Contribution to the knowledge of Aegidinus Arrow


Frolov A. V., Akhmetova L. A., Vaz-de-Mello F. Z. 2019. Contribution to the knowledge of Aegidinus Arrow (Coleoptera: Scarabaeidae: Orphninae): new species and comments on the classification and nomenclature. Journal of Natural History. 53 (11-12): 725-747.

Two new species of the Neotropical Orphninae genus Aegidinus Arrow are described: Aegidinus noriegai sp. nov. and Aegidinus colbyae sp. nov. The lectotype of Orphnus candezei Preudhomme de Borre, 1886, is designated. Aegidium steinheili Harold, 1880, considered a synonym of Aegidinus guianensis (Westwood, 1846) is revalidated as Aegidinus steinheili (Harold). The following new synonymies are established: Aegidinus oreibates Colby, 2009 = Aegidinus guianensis (Westwood, 1846), syn. nov.; Aegidinus crypticus Colby, 2009 = Aegidinus guianensis (Westwood, 1846), syn. nov.; Aegidinus sunidigea Colby, 2009 = Aegidinus candezei (Preudhomme de Borre, 1886), syn. nov.; Aegidinus unicus Colby, 2009 = Aegidinus cornutus Colby, 2009, syn. nov. The male of Aegidinus simulatus Colby, 2009, is described. An updated diagnostic key to the males of Aegidinus is provided. The taxonomic and diagnostic characters as well as phylogenetic relationships of Aegidinus are discussed.

Genus Aegidinus (Scarabaeidae, Orphninae)

Orphninae, Aegidinus brasiliensis

Body small to mid-sized (length 6 mm to 12 mm), reddish brown to dark-brown. Mandibles subsymmetrical. Clypeus with tubercle or horns on anterior margin medially in males, without horn in females. Pronotum variably excavated medially in males, convex to depressed medially in females; anterior margin of pronotum in males with a tubercle or horn medially. Propleurae with carinae separating anterolateral areas from basal area. Scutellum narrowly rounded apically, about 1/15 length of elytra. Elytra convex, with marked humeral umbones, with striae marked with elongated punctures. Wings fully developed. Metepisternon triangular, its posterior angle is rounded to triangular and is situated in the distinct concavity of epipleuron. Anterior tibiae with 3 strong outer teeth in both sexes and with a smaller medial tooth in majority of males. Phallobase tube-shaped with strongly sclerotized ventral side but without differentiation of ventral and dorsal sclerites. Parameres relatively short, with complex shape, asymmetrical in one species, apices without setae...