Triodontus fairmairei Frolov, Montreuil & Akhmetova

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 : 82-83

Triodontus fairmairei Frolov, Montreuil & Akhmetova , new species

( Figs. 42 A–F)

Type material. Holotype ( Figs. 42 A–F), male, “Madag […] / MUSEUM PARIS MADAGASCAR Collection Leon Fairmaire 1906 / HOLOTYPUS Triodontus fairmairei Frolov et al. 2010 ” ( MNHN) .

Diagnosis. From other Triodontus species, T. fairmairei can be separated by the outer lobes of the parameres without lateral notches, relatively large inner lobes of the parameres, and somewhat Y-shaped sclerite of the internal sac of the aedeagus.

Description. Holotype, male. Body length 8.9 mm. Color of head, pronotum, and elytra blackish brown; legs, antennae, and underside of the body brown ( Figs. 42 A–B).

Frontoclypeus slightly convex anteriorly, obtusely rounded laterally, anterior margin setose in dorsal view. Eyes relatively small (diameter slightly smaller than the distance between eye and gula in ventral view), incompletely divided by canthus into small, dorsal and large, ventral parts. Frontoclypeus with tubercles mediad of each eye and with a horn in the center. The horn is shorter than width of the head, acutely rounded apically, somewhat curved caudally, with slightly flattened anterior side and slightly rugose posterior side.

Pronotum with a bulge medially in center, with excavations aside the bulge, and with 2 ridge-shaped tubercles laterally of each excavation. The median bulge with 2 distinct tubercles and somewhat excavated between the tubercles. Lateral margins with wide border bearing a row of brown setae. Anterior margin with wide, smooth border, almost not sinuate medially. Posterior margin with fine border; not crenulate; punctate with a few narrow, longitudinal punctures. Surface of most pronotum punctate with minute, feebly visible puctures.

Scutellum rounded apically, visible part about 1/14 length of elytra.

Elytra convex, with humeral humps. Maximum width approximately at the middle. Elytral striae indistinct (except for stria 1). Intervals with minute punctures, almost smooth. Base of elytra with an irregular row of coarse punctures.

Sternite 8 medially slightly sinuate, without tubercles or concavities in the middle ( Fig. 42 D).

Parameres ( Fig. 42 F) have outer lobes without lateral notches, inner lobes relatively large. Internal sac of aedeagus with Y-shaped sclerite ( Fig. 42 C).

Female. Unknown.

Distribution. The only known specimen of this species lacks information about the collection locality except for the reference to Madagascar.

Remarks. The holotype lacks left prothoracic leg and left metatibia.

Etymology. The new species is dedicated to the memory of Leon Fairmaire, French entomologist of the 19th century, who described a significant part of the Madagascan Coleoptera fauna.

Figures

FIGURE 42. Triodontus fairmairei, holotype male. Habitus in dorsal (A) and dorsolateral view (B), internal sac of aedeagus (C), abdomen (D), labels of holotype (E), aedeagus in lateral view and parameres in dorsal and ventral view (F).