The specimens herein studied were recollected in strata from the Paso Hondo Formation (lower-middle Permian), which are outcropping in the Chicomuselo region, southeast of Chiapas state, limiting with the frontier of Guatemala. The material studied consists of 13 species: four determined to a specific level (Bellerophon deflectus, Discotropis sulcifer, Omphalotrochus cochisensis, and Donaldospira geminocarinata), five conferred to other species (Warthia cf. W. welleri, Warthia cf. W. waageni, Euomphalus cf. E. kaibabensis, Worthenia cf. W. crenulata, and Glabrocingulum cf. G. coronatum), three described to genus level (Glyptospira sp., Naticopsis sp., and Stephanozyga sp.), and one assigned, doubtfully, to the genus Pharkidonotus. This community constitutes the most diverse gastropod fauna from the Permian of Chiapas known to date. Although the material is scarce and poorly preserved, the association allowed relating the age of the bearing rocks to the Kungurian-Roadian (late Cisuralian-early Guadalupian), coinciding with previous data obtained employing other invertebrates and fusulinids. Moreover, the taxa described can be associated with coeval marine faunas from the southern United States (Texas, New Mexico, and Arizona), which are recognized as geographical regions where the Grandian Province's biota was established. This information suggests that, during the early-middle Permian, those territories were connected with Chiapas through epicontinental seas formed in the equatorial region.

本文研究的标本是从帕索洪都组（中二叠纪）地层中采集的，该地层在恰帕斯州东南部的奇科马塞洛地区露头，并以危地马拉的边界为界。研究的材料由13种组成：确定到特定水平的4种（贝氏拟南芥，Discotropis sulcifer，Omphalotrochus cochisensis和Donaldospira geminocarinata），还有5种被赋予其他物种（Warthia cf. W. welleri，Warthia cf. W. waageni，Euomphalus参见E. kaibabensis，Worthenia比照W.红景天和Glabrocingulum比照。G. coronatum），其中三个描述为属水平（Glyptospira sp。，Naticopsis sp。和Stephanozyga sp。），其中一个疑似归为Pharkidonotus属。该社区是迄今为止已知的恰帕斯州二叠纪最多样化的腹足动物区系。尽管该材料稀少且保存不善，但该关联允许将承压岩石的年龄与昆古里亚—罗阿迪亚期（西奥拉尔晚期—瓜达卢普晚期）联系起来，这与先前使用其他无脊椎动物和融合藻类获得的数据相吻合。此外，所描述的分类单元可能与美国南部（得克萨斯州，新墨西哥州和亚利桑那州）的近代海洋动物区系相关联，这些地区被认为是建立格兰迪安省生物群系的地理区域。这些信息表明，在二叠纪中晚期，这些领土通过赤道地区形成的陆上大陆海与恰帕斯州相连。