Phylogenetic significance of clasper morphology of electric rays (Chondrichthyes: Batoidea: Torpediniformes),Journal of Morphology

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Phylogenetic significance of clasper morphology of electric rays (Chondrichthyes: Batoidea: Torpediniformes)
Journal of Morphology ( IF 1.5 ) Pub Date : 2021-01-09 , DOI: 10.1002/jmor.21315
Renan A Moreira ₁ , Marcelo R de Carvalho ₁

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Torpediniformes (electric rays) is a monophyletic group strongly supported by morphological and molecular phylogenetic studies. The claspers of electric rays, however, are poorly documented in comparation to the clasper of other batoids, especially skates, and the knowledge of their anatomical variation is restricted to the description of a few species. The present paper analyzes the external and skeletal clasper anatomy of electric rays and reports newly discovered characters that can be useful for taxonomic diagnoses and higher-level systematic studies. The family Torpedinidae exclusively presents the integumental flap, a poorly calcified clasper skeleton, and a dorsal marginal cartilage with a medial flange on its distal portion. Derived or diagnostic characters were not found in the clasper of the reportedly non-monophyletic families Narcinidae and Narkidae; however, the claspers of species and genera of narcinids and narkids present different anatomical patterns that can be useful for taxonomic and phylogenetic studies.

中文翻译：

电鳐（Chondrichthyes：Batoidea：Torpediniformes）鲷形态的系统发育意义

Torpediniformes（电鳐）是一个单系群，受到形态学和分子系统发育研究的大力支持。然而，与其他蝙蝠类动物（尤其是冰鞋）的抓握相比，电射线抓握的记录很少，而且对它们的解剖变异的了解仅限于对少数物种的描述。本文分析了电射线的外部和骨骼扣件解剖结构，并报告了新发现的特征，这些特征可用于分类学诊断和更高级别的系统研究。Torpedinidae 科仅具有外皮瓣、钙化不良的扣骨骨架和背侧边缘软骨，其远端部分具有内侧凸缘。在据报道的非单系家族 Narcinidae 和 Narcinidae 的 clasper 中没有发现派生或诊断特征；然而，narcinids 和narcinids 的物种和属的claspers 呈现不同的解剖模式，可用于分类学和系统发育研究。

更新日期：2021-01-09

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