Gynaecoserica amara, 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 : 1522-1524

publication ID	https://doi.org/ 10.1080/00222930902968809
persistent identifier	https://treatment.plazi.org/id/0399C459-DB39-6F4C-FE61-FB8D580C0C53
treatment provided by	Felipe
scientific name	Gynaecoserica amara
status	sp. nov.

Treatment

Gynaecoserica amara sp. nov.

( Figures 1D–F View Figure 1 , 6B View Figure 6 , 9B View Figure 9 )

Type material examined

Holotype. Ƌ “China-Yunnan 14.–21.6. 100 km W Baoshan , 1993 Gaoligongshan Nat. Res. E. Jendek & O. Šauša ” ( TICB) . Paratype. 1 Ƌ “ Yunnan 2200–2500 m 24,57 N 98,45 E 8–16/5 Gaoligong mts. Vit Kubán leg. 1995/ CS 11 ” ( CA) .

Description

Length 4.8 mm, length of elytra 3.3 mm, width 2.8 mm. Body oblong, dorsal surface dark brown, antenna yellowish brown, dorsal surface dull, very sparsely setose.

Labroclypeus subrectangular, widest at base; lateral margins subparallel; anterior angles strongly rounded; lateral border and ocular canthus producing a distinct blunt angle; margins weakly reflexed, anterior margin very shallowly sinuate medially; surface weakly convex medially and shiny, finely and densely punctate, distance between punctures less than their diameter, with a few coarser punctures behind anterior margin bearing long, erect setae; frontoclypeal suture feebly incised and slightly elevated, medially moderately curved; smooth area in front of eye approximately as wide as long; ocular canthus short and moderately slender, finely and densely punctate, with a short terminal seta. Frons shiny, in posterior half dull, with fine, dense punctures, a few erect setae behind frontoclypeal suture. Eyes small, ratio of diameter: interocular width 0.5. Antenna yellow, with 10 antennomeres; club dark, with five antennomeres, 1.5 times as long as the remaining antennomeres combined. Mentum weakly elevated and flattened anteriorly.

Pronotum widest at base, lateral margins straight and weakly convergent anteriorly in basal half, in anterior half weakly curved and more strongly convergent anteriorly, anterior angles distinctly produced and sharp, posterior angles blunt, anterior margin convexly produced medially, with a fine marginal line, basal margin without marginal line; surface with moderately dense and fine punctures, with a few fine long setae only, each puncture bears a minute seta; anterior and lateral borders thinly setaceous; hypomeron distinctly margined at base but not ventrally produced. Scutellum long and narrow, triangular, with fine and moderately dense punctures, medially narrowly smooth, microscopic setae present in the punctures.

Elytra moderately long, widest in apical third, striae feebly impressed and finely and densely punctate, intervals almost flat, with fine, sparsely scattered punctures concentrated along the striae, punctures with microscopic setae only, but odd intervals with a few white single robust setae; interior apical angle of elytra with a robust 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 almost as long as penultimate one. Mesosternum between mesocoxae as wide as mesofemur, with irregularly scattered very strong setae. Ratio of length of metepisternum: metacoxa: 1: 1.43. Pygidium strongly convex at apex, coarsely and moderately densely punctate, with moderately broad smooth midline, surface dull, with a few long setae.

Legs slender and moderately long; femora dull, with two longitudinal rows of setae, finely and sparsely punctate; metafemur dull, sharply margined anteriorly and without a submarginal serrate line, posterior margin weakly convex and glabrous, its external part only weakly widened in apical half and not serrate, internally very finely serrate, with a few long setae. Metatibia slender and moderately long, uniformly widened toward apex, ratio width: length 1: 3.3, dorsally longitudinally convex, indistinctly edged only in distal third, with two groups of spines, basal group at one-third, apical group at three-quarters of metatibial length, basally with a few single, fine spines in the punctures; external face longitudinally convex, with sparse and very fine punctures, glabrous; ventrally edged and serrate, with three strong equidistant spines, internal face finely sparsely 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 little shorter than the following two tarsomeres combined and twice as long as the upper tibial spur. Protibia moderately long, bidentate, protarsal claws lacking in holotype.

Aedeagus is shown in Figure 1 View Figure 1 (D–F).

Variation

Length 4.8–5.3 mm, length of elytra 3.3–3.6 mm, width 2.8–3.0 mm. Protarsal claws symmetrical. Female unknown.

Diagnosis

Gynaecoserica amara sp. nov. is very similar to G. alma sp. nov. in habitus and shape of aedeagus; it may be differentiated from this species by the smaller size and by the narrower aedeagus.

Etymology

Name derived from the Latin adjective amara , bitter, acid.