Rhinocricus Karsch, 1881 has 207 species occurring mainly in the Americas, and more than 60 of them were described from Brazil. The genus was proposed based on the presence of dorsal scobinae on the prozonites. The present study evaluates the monophyly of three species groups previously proposed in Rhinocricus. We evaluated 39 morphological characters and included 30 species as terminal taxa, 9 of which are outgroups. We performed a parsimony analysis under implied weighting in TNT 1.5, obtaining the same most parsimonious tree topology with three optimal K values (5.992, 7.309, and 9.105). None of the three previously proposed species groups of Rhinocricus was recovered monophyletic. Rhinocricus (Erythocricus) sanguineostriatus Schubart, 1962 was recovered sister to all other species, and Argentocricus Verhoeff, 1941 resulted paraphyletic. The diagnostic morphological characters traditionally used to separate species groups, subgenera, and genera were not recovered as synapomorphies. Further investigation including a broader species sample is needed to establish robust relationship hypotheses between Argentocricus and the remainder species of Rhinocricus, thus identifying monophyletic groups in the genus and their synapomorphies.

中文翻译：

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Rhinocricus Karsch 三个物种群的系统发育，1881 基于形态特征（双足纲、Spirobolida、Rhinocricidae）

Rhinocricus Karsch, 1881 有 207 种，主要分布在美洲，其中 60 多种来自巴西。该属的提出是基于深海带上存在背鳍石斑鱼。本研究评估了先前在 Rhinocricus 中提出的三个物种群的单一性。我们评估了 39 个形态特征，包括 30 个物种作为终端分类群，其中 9 个是外群。我们在 TNT 1.5 中进行了隐含加权下的简约分析，获得了具有三个最佳 K 值（5.992、7.309 和 9.105）的相同最简约的树拓扑。之前提出的三个 Rhinocricus 物种组中没有一个是单系的。Rhinocricus (Erythocricus) sanguineostriatus Schubart, 1962 被发现是所有其他物种的姐妹，Argentocricus Verhoeff, 1941 导致并系群。传统上用于区分种群、亚属和属的诊断形态特征没有恢复为突触。需要包括更广泛的物种样本在内的进一步调查，以在 Argentocricus 和 Rhinocricus 的其余物种之间建立可靠的关系假设，从而确定该属中的单系群及其突触。