Scymnus (Orthoscymnus) robustibasalis (Yu, 2000) Yu, 2000

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 : 100-103

Taxon classification Animalia Coleoptera Coccinellidae

Scymnus (Orthoscymnus) robustibasalis (Yu, 2000) comb. n. Figs 6 a–h, 9

Scymnus (Pullus) robustibasalis Yu in Yu et al. 2000: 180; Pang et al. 2004: 80; Kovář 2007: 587.

Diagnosis.

This species is most similar to Scymnus (Orthoscymnus) duomaculatus sp. n. in having black pronotum but can be easily separated from it by the black elytra (Fig. 6a) and parameres tapering toward apex, distinctly shorter than penis guide in lateral view (Fig. 6h).

Description.

TL: 1.69-1.76mm, TW: 1.10-1.21mm, TH: 0.76-0.83mm, TL/TW: 1.45-1.54, PL/PW: 0.47-0.52, EL/EW: 1.24-1.26, HW/PW: 0.56-0.57, PW/EW: 0.73-0.75.

Body elongate oval, moderately convex, dorsum covered with white pubescence (Figs 6 a–c). Head, antennae and mouthparts dark brown. Pronotum black with anterior angles dark brown. Scutellum black. Elytra black with apical margin narrowly reddish brown. Prothoracic hypomeron dark brown. Prosternum, mesoventrite, metaventrite and elytral epipleura black. Legs yellowish brown.

Head with dense frontal punctures, slightly smaller than eye facets, 0.5-1.0 diameter apart. Eyes densely faceted, interocular distance 0.50 times head width. Pronotal punctures as large as those on frons, 1.0-1.5 diameters apart. Surface of elytra with punctures much 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, slightly convergent anteriorly. Abdominal postcoxal lines reaching 3/4 length of abdominal ventrite 1 (Fig. 6d), area enclosed by lines finely punctate, broadly smooth along line. Abdominal ventrites 5 and 6 in male strongly emarginate apically.

Male genitalia. Penis robust and short, unevenly curved (Fig. 6e); penis capsule sclerotized with both arms well developed; apex of penis simple (Fig. 6f). Tegmen stout with tegminal strut black, highly sclerotized (Fig. 6 g–h). Penis guide slightly constricted at base, parallel-sided at middle part, then tapering gradually to blunt apex in ventral view (Fig. 6g). Parameres stout, tapering toward apex, distinctly shorter than penis guide, densely covered with long setae at apices and inner sides (Fig. 6h).

Female unknown.

Type material.

Holotype: male, "Wenfeng Temple, Lijiang, Yunnan, (26°48.64'N, 100°12.15'E), 20. IV. 1997, Yao DF et al. leg (handwritten) / Scymnus (Pullus) robustibasalis Yu, sp. n. (printed, red label)" (BAAF). Paratype: 1♂, "Wenfeng Temple, Wenbishan, Lijiang, Yunnan, (26°48.64'N, 100°12.15'E), 20. IV. 1997, Yao DF et al. leg (handwritten) / 970512-2 (handwritten) / Paratype (printed, yellow label), Scymnus (Pullus) robustibasalis Yu, sp. n. (printed)" (BAAF).

Other material examined.

Sichuan: 1♂, Laba River National Nature Reserve, Tianquan, 30°0.58'N, 102°27.59'E, ca 1100 m, 4. X. 2007, Chen XS leg. Yunnan: 1♂, Hutiaoxia, Lijiang, 27°10.97'N, 100°3.16'E, ca 1100 m, 3. IX. 2005, Qin ZQ leg.

Distribution.

China (Sichuan, Yunnan).