Madecorphnus dentatus Frolov, 2010

Frolov, Andrey V., Montreuil, Olivier & Akhmetova, Lilia A., 2016, Review of the Madagascan Orphninae (Coleoptera: Scarabaeidae) with a revision of the genus Triodontus Westwood, Zootaxa 4207 (1), pp. 1-93 : 35-38

Madecorphnus dentatus Frolov, 2010

( Figs. 17 A–F)

Madecorphnus dentatus Frolov, 2010c: 1105 .

Type material examined. Holotype ( Figs. 17 A–E), male, “ Chaînes Anosyennes, S.O. du Trafonaomby plateau Andohahelo 1770–1950 m, V-1972 / MUSEUM PARIS Madagascar Est mission C.N.R. S. R. C.P. n°225 / Holotypus Madec. dentatus Frolov 2009 ” ( MNHN) .

Paratypes: two specimens, female with the same data as the holotype and male, “ Madagascar Est: N.- O. de Fort-Dauphin, massif de l'Andohahelo, forêt d'Andranomangara, R.N.I. n 11, 1750 m, 20/ 25-I-1974 A. Peyrieras ” ( MNHN) .

Diagnosis. This species can be separated from other Madecorphnus species by the distinct shape of the parameres and internal sac armature.

Description. Male. Body length 6.0 mm. Color reddish brown, head, legs, and apices of elytra somewhat darker.

Right mandible slightly longer than left, without tooth behind of apex. Labrum trapezoidal, length about 1/4–1/ 5 width (in dorsal view).

Frontoclypeus asymmetrical, slightly convex anteriorly, obtuse, with 2 long and a number of smaller setae. Canthus and frontal suture indistinct. Frontoclypeus somewhat depressed in the middle anteriorly, sparsely punctate.

Pronotum 1.8 times wider than long, widest medially. Margins with relatively wide border, lateral margins with 4 long setae. Pronotum evenly convex, punctate (punctures separated by 2–3 puncture diameters).

Elytra convex, with distinct humeral and apical tubercules. Maximum width approximately at basal 1/3. First stria distinct and reaching the apex of elytron, other striae indistinct. Disc of elytra with sparse punctures. Epipleura with long, sparse, brown setae. Base of elytra with border from scutellum to humeral callus. Elytra minutely punctate except for a few relatively large punctures in the middle of each elytron near stria 1.

Protibiae with 3 outer teeth, lateral margin basad of outer teeth not crenulate. Apex with robust, spur-like seta and a few smaller setae basally. Mesothoracic and metathoracic legs similar in shape. Longer tibial spur as long as 2 basal tarsomeres in mesothoracic legs and as long as 3 basal tarsomeres in metathoracic legs.

Aedeagus. Parameres symmetrical, tapering apically in lateral view, with large teeth laterally ( Fig. 17 B). Internal sac of aedeagus with 1 sclerite composed of 2 long slender spinules connected basally and with 3 small spinules ( Fig. 17 D–E).

Female. Except for shorter mandibles, females differ from males in having 2 setae on hind angles of pronotum and in robust protibial spur.

Variation. Male paratype has shorter mandibles similar to those in female.

Distribution and habitat. Madecorphnus dentatus is known from two localities in southeastern Madagascar ( Fig. 17 F).

Figures

FIGURE 17. Madecorphnus dentatus, holotype. Habitus in dorsal view (A), aedeagus in lateral view and parameres in dorsal view (B), labels (C), internal sac of aedeagus (D—photograph, E—schematic representation of armature), distributional records (F).