In this study, we test and corroborate the phylogenetic position of Heterosyphus within Helictopleurus using mitogenomes and nuclear loci. Our recent samplings revealed that males of the former Heterosyphus sicardi Paulian, 1975 (today under Helictopleurus d’Orbigny, 1915) have extraordinary bilateral clypeal horns which are exclusive within the genus. We provide a taxonomic review of the fungicola species group of Helictopleurus and discuss the systematic position of H. sicardi within the group. The male phenotype of H. sicardi is described and photographs of the body and genitalia of the members of the fungicola group are given, as well as a diagnostic key to species of the group. Helictopleurus fungicola peyrierasi is considered to be a distinct species within the genus (H. peyrierasistat. rest.). Helictopleurus pluristriatus d’Orbigny, 1915 syn. nov. is established as a junior synonym of H. fungicola (Fairmaire, 1899).

中文翻译：

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基因组测序揭示了马达加斯加粪甲虫属 Helictopleurus（鞘翅目，金龟子科）中非凡的头角：来自真菌物种组修订的见解

在这项研究中，我们使用有丝分裂基因组和核位点测试并证实 Helictopleurus 中 Heterosyphus 的系统发育位置。我们最近的采样显示，前 Heterosyphus sicardi Paulian，1975（今天在 Helictopleurus d'Orbigny，1915 下）的雄性具有非凡的双侧唇角，这是该属独有的。我们提供了 Helictopleurus 的真菌类群的分类学回顾，并讨论了 H. sicardi 在该群中的系统位置。描述了 H. sicardi 的雄性表型，并给出了真菌群成员的身体和生殖器的照片，以及对该群物种的诊断关键。Helictopleurus fungicola peyrierasi 被认为是该属中的一个独特物种 (H. peyrierasistat.rest.)。Helictopleurus pluristriatus d'Orbigny，1915 年 十一月 被确定为 H. funicola (Fairmaire, 1899) 的初级同义词。