Deltorhinum bilobatum, 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 : 39-40

Deltorhinum bilobatum sp. nov.

(Figs. 8–9, 21–22)

Diagnosis. Differs from all other species in the genus by the bilobate pronotal anterior edge combined with the simply convex surface behind anterior depression on each side of midline.

Description. Holotype male: Body and legs black. Clypeus moderately upturned medially; median projection feebly emarginate medially; marginal bead unmodified, weakly defined laterally. Gena bluntly angular laterally. Frontal carina distinctly arcuate in dorsal view, median portion higher than lateral portions. Vertex minutely punctate. Pronotal surface minutely punctate, puncture large and weakly defined on anterior transverse depression and along longitudinal sulcus; median longitudinal sulcus wide and deeply impressed throughout; pronotal anterior edge bilobate medially, lobate portion preceded by a transverse leveled surface, surface gradually rounded behind depression, lacking small depressed area on each side of midline. Pronotal basal surface smooth on most of width along posterior edge, a few weakly defined larger punctures on median fifth. Elytral surface minutely punctate; striae fine and sharply defined, more deeply impressed on apical declivity, punctures transversal and encroaching on interstriae. Elytral epipleuron unmodified, hidden in dorsal view. Protibia with punctures more or less set on a single oblique row on dorsal surface. Profemur sharply carinate anteriorly. Mesofemora and metafemora simply convex ventrally. Mesotarsi and metatarsi with first tarsomere slightly longer than width at apex. Pygidial surface finely punctate throughout; basal sulcus narrowly rugose; apical marginal bead sharply defined internally.

Measurements (3 specimens): body length: 9.0– 9.5 mm.

Holotype 3 (CMNC): [ BRAZIL] Utiariti, Rio Papagaio, Mt, 22–31.X.1966, Lenko & Pereira / COLLECTION François GÉNIER, P.Q., CANADA / WOLRD SCARAB. DATABASE, WSD00008018 / Holotype 3, Deltorhinum bilobatum sp. nov. F. Génier, 2010. Aedeagus extracted.

Material examined (13, 2ƤƤ): BRAZIL: MATO GROSSO, Uirapuru, (14°0'56''S, 59°22'4''W), ii.2003, coll. A. Foucart - 1Ƥ (paratype) ( CEMT); Utiariti, Rio Papagaio, (13°1'51''S, 58°17'3''W), 22–31.x.1966, coll. Lenko & Pereira - 13 (holotype) ( CMNC); MATO GROSSO DO SUL, UNESP Farm [=Fazenda Experimental da Universidade Estadual Paulista, câmpus de Ilha Solteira], Selvíria, (20°22'55.41''S, 51°24'39.3''W), 14.xi.1992, coll. S.R. Rodrigues - 1Ƥ (paratype) ( CEMT).

Etymology. Bilobatum , a Latin adjective in apposition referring to the pronotal bilobate anterior edge.

Natural history. Unknown.

Variation. As for D. armatum , the only variation resides in size and the female having coarser pronotal punctures.

Remark. The holotype was killed in formalin and the internal sac could not be extracted and prepared for illustration. This is the only known male specimen.