Serangium centrale 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 : 43-44

Serangium centrale Wang & Ren sp. n. Figs 6, 81746-5193

Diagnosis.

This species is similar to Serangium magnipunctatum in general appearance, but it is easily distinguished from the latter by sharply pointed penis apex and extremely com plex tegmen (Figs 37-39, 47-49). The male genitalia are similar to S. trimaculatum, but can be distinguished from latter by the shorter left paramere and the apex of penis guide (Figs 44-45, 48-49).

Description.

TL: 2.08-2.27mm, TW: 1.88-1.98mm, TH: 1.09-1.15mm, TL/TW: 1.11-1.15; PL/PW: 0.51-0.52; EL/EW: 0.82-0.92.

Body minute, hemispherical, dorsum strongly convex, shiny and glabrous (Fig. 17). Head yellowish brown, pronotum reddish brown, scutellum dark brown. Elytra reddish brown, with a castaneous area in the middle of suture. Underside yellowish brown, legs yellowish brown.

Head transverse and ventrally flattened, 0.43 × elytral width (HW/EW=1: 2.31); punctures on frons large, separated by 0.2-0.8 times their diameter, with sparse setae; eyes moderately large and coarsely faceted, widest interocular distance 0.54 × head width. Antenna 9-segmented, terminal segment large, elongate oval and flat, apex angular (Fig. 6).

Pronotum short and strongly transverse, 0.70 × elytral width (PW/EW=1: 1.43), densely covered in moderated large punctures associated with long dense setae, punctures slightly smaller than those on head, separated by 0.5-1.5 times their diameter. Punctures on elytra fine and sparse, smaller than those on pronotum, separated by 2.0-4.0 times their diameter, with a few large inside punctures at basal margins and two row of large inner punctures along elytral suture. Prosternum mat, with long dense setae. Mesoventrite small, transverse, surface mat weakly furrowed and impunctate. Metaventrite shiny and glabrous, basal half with inconspicuous median discrimen; punctures fine and sparse, separated by 2.0-4.0 times their diameter.

Male genitalia. Penis long and slender, strongly curved in whole length, apical half of siphon strongly narrowing apical, and apex very thin and sharply pointed, penis capsule broadening basally and without distinct inner and outer processes (Fig. 47). Tegmen strongly asymmetrical and extremely complicate (Figs 48-49). Penis guide relatively short with a distinctly pointed apex, a small gap at right side and a prominence at left side near the apex, bearing a tuft of setae (Fig. 49). Right lateral lobe of tegmen relatively short and wide, bearing a tuft of setae. Left lateral lobe of tegmen slightly longer and narrower than right, without any hairs (Fig. 49). Basal piece of tegmen with a long process.

Female genitalia. Genital plate elongate triangular, apical part of the plate narrow and parallel-sided with a rouned apex, stylus of the genital plate very elongate with a few long setae at its apex (Fig. 51). Spermatheca divided into two globular parts, each with a small pinch-like projection (Fig. 50).

Type materials.

Holotype: 1♂, China, Yunnan: Dadugang, Puer, 22°22.35'N, 100°56.68'E, ca 950m, 26.iv.2008, Wang XM leg. (SCAU). Paratypes (2): 1♂1♀, same data as holotype (SCAU).

Distribution.

China (Yunnan).

Etymology.

The specific epithet formed from the Latin adjective centrale referring to elytra with a central dark spot.