Onthophagus (Onthophagiellus) sumatramontanus
Notes on the coprophagous scarab-beetles (Coleoptera, Scarabaeidae) from Southeast Asia (XVI) three new species of Onthophagus (Onthophagiellus) from Sumatra and the Malay Peninsula. Entomological Review of Japan, 62(2), Jan 30 2008: 223-232. 226 [Zoological Record Volume 144]