Cestradoretus tenuirostris Ohaus, 1912

Frolov, Andrey V. & Montreuil, Olivier, 2019, A review of the Madagascan species of the genus Cestradoretus Ohaus (Coleoptera: Scarabaeidae: Rutelinae: Adoretini), Zootaxa 4638 (2), pp. 296-300 : 297-299

Cestradoretus tenuirostris Ohaus, 1912 ( Figs. 1 A–G, 2I)

Cestradoretus tenuirostris Ohaus, 1912: 417 .

Type material examined. Holotype ♂ ( Fig. 1 A–C): “ Antananarivo Madagascar F.Sikora / Type / Cestradoretus tenuiro- stris Ohs / Syntype Cestradoretus tenuirostris Ohaus, 1912 labelled by MFNB 2018” ( MFNB).

Additional material. 1♂: “ Morondava Foret sud de Befasy I-56, R.P. [R. Paulian]” ( MNHN) ; 5♂ and 4♀: “Pce Tu- lear [Toliara Province] Ambovombe P. Clément ” ( MNHN) ; 1♀: “Muséum Paris Madagascar Ankazoabo J. Bastard 1902” ( MNHN) ; 3♂: “Muséum Paris Madagascar Reg. d’Ankazoabo C. Le Barbier 1920” ( MNHN) .

Differential diagnosis. Cestradoretus tenuirostris differs from C. melolonthoides , new combination in having parameres more fused apically (separated by triangular sinuation, Fig. 1B ), having no spine dorsobasally, and lighter color with elytra having no longitudinal stripes. The sexual dimorphism is weaker than in C. melolonthoides , new combination.

Female differs from male in having shorter antenna, wider elytra, smaller tarsal claw being longer, and longer apical abdominal sternite ( Fig. 1D, F, G ).

Distribution. Central, Western and Southern Madagascar: S.-P. Tananarivo, S.-P. Modondava, S.-P. Ankazoabo, and S.-P. Ambovombe ( Fig. 2I ).

Remarks. The type specimen was labelled by the MFNB staff as a “ syntype ”, but it can be inferred from the original description that Ohaus examined only one specimen that should hence be considered as a holotype.

Figures

FIGURES 1A–G. Cestradoretus tenuirostris Ohaus, 1912. A–C, holotype, male; D–F, female; G, male; A, D, habitus; B, aedeagus in lateral and parameres in dorsal view; C, labels; E, head in ventral view; F, G, abdomen in ventral view. Scale bar = 1.0 mm.

FIGURES 2A–H. Cestradoretus melolonthoides (Fairmaire, 1896), new combination. A, B, holotype, female; C, D, H, male; E–G, female; A, D, F, habitus; B, labels; C, aedeagus in lateral and parameres in dorsal view; E, head in ventral view; G, H, abdomen in ventral view; I, locality map (white circle—C. tenuirostris, black circle—C. melolonthoides). Scale bar = 1.0 mm.