Gynaecoserica bicolorata, Ahrens & Fabrizi, 2009

Ahrens, Dirk & Fabrizi, Silvia, 2009, A review of the genus Gynaecoserica Brenske, 1896 (Coleoptera, Scarabaeidae, Sericini), Journal of Natural History 43 (25 - 26), pp. 1505-1584 : 1528-1529

publication ID	https://doi.org/ 10.1080/00222930902968809
persistent identifier	https://treatment.plazi.org/id/0399C459-DB33-6F41-FE1C-FF2D5FBD0AF3
treatment provided by	Felipe
scientific name	Gynaecoserica bicolorata
status	sp. nov.

Treatment

Gynaecoserica bicolorata sp. nov.

( Figures 1L–N View Figure 1 , 6D View Figure 6 , 9A View Figure 9 )

Type material examined

Holotype. Ƌ “NE India, Meghalaya state West Garo Hills reg., Tura 5.–7.V.1996 alt 700+ 100 m, GPS N 25°30.7 ¢ E 90°13.9 ¢ ( WGS 84 ) E. Jendek & O. Šauša leg./ 58 Sericini Asia spec.” ( TICB). GoogleMaps

Description

Length 4.7 mm, length of elytra 3.0 mm, width 2.7 mm. Body oblong oval, surface yellowish brown, elytra and frons dark brown, dorsal surface shiny and sparsely setose.

Labroclypeus subtrapezoidal, widest at base, lateral margins moderately curved and convergent to strongly rounded anterior angles, lateral border and ocular canthus producing a distinct blunt angle, margins weakly reflexed, anterior margin medially very feebly sinuate; surface medially weakly convex, finely and densely punctate, distance between punctures partly less than their diameter, with a few coarse punctures immediately behind anterior margin bearing short fine setae; frontoclypeal suture very indistinctly incised and medially weakly curved; smooth area in front of eye approximately 1.5 times as wide as long; ocular canthus short and triangular, almost smooth, with a fine terminal seta. Frons shiny, with fine, moderately dense punctures and a single seta near the anterior edge of the eyes. Eyes moderately large, ratio of diameter: interocular width 0.52. Antenna yellow, with 10 antennomeres; club with five antennomeres, club as long as the remaining antennomeres combined, fifth antennomere not transversely produced. Mentum weakly elevated and flattened anteriorly.

Pronotum moderately wide, widest at base, lateral margins in basal half straight and weakly convergent anteriorly, in anterior half moderately curved and more strongly convergent anteriorly towards the strongly produced and sharp anterior angles, posterior angles blunt, anterior margin strongly convexly produced medially, with a broad smooth marginal line, basal margin without marginal line; surface with dense and coarse punctures, without microscopic setae in punctures; anterior and lateral borders not setaceous; hypomeron distinctly margined at base but not ventrally produced. Scutellum narrowly triangular, with fine, dense punctures, microscopic setae not present in the punctures.

Elytra moderately long and oval, widest at middle, striae feebly impressed, coarsely and densely punctate, intervals almost flat, with fine and very sparse punctures concentrated along the striae, punctures mostly glabrous, on sutural intervals with single coarse punctures each bearing a robust white erect seta, interior apical angle of elytra with a strong seta; epipleural edge fine ending at the moderately curved external apical angle of elytra, epipleura sparsely setaceous, apical border without short microtrichomes.

Ventral surface shiny, with fine and moderately dense punctures, sparsely setose, metacoxa only laterally with a few strong adjacent setae; each abdominal sternite with indistinct transverse row of coarse punctures bearing short setae between fine, dense punctation, penultimate sternite apically with a shiny smooth sclerotized bor- der, which is one-sixth as long as sternite, last sternite medially a little shorter than the penultimate one. Mesosternum between mesocoxae as wide as mesofemur, with irregularly scattered very strong setae. Ratio of length of metepisternum: metacoxa 1: 1.6. Pygidium strongly convex, coarsely and moderately densely punctate, without smooth midline, surface shiny and glabrous, beside apical border dull, with a few long setae.

Legs robust and short; femora dull, with two longitudinal rows of setae, finely and sparsely punctate; metafemur shiny, sharply margined anteriorly and without a submarginal serrate line, posterior margin weakly convex and glabrous, ventrally only weakly widened in apical half and not serrate, dorsally finely serrate, with short setae. Metatibia slender and moderately long, widest at apex, ratio width: length: 1: 3.4, dorsally weakly carinate, with two groups of spines, basal group at one-third, apical group at two-thirds of metatibial length, basally with a few single, fine spines in the punctures; external face longitudinally convex, with sparse, fine punctures, glabrous; ventrally edged and serrate, with three strong, equally distant spines, internal face very sparsely punctate, apex interiorly near tarsal articulation sharply and deeply truncate. Tarsomeres dorsally glabrous and impunctate, ventrally with sparse, short setae; metatarsomeres ventrally with a strongly serrate ridge, beside which is a fine longitudinal carina, first metatarsomere distinctly shorter than the following two tarsomeres combined and slightly less than twice as long as the upper tibial spur. Protibia short, bidentate, protarsal claws symmetrical.

Aedeagus is shown in Figure 1 View Figure 1 (L–N).

Female unknown.

Diagnosis

Gynaecoserica bicolorata sp. nov. can be differentiated from the similar G. compacta sp. nov. by the dark colour of elytra, the antennal club with five antennomeres as well as by the shape of parameres and from G. gisionensis sp. nov. by the metatibia being dorsally at least in the apical half moderately carinate.

Etymology

Name derived from the Latin bicoloratus, combined from bi-, two-, and coloratus, coloured.