Serangium latilobum Wang & Ren

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 : 45-46

Serangium latilobum Wang & Ren sp. n. Figs 1956-6194

Diagnosis.

This species is similar to Serangium japonicum in general appearance, but it can be distinguished from the latter by lager body size, uniform black pronotum without other color and elytra with very conspicuous swelling (Fig. 19). The male genitalia are also diagnostic: penis is moderated stout (Fig. 57), right paramere is indistinct (Fig. 58), penis guide is wide at basal half, sharply narrowed at middle with a finger-shape apex (Fig. 59).

Description.

TL: 2.14-2.18mm, TW: 1.91-1.96mm, TH: 0.99-1.15mm, TL/TW: 1.11-1.12; PL/PW: 0.49-0.53; EL/EW: 0.87-0.88.

Body minute, hemispherical, dorsum strongly convex, shiny and glabrous (Fig. 19). Dorsum uniformly black. Head yellow. Underside black, except prosternum orange. Legs yellowish brown.

Head transverse and ventrally flattened, 0.44 × elytral width (HW/EW=1: 2.29); punctures on frons fine, separated by 0.5-1.5 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, 0.70 × elytral width (PW/EW=1: 1.43), covered in fine punctures associated with long dense setae, punctures similar as those on head, separated by 1.0-2.0 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 few long setae at humeral angles and a row of evenly spaced setae along margin. Prosternum mat, with sparse setae. Mesoventrite glabrous and impunctate, with sparse setae. Metaventrite shiny and glabrous, basal half with distinctly median discrimen; punctures around median discrimen large and dense, with short thick setae, punctures on the rest parts indistinct, with sparse setae.

Male genitalia. Penis strongly curved in whole length, with a small prominence at 1/5, apex slightly curved, penis capsule broadening basally and with indistinct inner and outer processes (Fig. 57). Tegmen rather slender and strongly asymmetrical (Figs 58-59). Penis guide in ventral view wide at basal half, sharply narrowed at middle, then contort, forming a distinct gap in middle, apical half elongate finger-shape. Left paramere in ventral view indistinct, bearing a few long setae, and right piece very short, bearing a few long setae (Fig. 59). Penis guide in lateral view widest at base, gradually tapering to apex, basal 1/5 with a small angular prominence, apex sharply pointed (Fig. 58).

Female genitalia. Genital plate triangular with a rounded apex, slightly concaved in middle, sparsely hairy on the apical portion, stylus rather long, bearing few setae (Fig. 61). Spermatheca divided into two parts, one of which is somewhat globular with a constriction and two small pinch-like projections, the other is short tubular, becoming slightly more slender distally (Fig. 60).

Type materials.

Holotype: 1♂, China, Yunnan: Heiwadi Town, Gongshan, [27°46.48'N, 98°36.16'E], ca 2020m, 19.vii.2010, Wang XM leg. (SCAU). Paratypes (28): Yunnan: 10♂♂17♀♀, same data as holotype (6♂♂10♀♀, SCAU; 4♂♂7♀♀, IOZ); 1♂, Gaoligongshan National Natural Reserve, Baoshan, [24°59.92'N, 99°5.03'E], ca 2000m, 19.ix.2006, Wang XM leg. (SCAU).

Distribution.

China (Yunnan).

Etymology.

The specific epithet formed from the Latin adjective latilobus referring to penis guide which is wide at basal half, sharply narrowed and forming a distinct gap in middle.