Lobidion, Génier, François, 2010

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 : 44-45

Lobidion gen. nov.

Type species: Lobidion punctatissimum sp. nov. here designated.

Diagnosis. The lobate clypeofrontal carina, strongly convex and finely punctate pronotum combined with the explanate pseudepipleuron will separate this genus from all other closely related Ateuchina genera.

Description (based on female). Closely related to Deltorhinum . Small in size (7.5 mm). Body elongateoval. Color, dark brown to black, lacking distinct metallic sheen. Clypeus regularly tapering toward apex, which is slightly upturned; apex with two blunt teeth. Clypeofrontal suture strongly raised into a flat lobate projection. Pronotal anterior portion unmodified, convex. Pronotal disc with a shallow weakly defined sulcus on posterior third. Elytra strongly and evenly convex, with 7 striae on disc, stria 8 distinct from stria 9 only at apex. Elytral pseudepipleura explanate, visible in dorsal view. Pygidium narrowly and shallowly sulcate basally, sulcus broadly arcuate in distal view. Protibia obliquely truncate anteriorly; protarsi slightly atrophied. Mesotibiae and metatibiae moderately wide apically in ventral view; tarsi longer than apical tarsal edge, first tarsomere unmodified, longer than wide at apex. Sternite 8 modified medially (most likely a secondary sexual character in female). Male genitalia unknown.

Etymology. From the Greek lobos, a rounded projection, and the diminutive idion referring to the cephalic projection in the only known species of this genus (gender neutral).

Remark. Interestingly, the cephalic ornamentation of this genus is nearly identical to the species of the genus Ontherus ( Ontherus brevipennis group), which was collected in the same microhabitat.

PLATE 3. Figs. 18–20, Deltorhinum armatum sp. nov.; Figs. 21–22, D. bilobatum sp. nov.; Figs, 23–25, D. guyanensis sp. nov.; Figs. 26–28, D. vazdemelloi sp. nov.. Figs. 18, 21, 23, 26, parameres, dorsal view; Figs. 19, 22, 24, 27, paramere, lateral view; Figs. 20, 25, 28, internal sac.