Phylogenetic position of genera Acrostilicus Hubbard and Pachystilicus Casey (Staphylinidae, Paederinae) and their redescription

Acrostilicus Hubbard, 1896 and Pachystilicus Casey, 1905 are North American genera known from only one two species, respectively, have never been a subject of modern revision. In fact, was not even properly described as its author provided sketchy diagnosis the genus species. Here, we provide redescription species illustrate habitus male genital features. For first time, also redescribe their differential diagnoses. Additionally, tested phylogenetic position both genera. They were scored into morphological matrix supplemented with molecular data analyses run using Bayesian inference maximum likelihood methods. A total 119 characters 4859 bp nuclear (28S, TP, Wg, CADA, CADC, ArgK) mitochondrial (COI) sequences analysed for 46 taxa. The results confirmed that members subtribe Stilicina, but at same time challenged monophyly in current composition. further evidence non-monophyly Medonina discussed biology Pachystilicus.