Ferreira José D, Zamorano Martín, Ribeiro Ana Maria
Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil.
Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata, Argentina.
An Acad Bras Cienc. 2015 Mar;87(1):15-27. doi: 10.1590/0001-3765201520140012.
The genus Panochthus represents the last lineage of "Panochthini" recorded in the Pleistocene. This genus has a wide latitudinal distribution in South America, and in Brazil it occurs in the southern and northeastern regions. In this paper we describe new material (isolated osteoderms and caudal tube fragments) assigned to Panochthus from the state of Rio Grande do Sul (southern Brazil) and discuss some taxonomic issues related to Panochthus tuberculatus and Panochthus greslebini based on this material . The occurrence of P. greslebini is the first for outside the Brazilian Intertropical Region. In addition, we describe new diagnostic features to differentiate the osteoderms of P. greslebini and P. tuberculatus. Unfortunately, it was not possible to identify some osteoderms at the species level. Interestingly, they showed four distinct morphotypes characterized by their external morphology, and thus were attributed to Panochthus sp. Lastly, we conclude that in addition to P.tuberculatus registered to southern Brazil, there is another species of the genus, assignable to P. cf. P. greslebini. Our analysis reinforce the reliability of caudal tube characters for the classification of species of Panochthus.
潘诺赫斯属代表了更新世记录的“潘诺赫斯族”的最后一个谱系。该属在南美洲具有广泛的纬度分布，在巴西，它出现在南部和东北部地区。在本文中，我们描述了来自巴西南部南里奥格兰德州的归属于潘诺赫斯属的新材料（孤立的骨板和尾管碎片），并基于这些材料讨论了一些与结节潘诺赫斯和格雷氏潘诺赫斯相关的分类学问题。格雷氏潘诺赫斯在巴西热带地区以外的出现尚属首次。此外，我们描述了新的鉴别特征以区分格雷氏潘诺赫斯和结节潘诺赫斯的骨板。遗憾的是，无法在物种水平上鉴定出一些骨板。有趣的是，它们呈现出四种不同的形态类型，其特征在于外部形态，因此被归为潘诺赫斯属未定种。最后，我们得出结论，除了在巴西南部记录到的结节潘诺赫斯外，该属还有另一个物种，可以归为疑似格雷氏潘诺赫斯。我们的分析增强了尾管特征在潘诺赫斯属物种分类中的可靠性。
