Orphninae, Aegidium columbianum

Genus Aegidium Westwood, 1845

 

Type species: Aegidium colombianum Westwood.

 

Body mid-sized (length 10 mm to 20 mm), brown to dark-brown. Mandibles subsymmetrical. Clypeus without tubercles, horns or ridges. Pronotum with deep excavation in the middle, two horns or ridges bordering the excavation near anterior margin, and with a tubercle medially on the anterior margin in most males; females with pronotum convex, without armature. Propleurae with carinae separating anterolateral areas from basal area. Scutellum narrowly rounded apically, about 1/10 length of elytra. Elytra convex, with marked humeral umbones and 2 low ridges in basal half. Wings fully developed or vestigial. Metepisternon triangular, its posterior angle is rounded to triangular and is situated in the distinct concavity of epipleuron. Middle coxal cavities connected by a hole. Anterior tibiae with 3 strong outer teeth in both sexes and with a smaller medial tooth in majority of males. Phallobase is tube-shaped with strongly sclerotized ventral side but without differentiation of ventral and dorsal sclerites. Parameres relatively long, apices tapering or curved downwards, without setae.

Species composition. 15 species are known.

Distribution. Members of the genus are distributed in northern South America, Central America, Antilles, and the Atlantic Forest region.

References.

Rojkoff S, Frolov AV. 2017. Révision du genre Aegidium Westwood, 1845 des Antilles (Coleoptera, Scarabaeidae, Orphninae, Aegidiini). Annales de la Société Entomologique de France. 52: 354–368.

Frolov, A.V., Grossi, P.C., Vaz-De-Mello, F.Z. 2015. A new species of the genus Aegidium (Coleoptera, Scarabaeidae) from the Atlantic Forest ecoregion in South America. Zootaxa, 4007 (3), 437–439.

Morón, M.-A. (1991) Larva and Pupa of Aegidium-Cribratum Bates (Coleoptera, Scarabaeidae, Orphninae). Coleopterists Bulletin, 45, 360-367.

Paulian, R. (1984) Les Orphnidae Americains (Coleopteres, Scarabaeoidea). Annales de la Société Entomologique de France (N. S.), 20, 65-92.

Preudhomme de Borre, A. (1886) Descriptions de deux espèces nouvelles du genre Aegidium Westwood suivies de la liste des Orphnides du Musée royal d'histoire naturelle de Belgique. Annales de la Société Entomologique de Belgique, 30, 24-26.

Westwood, J. O. (1845) On the lamellicorn beetles which possess exserted mandibles and labrum, and 10-jointed antennae. Transactions of the Entomological Society of London, 4, 155-180.

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02/16/2017 - 00:19