Phylogenomic analyses reveal a rare new genus of wasp (Hymenoptera, Ichneumonidae, Cryptinae) from the Brazilian Atlantic Forest

Within the ichneumonid wasp tribe Cryptini (Ichneumonidae, Cryptinae), <i>Acrosnemus</i> gen. nov. and its single species <i>A</i>. <i>occultus</i> 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 <i>Melanocryptus</i> 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