Literatura: Rössner E., Schönfeld J., Ahrens D. 2010. Onthophagus (Palaeonthophagus) medius (Kugelann, 1792) - a good western palaearctic species in the Onthophagus vacca complex (Coleoptera: Scarabaeidae: Scarabaeinae: Onthophagini). Zootaxa, 2629: 1-28.