The shrimp genera Ephyrina, Meningodora and Notostomus have an unusual carapace strengthened with carinae and a half-serrated mandible, which may suggest a possible monophyly of this group. Here we test this hypothesis and present the first phylogenetic study of these genera based on 95 morphological characters (all valid species coded) and six molecular markers (71% of valid species sequenced). Representatives of all genera of Oplophoridae (sister to Acanthephyridae) were outgroups, 32 species belonging to all genera and potentially different clades of Acanthephyridae were ingroups. Both morphological and molecular analyses retrieve trees with similar topology. Our results reject the hypothesis of a clade formed by Ephyrina + Meningodora + Notostomus. We show that Ephyrina and Notostomus are monophyletic, both on morphological and on molecular trees, Meningodora gains support only on morphological trees. Evolutionary traits in the Ephyrina and Meningodora + Notostomus clades are different. Synapomorphies are mostly linked to adaptations to forward motion in Ephyrina (oar-like meri and ischia of pereopods, stempost-like rostrum) and to progressive strengthening of the carapace and pleon in Meningodora and Notostomus (net of sharp carinae). Unusual mandibles evolved in the clades independently and represent convergent adaptations to feeding on gelatinous organisms.

中文翻译：

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虾属Ephyrina，Meningodora和Notostomus（Acanthephyridae：Caridea）的系统发育研究

虾属Ephyrina，Meningodora和Notostomus的甲壳具有不寻常的甲壳和半锯齿状下颌骨，这可能暗示了这一类的单亲。在这里，我们测试该假设，并基于95个形态特征（所有有效物种已编码）和六个分子标记（有效物种的71％进行了测序）对这些属进行了首次系统发育研究。plo科的所有属（棘皮科的姐妹）的代表是外群，属于所有属的32种和棘皮科的可能不同的进化枝是一组。形态学和分子分析均检索具有相似拓扑的树。我们的结果拒绝了由Ephyrina +组成的进化枝的假设脑膜炎+ Notostomus。我们表明，Ephyrina和Notostomus在形态和分子树上都是单系的，Meningodora仅在形态树上获得支持。在进化特征Ephyrina和Meningodora + Notostomus进化支不同。突触主要与适应在Ephyrina中的前进运动（象脚骨的桨状梅里和坐骨，茎状的讲台）以及在Meningodora和Notostomus中逐渐增强甲壳和骨的适应有关。（尖锐网状网）。下颌骨在进化枝中独立进化，代表着对以胶状生物为食的融合适应。