Serangium dulongjiang Wang, Ren & Chen

Wang, Xing-Min, Ren, Shun-Xiang & Chen, Xiao-Sheng, 2011, A review of the genus Serangium Blackburn (Coleoptera, Coccinellidae) from China, ZooKeys 134, pp. 33-63 : 53-54

Serangium dulongjiang Wang, Ren & Chen sp. n. Figs 2380-8595

Diagnosis.

This species is close to Serangium digitiforme in general appearance and male genitalia, but it is distinguished from the latter as follow: penis is long and slender (Fig. 81), penis guide is elongated tongue-shaped (Fig. 83), and the first part of spermatheca has a strong constriction in middle (Fig. 84). In Serangium digitiforme , penis is moderately long and stout, distinctly broadening at apical 1/5-2/5 (Fig. 63), penis guide is finger-shaped (Fig. 65), and the first part of spermatheca has a feebly constriction in middle (Fig. 66).

Description.

TL: 2.01-2.14mm, TW: 1.68-1.81mm, TH: 0.86-0.96mm, TL/TW: 1.18-1.20; PL/PW: 0.44-0.49; EL/EW: 0.96-1.00.

Body minute, hemispherical, dorsum strongly convex, shiny and glabrous (Fig. 23). Dorsum uniformly black. Head orange to dark brown. Underside black. Legs yellowish brown to dark red, except tarsi yellow.

Head transverse and ventrally flattened, 0.41 × elytral width (HW/EW=1: 2.43); punctures on frons fine, separated by 1.5-2.5 times their diameter, with sparse setae; eyes moderately large and coarsely faceted, widest interocular distance 0.52 × head width. Antenna 9-segmented, terminal segment large, elongate oval and flat, apex angular.

Pronotum short and strongly transverse, 0.71 × elytral width (PW/EW=1: 1.42), densely covered in fine punctures associated with long dense setae, punctures similar to those on head, separated by 0.5-1.0 times their diameter. Punctures on elytra fine and sparse, similar to those on pronotum, separated by 2.0-3.0 times their diameter, with a row of evenly spaced setae along margin. Prosternum mat, with sparse setae. Mesoventrite glabrous and impunctate. Metaventrite shiny and glabrous, without distinctly median discrimen; punctures in center large and dense, with short thick setae.

Male genitalia. Penis very long and slender, strongly curved in whole length, apex shortly narrowing and rounded, penis capsule indistinct (Fig. 81). Tegmen rather slender and strongly asymmetrical (Figs 82-83). Penis guide in ventral view widest at base, gradually narrowing to middle, then strongly narrowed and contorted, apical elongate tongue-shape. Left paramere in ventral view short bearing a few long setae, and right piece short but distinctly projecting, bearing a few long setae (Fig. 83). Penis guide in lateral view long and thin, almost straight, with a angular prominence near the base, apex pointed (Fig. 82).

Female genitalia. Genital plate elongate triangular with a rounded apex, slightly concaved in middle of outer margin, apical portion with sparsely setae, stylus long, bearing few setae (Fig. 85). Spermatheca divided into two parts, one of which is somewhat globular with a strong constriction and two pinch-like projections, the other is tubular, becoming slightly more slender distally (Fig. 84).

Type materials.

Holotype: 1♂, China, Yunnan: Longyuan Village, Dulongjiang, Gongshan, 28°1.16'N, 98°18.88'E, ca 1500m, 26.vii.2010, Wang XM leg. (SCAU). Paratypes (46): Yunnan: 7♂♂22♀♀, same data as holotype (5♂♂15♀♀, SCAU; 2♂♂7♀♀, IOZ); 1♂2♀♀, Bapo Village, Dulongjiang, Gongshan, 27°43.84'N, 98°20.71'E, ca 1390m, 1400m, 28.vii.2010, Wang XM leg. (SCAU); 1♀, Maku Village, Dulongjiang, Gongshan, 27°41.11'N, 98°18.19'E, ca 1400m, 28.vii.2010, Wang XM leg. (SCAU); 8♂♂5♀♀, Lushui, Pianma, 26°0.42'N, 98°39.46'E, ca 2300m, 10.viii.2010, Wang XM et al. leg. (5♂♂2♀♀, SCAU; 3♂♂3♀♀, IOZ).

Distribution.

China (Yunnan).

Etymology.

The specific epithet is named after Dulongjiang, the type locality of this ladybird.