Deltorhinum Harold, 1867

Génier, François, 2010, A review of the Neotropical dung beetle genera Deltorhinum Harold, 1869, and Lobidion gen. nov. (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 2693, pp. 35-48 : 36

Deltorhinum Harold, 1867

Harold 1867: 96 [original description]

Harold 1869: 1003 [catalogue]

Gillet 1911: 54 [catalogue]

Luederwaldt 1931: 366 [identification key to genus] Paulian 1938: 234 [identification key to genus] Blackwelder 1944: 205 [checklist]

Vulcano & Pereira 1967: 533–603 [identification key to genus] Vaz-de-Mello 2000: 192 [checklist]

Medina et al. 2001: 134 [checklist]

Vaz-de-Mello 2008: 12 [systematic position] Almeida & Mise 2009: 237 [mention]

Redescription. Small to moderate in size (6.5–14.0 mm). Body oval to elongate-oval. Color light brown in teneral specimens to black, with distinct metallic sheen only in D. robustum . Clypeus regularly tapering toward apex, which is moderately to strongly upturned; apex at most broadly emarginate, never with two distinct teeth. Clypeofrontal suture always distinctly carinate. Pronotal anterior portion modified, produced into a single broad or two narrow lobate projections and additional modifications; simple only in D. robustum , which has a somewhat triangular impression on each side of midline. Pronotal disc with a deep and well defined longitudinal sulcus along most of midline. Elytra strongly convex, with 7 striae on disc, stria 8 distinct from stria 9 only at apex. Elytral pseudepiplera concealed in dorsal view. Pygidium narrowly sulcate basally, sulcus broadly arcuate or slightly bisinuous in distal view. Protibia obliquely truncate anteriorly; protarsi atrophied and usually broken off in non teneral individuals. Mesotibiae and metatibiae very wide at apex in ventral view; tarsi reduced in length, first tarsomere at most 1.5 X longer than wide at apex, usually as wide at apex as long. Sternite 8 unmodified medially. Aedeagus unmodified, parameres simply tapering toward apex, lacking denticles, hooks or rough surface. Internal sac with variously shaped sclerites, usually with a large apical sclerite seemingly forming a guide for the flagellum.