Aegidium

Revision of the mainland species of the Neotropical genus Aegidium Westwood

 

Frolov A. V., Akhmetova L. A., Vaz-de-Mello F. Z. 2017. Revision of the mainland species of the Neotropical genus Aegidium Westwood (Coleoptera: Scarabaeidae: Orphninae). Journal of Natural History. 51 (19–20): 1035–1090.

The Orphninae genus Aegidium Westwood is revised from mainland South and Central America. Ten new species are described: Aegidium angustum sp. nov., Aegidium bordoni sp. nov., Aegidium gilli sp. nov., Aegidium howdeni sp. nov., Aegidium onorei sp. nov., Aegidium peresfilhoi sp. nov., Aegidium peruanum sp. nov., Aegidium rafaeli sp. nov., Aegidium sinuatum sp. nov. and Aegidium varians sp. nov. The lectotype of Aegidium columbianum Westwood is designated. Keys, descriptions, illustrations of habitus and male genitalia, and distributional record maps are given for all species.

Revision of the genus Aegidium Westwood, 1845, of the Lesser Antilles

 

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

Revision of the genus Aegidium Westwood, 1845, of the Lesser Antilles (Coleoptera: Scarabaeidae, Orphninae, Aegidiini). Aegidium parvulum Westwood, 1846, from Guadeloupe, A. vincentiae Arrow, 1903, from St Vincent and A. dominicense (Cartwright & Chalumeau, 1977) from Dominica are redescribed. A. chalumeaui n. sp. from Guadeloupe and A. dierkensi n. sp. from Martinique are described. The five species are illustrated. Two identification keys are provided, one for the neotropical genera and one for the Aegidium species of the Lesser Antilles.

A new species of Aegidium Arrow from the Atlantic forest ecoregion

Aegidium atlanticum, holotype

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.

The New World genus Aegidium Arrow comprises mid-sized to rather large beetles belonging to 12 species. The genus is distributed up to southern Mexico in the north (Morón 1991) and A. cribratum chileanum Paulian was described from Chile, but Aegidium has not been recorded southeast of the Amazonia. An interesting discovery was made by one of us (P.C.G.) who collected one male Aegidium specimen in the Atlantic forest patch near Nova Friburgo (Rio de Janeiro State, Brazil) — the area separated from the yet known range of the genus by vast territories occupied by the Cerrado biome. Examination of this specimen showed that it belongs to an undescribed species and differs sharply from the other congeners in the shape of its aedeagus.

Genus Aegidium (Scarabaeidae, Orphninae)

Orphninae, Aegidium columbianum

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...

Diagnosis, classification, and phylogenetic relationships of the orphnine scarab beetles

Fig. 1. Orphnus spp. and Allidiostoma spp.

Frolov, A.V. 2012. Diagnosis, classification, and phylogenetic relationships of the orphnine scarab beetles (Coleoptera, Scarabaeidae: Orphninae). Entomological Review, 92, 782-797. PDF (1.07 MB)

Abstract — Orphnine scarab beetles (Orphninae) are widely distributed in tropical and subtropical regions of southern continents except for Australia. Catalogue of nominal taxa of orphnines includes 2 tribes, 15 genera, and 193 species. Diagnosis of the group, based on adult morphological characters, is as follows: antennae 10-segmented with 3-segmented club; mandibles with 2-4 scissorial teeth and well developed mola; labrum and mandibles protruding past clypeus and can be seen from above; scutellum well developed in winged species, reduced but distinct in wingless species; wings with distinct anal area; apices of anterior tibia in males without spur but normally with a few robust setae; anterior coxa with longitudinal hollow on anterior surface; tarsi with 2 similar claws; middle and hind tibiae with 2 apical spurs; 2 abdominal sternite with sub-triangular to rounded plectrum; dorsal surface of hind coxae with oval flat stridulatory file; pygidium partly hidden under elytra; parameres symmetrical; ...