Madecorphnus montreuili 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 : 26

Madecorphnus montreuili Frolov, 2010

( Figs. 10 A–H)

Madecorphnus montreuili Frolov, 2010c: 1102 .

Type material examined. Holotype ( Figs. 10 A–B, D–F), male, “ MADAGASCAR ANTANAMBE 25 /01/ 90 P. E.C. Foret PROG . MAG188-007 / Holotypus Madec. montreuili Frolov 2009 ” (MNHN).

Additional material examined. Five males and two females with the same data as the holotype ( MNHN).

Diagnosis. This species is similar to M. barclayi Frolov, 2012 and M. tuberculatus Frolov, 2014 in having 2 distinct tubercles on the mentum and bidentate apex of right mandible, but differs from them in having internal sac of aedeagus with 3 conical to spur-shaped sclerites, 2 larger and 1 smaller.

Description. Male. Body length 5.8–6.0 mm. Color uniformly blackish brown.

Right mandible about 1.5 times longer than left, strongly curved, with a tooth behind apex ( Fig. 10 A). Labrum trapezoidal, its length about 1/5 width (in dorsal view).

Frontoclypeus slightly asymmetrical, slightly convex anteriorly, obtuse, with 2 long and a number of smaller setae. Frontoclypeus somewhat depressed in the middle anteriorly, smooth.

Pronotum 1.8 times wider than long, widest medially. Margins with relatively wide border, lateral margins with 4 long setae. Pronotum evenly convex, minutely punctate.

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. Epipleura with long, sparse, brown setae. Base of elytra with border from scutellum to humeral callus. Elytra punctate with sparse 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 shorter than 2 basal tarsomeres in mesothoracic legs and shorter than 3 tarsomeres in metathoracic legs.

Parameres symmetrical, relatively wide in dorsal view, with 2 distinct teeth laterally ( Fig. 10 B). Internal sac with 2 large and 1 smaller sclerites ( Figs. 10 E–F).

Female, The female ( Fig. 10 C) differs from male in having short subsymmetrical mandibles, long protibial spur, and relatively wider elytra.

Distribution and habitat. Madecorphnus montreuili is known from one locality in eastern Madagascar ( Fig. 10 G). This area, south of Antongil Bay, has a few patches of indigenous rain forest inland of Antanambe, where the beetles were collected.

Figures

FIGURE 10. Madecorphnus montreuili. Habitus in dorsal view (A—male, C—female), aedeagus in lateral view and parameres in dorsal view (B), labels of holotype (D), internal sac of aedeagus (E—photograph, F—schematic representation of armature), distributional records (G), protibia (H, male left, female right).