Within the ichneumonid wasp tribe Cryptini (Ichneumonidae, Cryptinae), Acrosnemus gen. nov. and its single species A. occultus sp. nov. are proposed, described, and illustrated. The phylogenetic placement of the new genus is tested using data from genomic ultraconserved elements in a matrix with 126 other species of Cryptini and five outgroup taxa. Phylogenetic analyses indicate the new genus is related to Melanocryptus Cameron, from which it can be distinguished by the presence of a conspicuous anterolateral tooth on the first metasomal tergite; tip of ventral valve of ovipositor with a dorsal lobe that partly encloses dorsal valve; posterior transverse carina represented only by two distinct sublateral crests; and female antenna with a distinct white band. The new genus presents a mosaic of morphological traits from various cryptine lineages, highlighting the ubiquitous morphological homoplasy among cryptines. The single species is recorded only from one Atlantic Forest fragment in south-eastern Brazil. Sampling history suggests it is naturally rare. http://www.zoobank.org:pub:F2519AD0-9150-4207-9F17-74E72DDC4C6

中文翻译：

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系统基因组学分析揭示了来自巴西大西洋森林的一种罕见的黄蜂新属（膜翅目、蝉科、隐翅目）

在 ichneumonid 黄蜂部落 Cryptini (Ichneumonidae, Cryptinae) 中，Acrosnemus gen. 十一月 及其单一物种 A. occultus sp。十一月 被提出、描述和说明。使用来自 Cryptini 其他 126 个物种和五个外群分类群的矩阵中基因组超保守元素的数据测试新属的系统发育位置。系统发育分析表明这个新属与 Melanocryptus Cameron 有亲缘关系，它可以通过在第一后代体上有一个明显的前外侧牙齿来区分。产卵器的腹瓣尖端，背叶部分包围背瓣；后横向隆突仅由两个不同的次侧嵴代表；和带有明显白色带的母天线。新属呈现出来自各种隐碱谱系的形态特征的马赛克，突出了隐丁中无处不在的形态同质性。该单一物种仅来自巴西东南部的一个大西洋森林片段。采样历史表明它自然是罕见的。http://www.zoobank.org:pub:F2519AD0-9150-4207-9F17-74E72DDC4C6