Taxonomic review of the subgenus Hybomidium Shipp 1897 (Coleoptera: Scarabaeidae: Scarabaeinae: Deltochilum)

Summary

The subgenus Hybomidium includes 13 species and one subspecies, of which four are new: Deltochilum (Hybomidium) bezdeki n. sp., D. (H.) carrilloi n. sp., D. (H.) molanoi n. sp., and D. (H.) louzadai n. sp. D. sublaeve Bates 1887 new status and D. panamensis Howden 1966 n. status are elevated from subspecies to species. The synonymies between D. icarus (Olivier 1789) and D. guildingii (Westwood 1835), and between D. orbignyi (Blanchard 1846) and D. chalcea (Buquet 1844) are invalidated, and the synonymy between D. guildingii and D. chalcea new synonymy is proposed; D. amazonicum Bates 1887 is proposed as subspecies of D. orbignyi (D. orbignyi amazonicum n. status). Lectotypes for D. amazonicum, D. chalcea and D. icarus are designated. Descriptions or (re)descriptions, diagnoses, remarks, figures of external morphology and male genitalia, examined material and distribution maps are presented for all species. A key to the species of the subgenus is presented in two languages (English and Spanish).

Résumé

Révision taxonomique du sous-genre Hybomidium Shipp 1897 (Coleoptera : Scarabaeidae : Scarabaeinae : Deltochilum). Le sous-genre Hybomidium Shipp 1897 comprend 13 espèces et une sous-espèce. Quatre sont nouvelles : Deltochilum (Hybomidium) bezdeki n. sp. D. (H.) carrilloi n. sp., D. (H.) molanoi n. sp., and D. (H.) louzadai n. sp. D. sublaeve Bates 1887, n. status, et D. panamensis Howden 1966, n. status, sont élevées au rang d’espèce. Les synonymies entre D. icarus (Olivier 1789) et D. guildingii (Westwood 1835), et entre D. orbignyi (Blanchard 1846) et D. chalcea (Buquet 1844) sont invalidées, et la synonymie entre D. guildingii et D. chalcea n. syn. est proposée. D. orbignyi amazonicum Bates 1887, n. status, est proposé. Les lectotypes de D. amazonicum, de D. chalcea et de D. icarus sont désignés. Les descriptions ou redescriptions, diagnoses, remarques, figures de morphologie externe et des génitalia mâles, le matériel examiné et une carte de répartition sont présentés pour toutes les espèces. Une clé des espèces du sous-genre est présentée en anglais et en espagnol.

Keywords:

• dung beetles
• Deltochilini
• new species
• Neotropics

Acknowledgments

To the Curators and Directors of the visited collections, especially to François Génier, for sending the specimens from the CNM Collection to Brazil. To Fredy Molano, for the male genitalia illustrations of all the species. To Natalia Pansonato, Viviana Caro, Paola Castañena and Tim Baker for the review of the first draft of the English document. To Andrey Frolov for careful proofreading. Thanks to the two anonymous reviewers who helped improve the manuscript. To Claudia Medina and Fredy Molano for their unconditional support. To Mateus Souza, Rafael Nunes, Ricardo Vicente, Miqueias Ferrao, Fernando Silva, and especially to Natalia Pansonato for their hospitality and support with the first author. This study is part of the master thesis of the first author, who is grateful to the Research Group “Biodiversidad y Conservacion” Universidad Nacional de Colombia, especially to Jesus Orlando Rangel. This work was partially supported by FAPEMAT [447441/2009 and 283731/2010], FAPEMIG-Biotaminas [CRA-APQ 03554-0]. FZVM is a CNPq PQ2 fellow, temporarily housed at MNHN thanks to a CNPq PDE grant to PPBIO, and was partially supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico [CNPq 476484/2008-1, 304925/2010-1, 484035/2013-4, 302997/2013-0, 405697/2013-9].