Shibatta Oscar Akio, Filho Hugo Sum DE Souza
Museu de Zoologia; Departamento de Biologia Animal e Vegetal; Centro de Ciências Biológicas; Universidade Estadual de Londrina; 86057-990; Londrina; PR; Brazil..
Zootaxa. 2025 Mar 10;5601(3):429-450. doi: 10.11646/zootaxa.5601.3.2.
Iheringichthys labrosus is a catfish from the Paraná River basin with a peculiar conical snout, small mouth, thin premaxillary dentigerous plate, and broad upper lip folded posteriorly, differing from other genera of the Pimelodidae except for the monotypic Bergiaria. This comprehensive study on cleared and stained specimens and dry skeletons of Iheringichthys labrosus demonstrates many similarities with Pimelodus maculatus, showing a conservative skeleton with differences only in the shape of buccal apparatus bones. Bergiaria westermanni diverges from I. labrosus only by a reduced premaxilla and loss of teeth, suggesting autapomorphies of the species and casting doubt on the validity of the genus. Conorhynchos conirostris also has a conical snout and small mouth but does not share several synapomorphies of the Pimelodus-Callophysus group observed in I. labrosus.
唇须伊氏鲶是一种来自巴拉那河流域的鲶鱼，具有独特的圆锥形吻部、小嘴、薄的前颌齿板和向后折叠的宽阔上唇，除单型的贝氏鲶属外，与油鲶科的其他属不同。这项对唇须伊氏鲶的透明和染色标本以及干燥骨骼的综合研究表明，它与黄斑油鲶有许多相似之处，显示出一种保守的骨骼结构，仅在口腔器官骨骼的形状上存在差异。韦氏贝氏鲶与唇须伊氏鲶的区别仅在于前颌骨缩小和牙齿缺失，这表明该物种具有独特衍征，并对该属的有效性提出了质疑。锥吻锥吻鲶也有一个圆锥形吻部和小嘴，但不具有在唇须伊氏鲶中观察到的油鲶属 - 美鲶属类群的几个共同衍征。
