Gynaecoserica digna, 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 : 1537-1539

publication ID	https://doi.org/ 10.1080/00222930902968809
persistent identifier	https://treatment.plazi.org/id/0399C459-DB0A-6F7B-FDBA-FBAD58AE0FA6
treatment provided by	Felipe
scientific name	Gynaecoserica digna
status	sp. nov.

Treatment

Gynaecoserica digna sp. nov.

( Figures 2J–L View Figure 2 , 7A View Figure 7 , 9B View Figure 9 )

Type material examined

Holotype. Ƌ “N Vietnam (Tonkin) pr. Vinh Phu 1990 Tam Dao 6.–9. V. P. Pacholátko leg./ VS 75/ 247 Sericini Asia spec” ( TICB).

Description

Length 4.3 mm, length of elytra 2.5 mm, width 2.3 mm. Body oval, dorsal surface yellowish, head, pronotum and sides of elytra darker, dorsal surface shiny and sparsely setose.

Labroclypeus subrectangular, distinctly wider than long, widest at base, lateral margins subparallel, anterior angles moderately rounded, lateral border and ocular canthus producing a distinct blunt angle, margins weakly reflexed, anterior margin shallowly sinuate medially; surface flat and moderately shiny, finely and very densely punctate, distance between punctures less than their diameter, with a few coarse punctures behind anterior margin each bearing a long, erect seta; frontoclypeal suture indistinctly incised and medially weakly curved; smooth area in front of eye as wide as long; ocular canthus short and slender, smooth, only laterally sparsely punctate, with a fine terminal seta. Frons shiny, posteriorly not dull, with moderately coarse and moderately dense punctures, glabrous except a few short setae beside eyes and behind frontoclypeal suture. Eyes very small, ratio of diameter: interocular width 0.37. Antenna yellow, with 10 antennomeres; club with seven antennomeres, club twice as long as the remaining antennomeres combined. Mentum very weakly elevated and flattened anteriorly.

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

Elytra short and oval, widest at middle, striae weakly impressed vanishing on posterior portion of elytra, coarsely and densely punctate, intervals weakly convex, with sparse, fine punctures, each puncture bears a minute seta, sutural and some of lateral at odd intervals with short yellow setae, interior apical angle of elytra with a robust seta; epipleural edge fine ending at the strongly curved external apical angle of elytra, epipleura sparsely 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: 1.5. Pygidium very acutely convex apically, apical portion directed ventrally, finely and densely punctate, completely dull, without smooth midline, on apical portion with a dense fine setae.

Legs slender and moderately long; femora dull, with two longitudinal rows of setae, finely and sparsely punctate; metafemur shiny and sparsely punctate, sharply margined anteriorly and without a submarginal serrate line, posterior margin weakly convex and glabrous, only weakly widened externally in apical half and not serrate, internally finely serrate, with short setae. Metatibia slender and moderately long, almost uniformly widened posteriorly, widest at middle, ratio width: length: 1: 3.3, 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 and coarse punctures, glabrous; ventrally edged and serrate, with three strong, equally distant spines, internal face finely 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 as long as the following two tarsomeres combined and almost twice as long as the upper tibial spur. Protibia short, bidentate, protarsal claws symmetrical.

Aedeagus shown in Figure 2 View Figure 2 (J–L).

Female unknown.

Diagnosis

Gynaecoserica digna sp. nov. is similar in external shape to G. gisionensis sp. nov., and may be distinguished by the subrectangular shape of the labroclypeus and by the antennal club having seven antennomeres. The latter character distinguishes it from all other Gynaecoserica species.

Etymology

Name derived from the Latin word, dignus, dignified, stately.