Open Access

Matthew J. Paulsen

• The Neotropical members of the genus Aesalus Fabricius (Coleoptera: Lucanidae: Aesalinae) are transferred to a new genus, Trogellus, due to their morphological dissimilarity and molecular divergence from the Old World species of Aesalus, and the new genus is revised. A neotype is designated for A. trogoides Albers and a lectotype for A. neotropicalis Bates. Aesalus smithi Bates is placed into synonymy with Aesalus trogoides, new synonymy. Two new combinations result from the transfer of species formerly in Aesalus: Trogellus trogoides from Mexico and Trogellus neotropicalis from Guatemala. In addition to the two known species, eight new species are described: T. catrachitus, T. chapinitus, T. hawksi, T. herrmanni, T. maesi, T. narizotus, T. ticiticus, and T. trifinius. This brings the total number of species of Central American aesalines to ten. A phylogeny of Aesalini based on two gene regions of ribosomal DNA is presented. Due to clear morphological differences and large molecular divergence between species groups, two additional new subgenera of Trogellus are proposed: Mayaesalus and Trogoides.