Moreira Renan A, Gomes Ulisses L, 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.
Departamento de Zoologia, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, Rio de Janeiro, RJ, 22559-900, Brazil.
J Morphol. 2017 Sep;278(9):1185-1196. doi: 10.1002/jmor.20703. Epub 2017 May 17.
Claspers of adult specimens of the skate tribe Riorajini, family Arhynchobatidae, comprising Atlantoraja and Rioraja, are described, compared, and systematically reinterpreted based on material collected off southeastern and southern Brazil. For the first time the external components and musculature of the clasper of members of this tribe are described and related to internal (skeletal) structures. The component pecten is present in all species of Atlantoraja but absent in Rioraja. The new external component grip, an autapomorphy of A. cyclophora fully developed in adults, is described. Rioraja presents dorsal terminals 1 and 2, ventral marginal distally extended and ventral terminal cartilages. Dorsal terminals 1 and 2, ventral marginal distally extended, accessory terminals 2 and 3, and ventral terminal cartilages occur in Atlantoraja. A new interpretation of the ventral marginal distally extended is discussed. The dorsal terminal 1 of Atlantoraja has an inverted U shape but is triangular in Rioraja. The accessory terminal 2 cartilage is reported for the first time in Atlantoraja cyclophora. The accessory terminal 3 is present only in A. platana and A. cyclophora, and absent in Rioraja and A. castelnaui. Many of our findings concerning the clasper skeleton do not agree with previous interpretations. The arrangement, distribution and systematic significance of many of the terminal clasper components are discussed among rajoids.
对属于阿氏鳐科鳐属的成年鳐类标本的交合突进行了描述、比较，并根据在巴西东南部和南部海域采集的样本进行了系统的重新阐释。该鳐属包括大西洋鳐属和鳐属。首次描述了该鳐属成员交合突的外部组成部分和肌肉组织，并将其与内部（骨骼）结构相关联。栉状突在大西洋鳐属的所有物种中均存在，但在鳐属中不存在。描述了新的外部组成部分——握器，这是成年圆眼大西洋鳐特有的自近裔性状。鳐属具有背侧末端1和2、向远端延伸的腹侧边缘以及腹侧末端软骨。大西洋鳐属具有背侧末端1和2、向远端延伸的腹侧边缘、副末端2和3以及腹侧末端软骨。讨论了对向远端延伸的腹侧边缘的新解释。大西洋鳐属的背侧末端1呈倒U形，而鳐属的呈三角形。首次在圆眼大西洋鳐中报道了副末端2软骨。副末端3仅存在于普拉塔大西洋鳐和圆眼大西洋鳐中，在鳐属和卡氏大西洋鳐中不存在。我们关于交合突骨骼的许多发现与之前的解释不一致。在鳐类中讨论了许多交合突末端组成部分的排列、分布及其系统学意义。
