Temnocephala axenos Monticelli, 1898 was described based on specimens from an unidentified host collected in Blumenau, Santa Catarina, Brazil. Information about type locality was imprecise and the host was later identified as Aegla laevis (Latreille, 1818). However, it is known that A. laevis is not present on the eastern side of the Andes. Also, only histological preparations from one specimen studied by Monticelli are currently available in the Museum für Naturkunde Berlin, but it showed none of the taxonomic characters needed for the characterization of the species. Although the updated description of the species based on Uruguayan specimens, neither the author nor the several previous studies about the species showed a search for the type material, a resolution for the misidentification of the type host or the imprecise type locality due to the subsequent geographical division of the municipality cited in the description. The Uruguayan specimens were not even geographically close to the type locality and a neotype was not designed to validate the species’ taxonomic status again. Specimens from Santa Catarina and Paraná States, Brazil, were studied, as well as restudied Argentinean specimens. The new data were compared with the update description of the species. The historical background and the discussion about geographical origins and hosts of the species, as well as a designation of a neotype, allow comparative material of the type locality and type host to exist, eliminating doubts about the identification of T. axenos.

中文翻译：

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关于 Temnocephala axenos Monticelli，1898 年（Platyhelminthes，Temnocephalida）：分类地位和新类型的指定

天蛉蒙蒂塞利，1898 年是根据在巴西圣卡塔琳娜州布卢梅瑙收集的不明宿主的标本进行描述的。关于类型位置的信息不精确，主机后来被确定为大眼羚（拉特雷耶，1818 年）。然而，据了解，A. laevis安第斯山脉东侧不存在。此外，目前只有蒙蒂塞利研究的一个标本的组织学制剂可在柏林自然博物馆获得，但它没有显示出该物种表征所需的任何分类学特征。尽管根据乌拉圭标本对该物种进行了更新的描述，但无论是作者还是之前对该物种的几项研究都没有表明对模式材料的搜索、对模式宿主错误识别的解决方案或由于随后的地理环境导致的模式位置不精确描述中引用的市政府部门。乌拉圭标本在地理上甚至与模式产地不相近，并且没有设计新模式来再次验证该物种的分类地位。来自圣卡塔琳娜州和巴拉那州的标本，对巴西进行了研究，并重新研究了阿根廷的标本。将新数据与物种的更新描述进行了比较。历史背景和对该物种地理起源和宿主的讨论，以及新类型的指定，使得模式产地和模式宿主的比较材料存在，消除了对物种识别的疑虑。T. axenos.