Comparative anatomy of the clasper of catsharks and its phylogenetic implications (Chondrichthyes: Carcharhiniformes: Scyliorhinidae),Journal of Morphology

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Comparative anatomy of the clasper of catsharks and its phylogenetic implications (Chondrichthyes: Carcharhiniformes: Scyliorhinidae)
Journal of Morphology ( IF 1.5 ) Pub Date : 2020-04-09 , DOI: 10.1002/jmor.21123
Karla D A Soares ₁

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The presence of claspers is one of the main characteristics of the cartilaginous fishes, but its variations across taxa have received limited use in shark systematics and have generally been neglected in descriptions of species. Clasper descriptions are available only for a few catshark species and most of these are focused only in external morphology. Besides that, divergences regarding the identification of some structures persist in the literature emphasizing the need of more encompassing morphological comparative analyses on claspers of scyliorhinids. In this study, claspers structures of almost all catshark genera were examined, described, and illustrated (except Akheilos and Pentanchus) and comments on their phylogenetic significance are provided. Some characters such as degree of development of rhipidions and terminal dermal cover, occurrence, position and size of accessory marginal and terminal cartilages proved to be useful for taxonomic purposes and their significance along carcharhiniforms systematics needs to be further investigated. RESEARCH HIGHLIGHTS: Clasper morphology of catsharks is described and compared and its systematic significance is discussed here. External morphology and skeleton components of claspers vary widely among scyliorhinids and may be useful in phylogenetic analyses.

中文翻译：

catshark clasper 的比较解剖学及其系统发育意义（软骨鱼类：Carcharhiniformes：Scyliorhinidae）

鲷鱼的存在是软骨鱼类的主要特征之一，但其在不同分类群中的变异在鲨鱼系统学中的使用有限，并且在物种描述中通常被忽略。Clasper 描述仅适用于少数猫鲨物种，其中大部分仅关注外部形态。除此之外，关于某些结构识别的分歧在文献中仍然存在，强调需要对 scyliorhinids 的 claspers 进行更全面的形态比较分析。在这项研究中，检查、描述和说明了几乎所有猫鲨属的钩爪结构（Akheilos 和 Pentanchus 除外），并提供了对其系统发育意义的评论。某些特征如菱形的发育程度和终末真皮覆盖，辅助边缘和末端软骨的发生、位置和大小被证明对分类学目的是有用的，需要进一步研究它们在 Carcharhiniforms 系统学中的意义。研究亮点：本文描述并比较了猫鲨的 Clasper 形态，并讨论了其系统意义。在 scyliorhinids 中，claspers 的外部形态和骨骼成分差异很大，可能有助于系统发育分析。

更新日期：2020-04-09

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