He, L. and Zhou, H.-Z. 2017. Taxonomy of the genus Protocypus J. Müller, 1923 (Coleoptera: Staphylinidae: Staphylinini) and two new species from China. Zootaxa. 4291, 3 (Jul. 2017), 458–480. DOI:https://doi.org/10.11646/zootaxa.4291.3.2.