Broad snouted cladoselachian with sensory specialization at the base of modern chondrichthyans.

IF 3 2区 地球科学 Q1 PALEONTOLOGY Swiss Journal of Palaeontology Pub Date : 2023-01-01 DOI:10.1186/s13358-023-00266-6
Christian Klug, Michael Coates, Linda Frey, Merle Greif, Melina Jobbins, Alexander Pohle, Abdelouahed Lagnaoui, Wahiba Bel Haouz, Michal Ginter
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引用次数: 2

Abstract

Throughout the Silurian and Devonian, cartilaginous fish successively evolved their specialized skeletal and dental characteristics, and increasingly refined their sensory systems. The Late Devonian shark taxon Maghriboselache mohamezanei gen. et sp. n. from the eastern Anti-Atlas of Morocco is known from multiple specimens preserving most of its skeletal features, which in some instances are preserved in three dimensions. Key details of the dentition, jaws, and pectoral skeleton are shared with the iconic genus Cladoselache. Phylogenetic analyses place the family Cladoselachidae as the sister group of symmoriiforms and these groups as sister group of the holocephalans. Further phylogenetic results corroborate that the initial evolutionary radiation of crown chondrichthyans occurred within or before the Late Devonian. Remarkably, this new stem holocephalan is equipped with a wide snout and large laterally separated nasal capsules: the earliest known example of this condition in the chondrichthyan and (perhaps) gnathostome record. This suggests sensory specialization approaching that of extant broad-rostrum elasmobranchs and represents a significant addition to increasingly apparent ecomorphological diversity among early chondrichthyans.

Supplementary information: The online version contains supplementary material available at 10.1186/s13358-023-00266-6.

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在现代软骨鱼的基部具有感觉特化的宽吻的爪龙。
在整个志留纪和泥盆纪,软骨鱼先后进化出了专门的骨骼和牙齿特征,并日益完善了它们的感觉系统。摩洛哥东部反阿特拉斯地区的泥盆纪晚期鲨鱼分类群Maghriboselache mohamezanei gen. et sp. n.保存了其大部分骨骼特征的多个标本,在某些情况下以三维形式保存下来。齿列、颌部和胸骨的关键细节与标志性的Cladoselache属相同。系统发育分析表明,枝足科是同形动物的姐妹类群,而这些类群是全头动物的姐妹类群。进一步的系统发育结果证实,冠状软骨鱼的初始进化辐射发生在晚泥盆世或之前。值得注意的是,这只全新的全头类动物有一个宽大的鼻子和巨大的侧向分离的鼻囊:这是已知最早的软骨鱼和(可能)齿龙记录中这种情况的例子。这表明感觉专门化接近于现存的宽喙板鳃,并代表了早期软骨鱼中日益明显的生态形态多样性的重要补充。补充信息:在线版本包含补充资料,下载地址:10.1186/s13358-023-00266-6。
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来源期刊
Swiss Journal of Palaeontology
Swiss Journal of Palaeontology Earth and Planetary Sciences-Paleontology
CiteScore
4.30
自引率
16.70%
发文量
17
审稿时长
4 weeks
期刊介绍: The Swiss Journal of Palaeontology publishes original research and review articles of interest to the international community in the fields of palaeontology, taxonomy and systematics, while recognising at the same time the importance of documenting high-quality palaeontological data in a regional context. Palaeobiology in combination with alpha taxonomy is a core topic of the journal. Submitted papers should have an appeal as wide as possible, directed towards an international readership. Contributions should not have been simultaneously submitted elsewhere, and the overlap of content between related articles should be minimal. Duplications of text and the use of previously published illustrations without adequate citation are unacceptable. If a manuscript has two or more authors, both or all have to sign to confirm they all were involved in the work and have agreed to its submission. The preferred manuscript language is UK English, but consistently used US English is also acceptable. We encourage the publication of proceedings of international meetings as well as special thematic issues. Short contributions and book reviews are also accepted. An international editorial team as well as guest editors guarantee that the thematic issues as well as all articles in regular issues are peer-reviewed and meet the highest standards.
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