Tagliaferri & Moretto 2012. Essay on the systematics and phylogeny of the Afrotropical Onthophagus Latreille, 1802, belonging to d'Orbigny's seventh group. Description of a new subgenus and three new species (Coleoptera, Scarabaeoidea, Onthophagini). Catharsius, 6, 8 juillet 2012: 1-31