Triodontus

Revision of the South American genus Paraegidium (Coleoptera: Scarabaeidae: Orphninae)

 

Frolov A. V., Akhmetova L. A., Vaz-de-Mello F. Z. 2017. Revision of the South American genus Paraegidium (Coleoptera: Scarabaeidae: Orphninae). Journal of Natural History, 51, 995–1014.

The Neotropical Orphninae genus Paraegidium Vulcano et al. is revised. Five new species are described: Paraegidium monneorum sp. nov., Paraegidium barretoi sp. nov., Paraegidium pokornyi sp. nov., Paraegidium howdeni sp. nov., and Paraegidium oliveirai sp. nov. The genus is subendemic to Brazil, and its species are distributed from Guiana Shield in the north to the Peruvian Yungas in the west and to Serra do Mar escarpments in the southeast. Keys, descriptions, illustrations of habitus and male genitalia, and distributional record map are given.

Review of the Madagascan Orphninae with revision of the genus Triodontus Westwood

 

Frolov A. V., Montreuil O., Akhmetova L. A. 2016. Review of the Madagascan Orphninae (Coleoptera: Scarabaeidae) with revision of the genus Triodontus Westwood. Auckland: Magnolia Press. 2016, 93 p.

The subfamily Orphninae (Coleoptera: Scarabaeidae) is reviewed from Madagascar. A total of four genera and 39 species were found, all being endemic to the island. The following five new species are described: Triodontus ankarafantsikae, Triodontus lemoulti, Triodontus viettei, Triodontus fairmairei, and Triodontus inexpectatus. Lectotypes are designated for Orphnus nitidulus Guérin-Méneville, 1844 and Orphnidius modestus Benderitter, 1914. The following new synonymies are proposed: Orphnus nigrita Brancsik, 1893 is synonym of Triodontus hova (Fairmaire, 1868); Triodontus occidentalis Paulian, 1977 and Orphnus obsoletus Brancsik, 1893 are synonyms of Triodontus nitidulus (Guérin-Méneville, 1844); Triodontus vadoni Paulian, 1977 and Triodontus perrotorum Paulian, 1977 are synonyms of Triodontus owas Westwood, 1852.Keys, descriptions, illustrations of habitus and male genitalia, and distributional records maps are given for all species.

Little known Orphninae collected by the Madagascan expeditions

Frolov A.V. 2013. Little known Orphninae (Coleoptera, Scarabaeidae) collected by the Madagascan expeditions of the California Academy of Sciences. Biodiversity Data Journal, 1, e1016.  PDF (462.44 KB) Figure 2. Madecorphnus falcatus Paulian, male, habitus.

New locality records for Madecorphnus niger Frolov, 2010, M. falcatus Paulian, 1992, M. simplex Frolov, 2010, and Triodontus itremoi Paulian, 1977, are given. Endophallus armature of M. niger Frolov, 2010, is described and illustrated.

Genus Triodontus (Scarabaeidae, Orphninae)

Orphninae, Triodontus itremoi

Body small to mid-sized (length 6.5 mm to 17 mm), brown to almost black. Mandibles subsymmetrical. Clypeus with rounded anterior margin, with tubercle or horn in males; females have clypeus without tubercles. Pronotum of larger males of most species with a bulge medially, large excavations aside the bulge, and with two ridge-shaped tubercles laterally of each excavation. Females with convex pronotum without excavations or tubercles. Propleurae smoothly convex, without carinae separating anterolateral areas from basal area. Scutellum rounded apically, about 1/15 length of elytra. Elytra convex, smooth except for base, with marked striae in some species, with feebly marked humeral umbones. Wings fully developed. Metepisternon triangular, tapering caudally, with slightly widened anterodorsal angle slightly overlapping epypleuron. Anterior tibiae of typical scarabaeoids shape, with 3 relatively large outer teeth. Phallobase strongly sclerotized dorsally and with a thin membrane ventrally. Parameres relatively short, complex, consisting of medial and lateral parts, without setae. Internal sac of aedeagus with one characteristic symmetrical sclerite (or group of fused sclerites)...

A new genus of Orphninae from Madagascar

Figs 1-5. Renorphnus clementi. 1, 2 – general view (1 – male, 2 – female); 3 – parameres in dorsal view; 4 – aedeagus in lateral view; 5 – internal sac of aedeagus.

Frolov, A.V., Montreuil, O. 2009. A new genus of Orphninae (Coleoptera, Scarabaeidae) from Madagascar. Zoosystematica Rossica, 18, 65-69. PDF (2.69 MB)

Abstract — A new genus, Renorphnus gen. n, is established for Madagascar species Orphnus clementi Petrovitz. The new genus differs in distinctive shape of anterior tibiae of male, shape of clypeus, pronotum with 2 more or less prominent tubercles in both sexes, and in widened and pectinate setae on costal margin of wings. O. clementi is redescribed. Diagnostic key to Madagascar Orphninae genera is given.

New Species of Triodontus from Southern Madagascar

Figs. 1–4. Triodontus hanskii sp. n.: (1, 2) habitus; (3) abdomen, ventral view; (4) parameres, lateral, dorsal, and ventral view.

A.V. Frolov. 2010. A New Species of the Genus Triodontus (Coleoptera, Scarabaeidae, Orphninae) from Southern Madagascar. Entomological Review, Vol. 90, No. 8, pp. 1031–1034. PDF (476.29 KB)

Abstract — A new scarab beetle species of the endemic Madagascan genus Triodontus Westwood, T. hanskii sp. n., is described from a specimen collected in Southern Madagascar. The new species differs from similar Triodontus species with two medial pronotal tubercles and simple last abdominal sternite in a distinctive shape of the parameres. The type specimen of the new species originates from the southernmost remnant of indigenous rain forest of the island.