Micronautilus n. gen., a new dwarf Bathonian (Middle Jurassic) nautilid from Western France

IF 1.2 4区地球科学 Q3 PALEONTOLOGY

Comptes Rendus Palevol Pub Date : 2023-07-04 DOI:10.5852/cr-palevol2023v22a22

P. Branger

引用次数: 0

Abstract

The new genus Micronautilus n. gen. (type species Micronautilus evolutus n. gen., n. sp.) is described and assigned to the family Paracenoceratidae Spath, 1927. Known from only two species with a very small shell, this taxon is regarded to represent a natural lineage within the family. As currently known, the occurrence of Micronautilus n. gen. is limited to the Bathonian of Western France, extending from the Zigzag Zone to the Retrocostatum Zone. The origin of Micronautilus n. gen. is likely to lie in the upper Bajocian group of nautilids assigned to ‘Cenoceras’ fuscum (Crick, 1898). Paleoenvironmental data suggest that the dwarfism of this new taxon cannot be interpreted as a consequence of an isolated population or any specific environmental conditions.

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小鹦鹉螺(Micronautilus n. gen.)，法国西部一种新发现的矮巴统(中侏罗世)鹦鹉螺

新属(型种:Micronautilus evolutus n.gen .， n.sp .)被描述并归属于Paracenoceratidae Spath, 1927年。已知的只有两个种，壳非常小，这个分类群被认为是科内的一个自然谱系。目前所知道的是，“小鹦鹉螺”只出现在法国西部的巴底纪，从z形带一直延伸到后肋statum带。微型鹦鹉螺(Micro-nautilus)的起源很可能是在巴约西亚(Bajocian)鹦鹉螺纲(Cenoceras fuscum)的上层(Crick, 1898)。古环境数据表明，这个新分类群的矮小性不能被解释为孤立种群或任何特定环境条件的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Comptes Rendus Palevol 地学-古生物学

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

17.6 weeks

期刊介绍： Comptes Rendus Palevol is a fully electronic and peer-reviewed journal, with a continuous publication stream, devoted to palaeontology, prehistory and evolutionary sciences. It publishes original research results, in French or English, in the following domains: systematic and human palaeontology, prehistory, evolutionary biology and macroevolution, and history of sciences. Thematic issues may also be published under the responsibility of a guest editor. All articles published in Comptes Rendus Palevol are compliant with the different nomenclatural codes. A copyright assignment will be signed by the authors before publication.