Scymnus (Orthoscymnus) duomaculatus Chen & Ren

Chen, Xiaosheng, Canepari, Claudio, Wang, Xingmin & Ren, Shunxiang, 2016, Revision of the subgenus Orthoscymnus Canepari of Scymnus Kugelann (Coleoptera, Coccinellidae), with descriptions of four new species, ZooKeys 552, pp. 91-107 : 103-104

Taxon classification Animalia Coleoptera Coccinellidae

Scymnus (Orthoscymnus) duomaculatus Chen & Ren sp. n. Figs 7 a–h, 9

Diagnosis.

This species closely resembles Scymnus (Orthoscymnus) robustibasalis in having black pronotum but can be distinguished from it by the black elytra with two brown spots (Fig. 7a) and parameres expanding toward their rounded apices, slightly longer than penis guide in lateral view (Fig. 7h). It is also similar to Scymnus (Pullus) rufomaculatus Canepari, 2012 in dorsal colour pattern, but can be separated from it by the stout penis guide in lateral view (Fig. 7h) and the different shape of penis capsule (Fig. 7e).

Description.

TL: 1.62-1.83 mm, TW: 1.12-1.24 mm, TH: 0.71-0.81 mm, TL/TW: 1.44-1.47, PL/PW: 0.51-0.53, EL/EW: 1.24-1.25, HW/PW: 0.57-0.60, PW/EW: 0.71-0.74.

Body oval, moderately convex, dorsum covered with white pubescence (Fig. 7 a–c). Head black. Antennae and mouthparts dark brown. Pronotum and scutellum black. Elytra black with two kidney-shaped brown spots near suture. Underside entirely black. Legs dark brown.

Head with fine frontal punctures, as large as eye facets, 0.5-1.0 diameter apart. Eyes densely faceted, interocular distance 0.5 times head width. Pronotal punctures larger than those on frons, 1.0-2.0 diameters apart. Surface of elytra with punctures larger than those on pronotum, separated by 1.0-2.0 diameters. Prosternal process trapezoidal, 2 times as long as its width at base; with lateral carinae extending to anterior margin of prosternum, distinctly convergent anteriorly. Abdominal postcoxal lines extending nearly to posterior margins of abdominal ventrite 1 (Fig. 7d), area enclosed by lines finely punctate, broadly smooth along line. Abdominal ventrite 5 truncate and ventrite 6 strongly emarginated apically in male.

Male genitalia. Penis slender (Fig. 7e); penis capsule sclerotized with small inner arm and large outer arm; apex of penis slightly sinuated with membranous appendage (Fig. 7f). Tegmen stout (Fig. 7 g–h) with penis guide parallel-sided from base to 3/4 length, then tapering gradually to blunt apex in ventral view (Fig. 7g). Parameres curved at base, expanded toward apex, slightly longer than penis guide, sparsely covered with long setae at apices (Fig. 7h).

Female externally similar to male but with abdominal ventrites 5 and 6 rounded apically.

Type material.

Holotype: male, No. SCAU (E) 13197, China: Tibet: Jilong Town, Jilong County, 28°23.00'N, 85°19.60'E, ca 2900 m, 29. X. 2011, Li WJ leg. Paratypes (9): Tibet: 2♀ with same data as holotype. 1♂5♀, Zhangmu Town, Nielamu County, Rikaze, 27°58.47'N, 85°58.15'E, ca 2500 m, 27. IX. 2009, Chen XS leg. 1♂, Zhangmu Port, Rikaze, 27°58.47'N, 85°58.15'E, ca 3000 m, 28. IX. 2009, Chen XS leg. (SCAU).

Distribution.

China (Tibet).

Etymology.

The species name is derived from Latin ( ‘duo-’ = two and ‘maculatus’ = maculate), referring to two brown spots on the elytra.