Microserangium semilunatum Wang & Ren

Wang, Xingmin, Ślipinski, Adam & Ren, Shunxiang, 2013, The genus Microserangium Miyatake (Coleoptera, Coccinellidae) from China, ZooKeys 359, pp. 13-33 : 23-24

Microserangium semilunatum Wang & Ren sp. n. Figures 16, 53-60, 93

Diagnosis.

The male genitalia of this species are similar to Microserangium erythrinum , but this species can be distinguished from the latter by its uniformly dark elytra and semilunate penis guide (Figs 16, 56-57). In Microserangium erythrinum ,theelytral disk is yellow or burgundy with dark brown margins and the penis guide is acutely triangular (Figs 12, 24-25).

Description.

TL: 1.42-1.55mm, TW: 1.24-1.35mm, TH: 0.76-0.86mm, TL/TW: 1.14-1.15; PL/PW: 0.40-0.44; EL/EW: 0.93-0.98; HW/TW: 0.44; PW/TW: 0.73.

Body shiny and glabrous (Fig. 16). Dorsum uniformly black. Head black, clypeus brown. Underside black, legs dark brown, tibiae and tarsi yellow.

Head transverse and ventrally flattened; frontal punctures large and densely distributed, 0.3-1.0 diameter apart, associated with long sparsely distributed setae; eyes round, large and coarsely faceted, widest interocular distance 0.50 × width of head. Antennal club oval and flat, apex blunt (Fig. 59).

Pronotum short and strongly transverse, anterior corner inconspicuous and blunt, mat and shagreened. Pronotal disk with densely distributed large and fine shallow punctures both associated with long sparsely distributed setae. Elytra smooth and shiny, with sparse row of long setae along margins, punctures extremely fine and inconspicuous. Prosternum mat and impunctate. Mesoventrite transverse, very short, surface mat weakly furrowed. Metaventrite shiny and glabrous, punctures fine and sparsely distributed, 2.0-3.0 diameters apart. Meso- and metatibiae strongly angulate externally beyond middle; tarsus with 3 tarsomeres (Fig. 60).

Male genitalia. Penis strongly curved along entire length, apex narrowed and acicular, penis capsule with large outer arm and inconspicuous inner one (Figs 54-55). Tegmen rather slender and strongly asymmetrical. Penis guide in lateral view small, almost straight, apex pointed (Fig. 56), in ventral view small and semilunate (Fig. 57). Parameres conspicuous.

Types.

Holotype ♂: China, Hainan: Bawangling, 19°05.65'N, 109°6.73'E, ca 330m, 21.iii.1996, Peng ZQ leg. Paratypes (12): Hainan: 4♂♂1♀, same data to holotype; 1♂1♀, Bawangling, 19°05.65'N, 109°6.73'E, ca 330m, 3.ix.1998, Peng ZQleg.; 1♂, Bawangling, 19°05.65'N, 109°6.73'E, ca 330m, 20.iv.2000, Peng ZQleg.; 1♂1♀, Diaoluoshan, 18°56.15'N, 109°56.90'E, ca 200m, 26.vii.2006, Wang XM leg.; 1♂, Diaoluoshan, 18°56.15'N, 109°56.90'E, ca 200m, 7.v.2005, Wang XM leg.

Distribution.

China (Hainan).

Etymology.

The specific epithet is formed from the the Latin adjective semilunatus, referring to the semilunate penis guide.