Universidade Federal do Rio de Janeiro, Departamento de Vertebrados, Setor de Herpetologia, Museu Nacional, Quinta da Boa Vista, s/n, São Cristóvão, 20940-040 Rio de Janeiro, RJ, Brazil.
Universidade Federal do Estado do Rio de Janeiro, Instituto de Biociências, Laboratório de Biossistemática de Anfíbios, Av. Pasteur, s/n, Urca, 22290-240 Rio de Janeiro, RJ, Brazil.
An Acad Bras Cienc. 2024 Oct 7;96(suppl 3):e20240486. doi: 10.1590/0001-3765202420240486. eCollection 2024.
Hemipenes are important structures for the systematics of Squamata, and may assist in the diagnosis of closely related taxa. Only one of the species of Glaucomastix (G. venetacauda) had its hemipenial morphology described in literature so far. Here we analyze and describe for the first time the hemipenes of seven specimens of G. abaetensis and 20 specimens of G. littoralis from the reptile collection of Museu Nacional, Universidade Federal do Rio de Janeiro. In both species the hemipenes are bilobed with a forked sulcus spermaticus in a centripetal orientation and present laminar ornamentations on the hemipenial body and paired awns on the apical region of the lobes. The two species differed from each other only in the modal number of proximal laminae. The main differences in hemipenial morphology between Glaucomastix and its sister genus Ameivula are the presence of laminae in the hemipenial body (absent in Ameivula) and the absence of digitiform papillae on the apical lobular region (present in Ameivula). We expect that our data can be used as an additional tool to diagnose species within the genus Glaucomastix/Ameivula.
半阴茎是有鳞目系统发育的重要结构，可能有助于密切相关分类群的诊断。到目前为止，只有 Glaucomastix 属（G. venetacauda）的一个物种的半阴茎形态在文献中有描述。在这里，我们首次分析和描述了来自里约热内卢联邦大学国家博物馆爬行动物收藏的 7 个 G. abaetensis 和 20 个 G. littoralis 标本的半阴茎。在这两个物种中，半阴茎都是双叶的，具有向心的分叉精沟，并且在半阴茎体上具有层状装饰和叶尖区域的成对的芒。这两个物种仅在近端叶的模态数上存在差异。Glaucomastix 和其姐妹属 Ameivula 之间的半阴茎形态的主要区别在于半阴茎体上存在叶片（在 Ameivula 中不存在）和叶尖小叶区域上不存在指状乳头（在 Ameivula 中存在）。我们希望我们的数据可以用作诊断 Glaucomastix/Ameivula 属内物种的附加工具。
