The delineation of antlion genera has often been based on morphological characters not tested in a phylogenetic context, thus seriously impairing the study of systematics of the family Myrmeleontidae. Nebulous generic limits also impede the taxonomy and study of the affinities of closely related species. As a case study, the generic placement of Megistopus mirabilis Hölzel, 1980, was based on a single leg character. To test the position of this species, the reciprocal relationships of the members of the genera Gymnocnemia Schneider, 1845, and Megistopus Rambur, 1842 were investigated, using a morphology-based phylogenetic analysis. This approach demonstrated that M. mirabilis should actually be assigned to the genus Gymnocnemia, as G. mirabilis comb. n. This analysis also supports the subdivision of the tribe Nemoleontini in two subclades based on morphology of male and female genitalia. A new characterisation of these genera is provided, as well as a redescription of the very rare G. mirabilis and the poorly investigated Megistopus lucasi (Navás, 1912). An updated identification key to the members of the genera Gymnocnemia and Megistopus is presented.

中文翻译：

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Gymnocnemia Schneider 属的分类学和系统发育，1845 年和 Megistopus Rambur，1842 年，以及对 Nemoleontini 部落（神经翅目、Myrmeleontidae）的系统化的评论

蚁狮属的划分通常基于未在系统发育背景下测试的形态特征，从而严重损害了对桃金娘科系统学的研究。模糊的通用限制也阻碍了对密切相关物种的亲缘关系的分类和研究。作为案例研究，Megistopus mirabilis Hölzel, 1980 的一般放置基于单腿特征。为了测试该物种的位置，使用基于形态学的系统发育分析研究了 Gymnocnemia Schneider，1845 和 Megistopus Rambur，1842 属成员的相互关系。这种方法表明 M. mirabilis 实际上应该归入 Gymnocnemia 属，就像 G. mirabilis 梳的那样。n. 该分析还支持根据男性和女性生殖器的形态将 Nemoleontini 部落细分为两个子分支。提供了这些属的新特征，以及对非常稀有的 G. mirabilis 和研究不足的 Megistopus lucasi (Navás, 1912) 的重新描述。提供了 Gymnocnemia 和 Megistopus 属成员的更新识别密钥。