Abstract. The superfamily Bogidielloidea is one of the most wide-ranging hypogean amphipod taxa currently known, comprising over 130 species in 43 genera occurring on every continent except Antarctica. This large distribution among such cryptic organisms is curious, especially when combined with weak morphological characters uniting the superfamily. A unique new genus and species of bogidielloid amphipod, Simplexia longicrus, gen. et sp. nov., described from Terrell County, Texas, sheds light on the evolutionary relationships within this grouping. Molecular phylogenetic analyses of the order Amphipoda using two nuclear genes and one mitochondrial gene reveal that this species and the sympatric Parabogidiella americana form a clade removed from other sequenced members of Bogidiellidae sensu stricto, and, as such, the two species are placed in the newly erected Parabogidiellidae, fam. nov. Additional phylogenetic analyses of the cosmopolitan Bogidiellidae are recommended to further resolve its systematics.

中文翻译：

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来自德克萨斯州特雷尔县的一个新的神秘地下片脚类属（片足类：Bogidielloidea），随着 Parabogidiellidae 的建立，fam。11 月，以及关于 Bogidiellidae 科的笔记

摘要。Bogidielloidea 总科是目前已知的最广泛的下层片脚类群之一，包括 43 个属的 130 多个物种，分布在除南极洲以外的每个大陆。这种神秘生物之间的这种大分布是奇怪的，尤其是当与联合总科的弱形态特征相结合时。bogidielloid片脚类的一个独特的新属和种， Simplexia longicrus，gen。等 sp. 11 月，得克萨斯州特雷尔县描述，阐明了该分组内的进化关系。使用两个核基因和一个线粒体基因对端足目进行的分子系统发育分析表明，该物种和同域的 Parabogidiella americana 形成了一个进化枝，该进化枝从严格的 Bogidiellidae sensu stricto 的其他已测序成员中分离出来，因此，这两个物种被放置在新建立的 Parabogidiellidae，fam 中。十一月 建议对世界性 Bogidiellidae 进行额外的系统发育分析，以进一步解决其系统学问题。