Systematics, ontogeny and palaeobiogeography of the genus Orthacanthus (Diplodoselachidae, Xenacanthiformes) from the lower Permian of France

IF 2.3 2区 地球科学 Q1 PALEONTOLOGY
Vincent Luccisano, Alan Pradel, R. Amiot, J. Pouillon, René Kindlimann, J. Steyer, G. Cuny
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引用次数: 1

Abstract

The erection of Orthacanthus buxieri Heyler & Poplin from the lower Permian locality of Buxières‐les‐Mines (Allier, France) was based on a poorly prepared specimen with only a few parts of its anatomy visible. The supposedly related teeth have been regarded as possibly belonging to O. kounoviensis, a species already known from the Carboniferous–Permian of Germany and Czech Republic. The holotype of O. buxieri requires extensive preparation before it can be revised, but the description of Orthacanthus isolated teeth and dorsal spines from Buxières‐les‐Mines nevertheless provides useful information, especially given that no precise description of this material has been provided so far. The aim of this description is to better understand the evolutionary history of the French Orthacanthus and its relationships with the other European species. The studied material is assigned to O. kounoviensis. This is the latest occurrence of this genus in Europe and the presence of both juvenile and adult teeth indicate that Buxières‐les‐Mines was probably one of the last suitable environments for its reproduction. We also identify Orthacanthus cf. kounoviensis from the Muse oil‐shale bed, the first record of this genus in the Autun Basin. This brings into question the relationships between the different Carboniferous–Permian basins of the Northern Massif Central and suggests that they could still have been in connection during the lower Permian, in contrast to the central European basins, which seem to be more isolated from each other.
法国下二叠纪原棘属的系统学、个体发育和古生物地理学
在buxi res‐les‐Mines (Allier,法国)的下二叠纪地区,直立的Orthacanthus buxieri Heyler & Poplin是基于一个制备不良的标本,其解剖结构只有少数部分可见。据推测,这些牙齿可能属于O. kounoviensis,这是一种已经在德国和捷克的石炭纪-二叠纪发现的物种。在对其进行修订之前,O. buxieri的全型需要大量的准备工作,但是对来自buxires‐les‐Mines的Orthacanthus分离的牙齿和背刺的描述仍然提供了有用的信息,特别是考虑到迄今为止还没有提供对该材料的精确描述。这一描述的目的是为了更好地了解法国直棘龙的进化史以及它与其他欧洲物种的关系。所研究的材料被指定为kounovisis。这是该属在欧洲的最新发现,幼齿和成齿的存在表明buxi res‐les‐Mines可能是其繁殖的最后适宜环境之一。我们还在Muse油页岩层中发现了Orthacanthus cf. kounoviensis,这是该属在秋季盆地的首次记录。这给北部中部地块不同石炭纪-二叠纪盆地之间的关系带来了疑问,并表明它们在二叠纪下仍可能联系在一起,与中欧盆地形成鲜明对比,后者似乎彼此更加孤立。
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来源期刊
Papers in Palaeontology
Papers in Palaeontology PALEONTOLOGY-
CiteScore
4.50
自引率
4.30%
发文量
55
期刊介绍: Papers in Palaeontology is the successor to Special Papers in Palaeontology and a journal of the Palaeontological Association (www.palass.org). The journal is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. Papers in Palaeontology is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. As a sister publication to Palaeontology its focus is on descriptive research, including the descriptions of new taxa, systematic revisions of higher taxa, detailed biostratigraphical and biogeographical documentation, and descriptions of floras and faunas from specific localities or regions. Most contributions are expected to be less than 30 pp long but longer contributions will be considered if the material merits it, including single topic parts. The journal publishes a wide variety of papers on palaeontological topics covering: palaeozoology, palaeobotany, systematic studies, palaeoecology, micropalaeontology, palaeobiogeography, functional morphology, stratigraphy, taxonomy, taphonomy, palaeoenvironmental reconstruction, palaeoclimate analysis, biomineralization studies.
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