Gynaecoserica ignobilis, 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 : 1548-1549

publication ID	https://doi.org/ 10.1080/00222930902968809
persistent identifier	https://treatment.plazi.org/id/0399C459-DB07-6F75-FE16-FED058860BBE
treatment provided by	Felipe
scientific name	Gynaecoserica ignobilis
status	sp. nov.

Treatment

Gynaecoserica ignobilis sp. nov.

( Figures 3A–C View Figure 3 , 7E View Figure 7 , 9A View Figure 9 )

Type material examined

Holotype. Ƌ “NE India Meghalaya 1999 9 km NW of Jowai ; 1400 m; 25°30¢ N 92°10 ¢E 12.v. Dembický & Pacholátko/ 595 Sericini spec. Asia” ( TICB) . Paratypes. 1 Ƌ same data as holotype ( CA) .

Description

Length 3.9 mm, length of elytra 2.3 mm, width 2.3 mm. Body oval, dorsal surface dark brown, with antenna and legs yellowish brown, pronotal margins reddish brown, surface partly with greenish shine, dorsal surface except head dull and almost glabrous.

Labroclypeus subtrapezoidal, only slightly wider than long, widest at base, lateral margins strongly curved and strongly convergent to strongly rounded anterior angles, lateral border and ocular canthus producing a distinct blunt angle, margins weakly reflexed, anterior margin very shallowly sinuate medially; surface flat and shiny, finely and densely punctate, distance between punctures equals their diameter, with a few coarse punctures behind anterior margin each bearing a long, erect seta; frontoclypeal suture feebly incised and medially weakly curved; smooth area in front of eye approximately as wide as long; ocular canthus short and broadly triangular, smooth, with a fine terminal seta. Frons moderately shiny, only posteriorly dull, with fine, moderately dense punctures, glabrous except a few short setae beside eyes and behind frontoclypeal suture. Eyes small, ratio of diameter: interocular width 0.44. Antenna yellow, with 10 antennomeres; club with five antennomeres, club distinctly longer than the remaining antennomeres combined, fifth antennomere not transversely lamella-like. Mentum weakly elevated and flattened anteriorly.

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

Elytra short and oval, widest at middle, striae feebly impressed, finely and densely punctate, intervals distinctly convex, with fine and moderately dense punctures concentrated along the striae, punctures with fine microscopic setae only, odd intervals with single coarse punctures bearing a short robust white seta, interior apical angle of elytra with a strong seta; epipleural edge fine ending at the strongly curved external apical angle of elytra, epipleura densely setaceous, apical border without short microtrichomes.

Ventral surface dull, 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 longer than the penultimate one. Mesosternum between mesocoxae as wide as mesofemur, with irregularly scattered very strong setae. Ratio of length of metepisternum: metacoxa 1: 1.85. Pygidium strongly convex medially, coarsely and densely punctate, without smooth midline, with moderately dense robust light 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 short, medially convexly widened, widest at middle, ratio width: length: 1: 2.94, dorsally weakly carinate, with two groups of spines, basal one at one-third, apical one 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 four strong, equally distant spines, internal face not punctate and smooth, apex interiorly near tarsal articulation concavely deeply sinuate. 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 slightly shorter than the following two tarsomeres combined and slightly less than twice as long as the upper tibial spur. Protibia very short, bidentate, protarsal claws symmetrical.

Aedeagus shown in Figure 3 View Figure 3 (A–C).

Variation

Length 3.5–3.9 mm, length of elytra 2.1–2.3 mm, width 2.2–2.3 mm. Female unknown.

Diagnosis

Gynaecoserica ignobilis sp. nov. is externally similar to G. marginipes (Brenske) , but its parameres do not possess a basal apophysis and the antennal club of the male has only five antennomeres; the lateral apophysis of the phallobase extends to the dorsal portion of the phallobase.

Etymology

Name derived from the Latin word, ignobilis , ignoble, unknown.