Madagascar

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)...

Genus Madecorphnus (Scarabaeidae, Orphninae)

Orphninae, Madecorphnus falcatus

Body small-sized (4.5–5.0 mm) with mostly uniform, brown to black coloration. Upper side of body with a few setae having distinct locations: 1 seta on elytral base near epipleuron, 1 seta on posterior angle of pronotum, 1 seta approximately in the middle of lateral margin of pronotum, 2 setae on the anterior angle of pronotum, 2 setae on each gena, and 2 setae on the anterior margin of clypeus. Mandibles asymmetrical, subequal in length in females and subequal to strongly unequal in males. Clypeus symmetrical to asymmetrical in males, wide, bordered anteriorly, smooth, without tubercles or ridges. Pronotum wider than long, smooth, similar in both sexes, without any depressions, tubercles, or ridges. Propleurae smoothly convex, without carinae separating anterolateral areas from basal area. Scutellum triangular, narrowly rounded apically, about 1/10 length of elytra...

Genus Renorphnus (Scarabaeidae, Orphninae)

Orphninae, Renorphnus clementi (Petrovitz, 1971)

Body small sized (length 7.0 to 9.5 mm), with uniform brown coloration. Mandibles subsymmetrical. Clypeus of both sexes similar, not tuberculate, with more or less raised anterior margin in the middle. Pronotum wider than long, smooth, similar in both sexes, with shallow, sometimes almost indistinct depression anteriorly and 2 small tubercles aside the depression. Propleurae smoothly convex, without carinae separating anterolateral areas from basal area. Scutellum triangular, narrowly rounded apically, about 1/12 length of elytra. Elytra convex, with humeral umbones, with only first stria distinct. Wings fully developed. Metepisternon triangular, tapering caudally, with slightly widened anterodorsal angle slightly overlapping epypleuron. ...

Genus Pseudorphnus (Scarabaeidae, Orphninae)

Orphninae, Pseudorphnus hiboni

Body small to mid-sized (length 6.5 mm to 13 mm), brown to dark-brown. Mandibles subsymmetrical. Clypeus with rounded anterior margin, with tubercle or longitudinal ridge in males; females have clypeus without tubercles or ridges. Pronotum with deep excavation in the middle and with two horns or ridges bordering excavation near anterior margin in males; females with pronotum convex or slightly impressed anteromedially. Propleurae smoothly convex, without carinae separating anterolateral areas from basal area. Scutellum triangular, narrowly rounded apically, about 1/10 length of elytra. Elytra convex, with feebly marked humeral umbones. Sculpture of elytron varies. Wings fully developed. Metepisternon triangular, tapering caudally, with slightly widened anterodorsal angle slightly overlapping epypleuron. Anterior tibiae with 2 strong outer teeth and a small one located basally. Phallobase strongly sclerotized dorsally and with a thin membrane ventrally. Parameres relatively long, apices tapering or curved downwards, without setae. Internal sac of aedeagus with species specific armature.

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.

Three new species of Madecorphnus

Madecorphnus hanskii

Frolov, A.V. 2012. Three new species of scarab beetle genus Madecorphnus Paulian, 1992 (Coleoptera: Scarabaeidae: Orphninae) from Madagascar. Proceedings of the Zoological Institute RAS, 316, 159–165.  PDF (439.31 KB)

Abstract — Three new species of the scarab beetle genus Madecorphnus Paulian, 1992, endemic to Madagascar, are described and their characters are illustrated. The new species are: M. hanskii sp. n. (Ambohitantely special reserve, central plateau), M. aquilonius sp. n. (Northern Madagascar), and M. barclayi sp. n. (Masoala Peninsula, North-Eastern Madagascar). Distribution maps are presented.

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.

Pages