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 Epub Date: 2023-03-28 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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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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宽吻巨口鱼类,在现代软骨鱼类的基础上实现了感官特化。
在整个志留纪和泥盆纪,软骨鱼类相继进化出了其特化的骨骼和牙齿特征,并日益完善了其感官系统。来自摩洛哥东部反阿特拉斯的晚泥盆世鲨鱼类群 Maghriboselache mohamezanei gen.其牙齿、下颌和胸骨的主要细节与标志性的 Cladoselache 属相同。通过系统发生学分析,Cladoselachidae 科是鞘翅目的姊妹类群,而这些类群则是全头类的姊妹类群。进一步的系统发育结果证实,冠软骨鱼类最初的进化辐射发生在晚泥盆世或之前。值得注意的是,这种新的茎状全头类具有宽大的吻部和横向分开的大鼻囊:这是软骨鱼类和(也许是)团头鲂记录中出现这种情况的最早例子。这表明其感官特化程度接近于现存的宽喙伶鼻纲鱼类,是对早期软骨鱼类日益明显的形态多样性的重要补充:在线版本包含补充材料,可查阅 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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