Gynaecoserica densipunctata, 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 : 1535-1537

publication ID	https://doi.org/ 10.1080/00222930902968809
persistent identifier	https://treatment.plazi.org/id/0399C459-DB34-6F79-FE4C-FA3D586B0DFE
treatment provided by	Felipe
scientific name	Gynaecoserica densipunctata
status	sp. nov.

Treatment

Gynaecoserica densipunctata sp. nov.

( Figures 2G–I View Figure 2 , 6H View Figure 6 , 10A View Figure 10 )

Type material examined

Holotype. Ƌ “Thai 17–19.V.1993 Lom Sak - Dan Sai Pacholatko & Dembicky leg./ TS 130/ 61 Sericini Asia spec.” ( TICB) . Paratypes. 7 ƋƋ, 1 ♀ same data as holotype ( TICB, CA) .

Description

Length 4.0 mm, length of elytra 2.6 mm, width 2.6 mm. Body oval, surface dark reddish brown, labroclypeus reddish, legs yellowish, dorsal surface except head dull and sparsely setose.

Labroclypeus subrectangular, distinctly wider than long, widest at base, lateral margins basally feebly curved and convergent, anteriorly 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 straight; surface almost flat and shiny, finely and densely punctate, distance between punctures equal 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 1.5 times as wide as long; ocular canthus short and slender, sparsely punctate, without 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 0.48. Antenna yellow, with 10 antennomeres; club with three antennomeres, club distinctly shorter than the remaining antennomeres combined, seventh antennomere not transversely lamella-like produced. Mentum weakly elevated and flattened anteriorly.

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

Elytra short and oval, widest at middle, striae deeply impressed, finely and densely punctate, intervals distinctly convex, with fine and moderately dense punctures along the striae, punctures with fine microscopic setae only, odd intervals with numerous 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 border, 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: 1.81. Pygidium moderately 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 broad and short, medially convexly widened, widest at middle, ratio width: length: 1: 2.67, 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 four strong, equally distant spines, internal face not punctate and smooth, 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 as long as 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 2 View Figure 2 (G–I).

Variation

Length 4.0– 4.1 mm, length of elytra 2.6–2.7 mm. Female: antennal club as in male.

Diagnosis

Gynaecoserica densipunctata sp. nov. is externally similar to G. marginipes (Brenske) , but the antennal club in male is much shorter having three antennomeres only; the parameres are wider and the phallobase does not possess a lateral apophysis.

Etymology

Name derived from combined Latin words, densus and punctatus, densely punctate (with reference to the punctation of the dorsal surface).