Serangium contortum 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 : 54-55

Serangium contortum Wang & Ren sp. n. Figs 2486-9195

Diagnosis.

This species is easily recognized by its metaventrite without median discrimen and the contorted penis guide (Figs 88-89).

Description.

TL: 1.62-1.78mm, TW: 1.42-1.58mm, TH: 0.69-0.96mm, TL/TW: 1.13-1.14; PL/PW: 0.48-0.49; EL/EW: 0.83-0.91.

Body minute, hemispherical, dorsum strongly convex, shiny and glabrous (Fig. 24). Dorsum uniformly black. Head yellow. Underside reddish brown, except meso- and metaventrite black. Legs yellowish brown, except femora reddish brown.

Head transverse and ventrally flattened, 0.42 × elytral width (HW/EW=1: 2.40); punctures on frons moderately large, separated by 0.5-1.5 times their diameter, with sparse setae; eyes moderately large and coarsely faceted, widest interocular distance 0.53 × head width. Antenna 9-segmented, terminal segment large, elongate oval and flat, apex angular.

Pronotum short and strongly transverse, 0.72 × elytral width (PW/EW=1: 1.39), covered in fine inconspicuous punctures associated with long dense setae, punctures slightly smaller than those on head, separated by 1.0-1.5 times their diameter. Punctures on elytra fine and sparse, smaller than those on pronotum, separated by 2.0-3.0 times their diameter, with a row of evenly spaced setae along margin. Prosternum mat, punctures fine and inconspicuous, with sparse setae. Mesoventrite glabrous. Metaventrite shiny and glabrous, without distinctly b median discrimen; 5-6 large and dense punctures forming two cluster in the center, with short thick setae, punctures on the rest parts indistinct, with sparse setae.

Male genitalia. Penis long and stout, strongly curved in whole length, apex strongly narrowing and rounded, penis capsule indistinct (Fig. 87). Tegmen rather slender and strongly asymmetrical (Figs 88-89). Penis guide in ventral view strongly contorted in middle. Left paramere in ventral view short bearing a few long setae, and right piece short but distinctly projecting, bearing a few long setae (Fig. 89). Penis guide in lateral view wide in basal half, then sharply narrowed, apical half very thin, apex pointed (Fig. 88).

Female genitalia. Genital plate elongate triangular with a rounded apex, distinctly concaved in middle of outer margin, apical portion with sparsely setae, stylus long, bearing few setae (Fig. 91). Spermatheca divided into two parts, one of which is somewhat globular with a feeble constriction and two pinch-like projections, the other is tubular, becoming slightly more slender distally (Fig. 90).

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 (10): Yunnan: 4♂♂4♀♀, same data as holotype (2♂♂2♀♀, SCAU; 2♂♂2♀♀, IOZ); Guangxi: 1♂, Jiuniutang, Maoershan National Natural Reserve, Guilin, 25°50.55'N, 110°22.85'E, ca 1390m, 18.x.2004, Wang XM leg. (SCAU); Hubei: 1♂, Wudangshan, Shiyan, 32°24.50'N, 111°1.31'E, ca 1090m, 17.vii.1997, Peng ZQ leg. (SCAU).

Distribution.

China (Guangxi, Hubei, Yunnan).

Etymology.

The specific epithet formed from the Latin adjective contortus, referring to contorted penis guide of tegmen.