Revalidation and redescription of Deltochilum (Calhyboma) burmeisteri (Coleoptera: Scarabaeidae), with a key to related species

Abstract

Deltochilum burmeisteri Harold, 1867 has been considered as a junior subjective synonym of D. mexicanum Burmeister, 1848 for almost 8 decades. Nevertheless, D. burmeisteri is resurrected herein from previous synonymy based on the revision of the external and genital morphology. The lectotype for D. burmeisteri, a female specimen, is designated herein. High-quality images are provided to ease the identification of both D. mexicanum and D. burmeisteri. The key to determine closely related species is updated. Both D. burmeisteri and D. mexicanum are appropriate subrogates to study the effects of the habitat modification and climate change, because they inhabit almost exclusively well-conserved mountain cloud forests, one of the most threatened and fragmented terrestrial ecosystems.