de Moreira Renan A, Loboda Thiago S, de Carvalho Marcelo R
Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, Trav. 14, no. 101, São Paulo, SP, 05508-090, Brazil.
Department of Ichthyology, Division of the Vertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, New York, 10024.
J Morphol. 2018 May;279(5):598-608. doi: 10.1002/jmor.20795. Epub 2018 Jan 31.
Claspers of stingrays (Myliobatiformes) are poorly documented in comparison to claspers of skates, with our knowledge restricted mainly to external morphological characters and skeletal components included in descriptions of new species; more encompassing morphological comparative analyses are lacking. Concerning potamotrygonins, clasper morphology has been described for a handful of species, but without elucidating their variation and systematic potential. The present article analyzed clasper structures in all genera of the subfamily Potamotrygoninae (Potamotrygon, Paratrygon, Plesiotrygon, and Heliotrygon), which were compared to the clasper of Styracura and some dasyatid genera. Potamotrygon shows some morphometric variation among the species analyzed. Anatomically, we found variation mainly in the dorsal terminal 1 and accessory terminal 1 cartilages, which are considered diagnostic among potamotrygonin genera; external morphological structures did not present significant differences among potamotrygonins.
与鳐鱼的交合突相比，魟鱼（鲼形目）的交合突记录较少，我们的了解主要局限于新物种描述中所包含的外部形态特征和骨骼组成部分；缺乏更全面的形态学比较分析。关于江魟属鱼类，已对少数物种的交合突形态进行了描述，但未阐明其变异情况和系统发育潜力。本文分析了江魟亚科（江魟属、副江魟属、近江魟属和太阳魟属）所有属的交合突结构，并将其与坚皮魟属和一些燕魟属的交合突进行了比较。在分析的江魟属物种中，江魟表现出一些形态测量上的变异。在解剖学上，我们发现主要在背侧末端软骨1和副末端软骨1存在变异，这些被认为是江魟属各属之间的诊断特征；江魟属鱼类的外部形态结构没有显著差异。
