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

在鱼鳞龙类黄蜂部落隐孢子虫（Ichneumonidae，Cryptinae），Ac虫属。十一月 其品种单一一个。隐匿菌 十一月 提出，描述和说明。使用来自基因组超保守元件的数据与其他126个Cryptini物种和5个外群类群的基质中的数据，测试了新属的系统发生位置。系统发育分析表明该新属与黑皮病有关Cameron，它的特征是在第一变质辉铁矿上有明显的前齿。产卵器腹瓣尖端，其背叶部分封闭背瓣；后横向隆突仅由两个不同的次侧sub代表；和带有明显白带的女性天线。该新属呈现出各种隐性谱系的形态特征镶嵌，突显了隐性蛋白之间普遍存在的形态同质性。仅在巴西东南部的一个大西洋森林碎片中记录了该单一物种。采样历史表明它自然是罕见的。

http://www.zoobank.org:pub:F2519AD0-9150-4207-9F17-74E72DDC4C6