Lobidion punctatissimum, 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 : 46-47

Lobidion punctatissimum sp. nov.

(Figs. 29–31)

Diagnosis. See generic diagnosis.

Description. Holotype female. Body and legs dark brown to black. Clypeus feebly upturned medially; clypeal teeth short and broadly rounded; marginal bead unmodified, well defined throughout. Gena bluntly and obtusely angular laterally. Frontal carina arcuate in dorsal view, median portion noticeably lower than lateral portions. Vertex with fine, sharply defined punctures throughout. Pronotal surface entirely covered with dense, fine, and sharply defined punctures; punctures slightly larger along posterior edge; pronotal median longitudinal sulcus reduced to a shallow weakly defined concavity on basal third; pronotal anterior portion unmodified. Elytral surface irregular, minutely punctate; striae moderately wide and defined, with distinct microsculptures, slightly wider and more deeply impressed on apical declivity, punctures rounded and encroaching on interstriae. Elytral epipleuron explanate, visible in dorsal view, ventral surface with irregular transverse rugulae. Protibia smooth on dorsal surface. Profemur sharply carinate anteriorly. Mesofemora and metafemora with a wide coarsely microsculptured furrow along posterior edge. Mesotarsi and metatarsi with first tarsomere approximately 1.5 X longer than wide at apex. Abdominal segment 8 wide, with an acute dentiform process pointing posteroventrally. Pygidial surface covered with large, shallow and microsculptured punctation; apical marginal bead interrupted internally; pygidial apex truncate.

Measurements (1 specimen) body length: 7.5 mm.

Holotype Ƥ (MZSP): BRAZIL: MATO GROSSO, Mun. Cotriguaçu, Fazenda São Nicolau, mata nordeste, 09°50'25''S, 058°15'9''W, 6.X.2009, coll. F.Z. Vaz-de-Mello, in Acromyrmex aff. subterraneus nest / WOLRD SCARAB. DATABASE, WSD00017748 / Holotype Ƥ, Lobidion punctatissimum sp. nov. F. Génier, 2010.

Material examined (1Ƥ): BRAZIL: MATO GROSSO, Fazenda São Nicolau (mata nordeste), Municipio Cotriguaçu, (9°50'25''S, 58°15'9''W), 6.x.2009, coll. F.Z. Vaz de Mello - 1Ƥ (holotype) ( MZSP).

PLATE 4. Figs. 29–31, Lobidion punctatissimum sp. nov. (holotype, female); Fig. 29, habitus; Fig. 30, head and pronotum; Fig. 31, ventrites and pygidium, ventral view.

Etymology. Punctatissimum , an adjective in apposition relating to the finely and densely punctate head and pronotum of this species.

Natural history. Collected in the refuse pile of a very large nest of Acromyrmex aff. subterraneus (Forel, 1893) in Amazonian forest approximately 100 m from a pasture. This specimen was collected along with specimens of Ontherus sp. belonging to the Ontherus brevipennis group as defined by Génier (1996) (F. Z. Vaz de Mello, Universidade Federal de Mato Grosso, Cuiaba, Brazil; personal communication).