skull of Ragechelus sahelica, n. gen., n. sp., a pleurodiran Pelomedusoides turtle, the oldest skull known of the Erymnochelyinae. The specimen comes from the surroundings of Indamane village, from a littoral late Maastrichtian level of the Iullemeden sedimentary basin (southwestern Niger, Africa). It is compared on the one hand to the members of the subfamily including remains from the neighboring Ibeceten locality, but from an underlying continental Senonian, and, on the other hand, particularly to the bothremydid Nigeremys gigantea (Bergounioux & Crouzel, 1968), from a littoral Maastrichtian level close to that of Indamane, and from a closer to Indamane locality than Ibeceten. The associated fauna is reviewed in its stratigraphic context. Palaeogeographic considerations and systematic relationships indicate Erymnochelyinae widely diversified, in Africa from that time onwards, up to these days in Madagascar and notably with incursions in Western Europe during the Eocene times.

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最古老的erymnochelyine龟头骨，Ragechelus sahelica n.gen.，n.sp.，来自非洲上白垩纪Iullemmeden盆地，及其地理和地质背景下的相关动物群

摘要：我们描述了一种胸甲Pelomedusoides龟Ragechelus sahelica，n.gen.，n.sp.的头骨，它是已知最古老的Erymochellinae头骨。该标本来自Indamane村周围，位于Iullemeden沉积盆地（非洲尼日尔西南部）的马斯特里赫特阶晚期沿海水平。一方面，它与该亚科的成员进行了比较，包括来自邻近的Ibeceten地区的遗骸，但来自下伏的Senonian大陆的遗骸，另一方面，特别是与bothremydid Nigeremys gigantea（Bergunioux&Crouzel，1968）进行比较，从马斯特里赫特海岸水平接近Indamane，从比Ibeceten更靠近Indamane的位置进行比较。对相关动物群的地层背景进行了回顾。古地理因素和系统关系表明，从那时起，Erymochelyinae在非洲广泛多样化，直到今天在马达加斯加，尤其是在始新世入侵西欧。

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来源期刊

Geodiversitas 地学-古生物学

CiteScore

3.00

自引率

5.60%

发文量

审稿时长

>12 weeks

期刊介绍： Geodiversitas is a fully electronic journal, with a continuous publication stream, devoted to varied aspects of Earth Sciences. It publishes original results particularly on systematics, phylogeny, paleobiodiversity and paleoenvironment. Thematic issues may also be published under the responsibility of a guest editor.