Gynaecoserica nahangensis, 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 : 1567-1568

publication ID	https://doi.org/ 10.1080/00222930902968809
persistent identifier	https://treatment.plazi.org/id/0399C459-DB14-6F18-FE46-FF2D598308B1
treatment provided by	Felipe
scientific name	Gynaecoserica nahangensis
status	sp. nov.

Treatment

Gynaecoserica nahangensis sp. nov.

( Figures 4M–O View Figure 4 , 8A View Figure 8 , 9A View Figure 9 )

Type material examined

Holotype. Ƌ “Vietnam-N ( Na Hang ) 160 km NW Ha Noi, NE env. of Na Hang 5.- 10.6.1996 150–200 m lg. A. Napolov & I. Roma ” ( BMNH) . Paratypes. 26 ƋƋ, 18 ♀♀ – same data as holotype ( CNA, CA), 1 Ƌ, 1 ♀ “N Vietnam W Binhlu 1100 m 29.V .1963 Kabakov ” (ZIN), 2 ƋƋ, 2 ♀♀ “N Vietnam W Binhlu 1100 m 1.VI .1963 Kabakov ” (ZIN, CA), 1 Ƌ “N Vietnam Sapa 1600–2000 m 6.8.1962 Kabakov ” ( ZIN), 3 ƋƋ, 3 ♀♀ “ Vietnam N (Sa Pa) Lao Cai Prov., 250 km from Hanoi bearing 31°, Sa Pa vill. env. Hoang Lien Song Nat. Res. 9 .– 15.6.1998 1250 m leg. A. Napolov ” ( CNA, CA), 1 Ƌ “ Vietnam N (Sa Pa) Lao Cai Prov., 250 km from Hanoi bearing 31°, Sa Pa vill. env. Hoang Lien Song Nat. Res. 16 .– 20.6.1998 1250 m leg. A. Napolov ” ( CNA), 1 Ƌ “ Vietnam N 1990 Tam Dao 20–28. VI. Vinh Phu prov. Strnad Jan lgt./ VS 128” ( TICB), 1 Ƌ “ Vietnam, Lao Cai Prov , Sa Pa Distr. Fan Si Pan Mt. 1400–1500 m 26.V.–6.VI.1999 N.L. Orlov / 22°18¢56² N 103°49 ¢35²E” ( ZIN) .

Description

Length 4.0 mm, length of elytra 2.6 mm, width 2.4 mm. Body oval, surface yellowish brown, frons posteriorly a little darker, dorsal surface except head dull and almost glabrous.

Labroclypeus subrectangular, only slightly wider than long, widest at base, lateral margins basally subparallel, anteriorly very 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 (sinuation visible mostly from behind only); surface almost flat and shiny, finely and densely punctate, distance between punctures equal to 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 slender, 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 0.54. Antenna yellow, with 10 antennomeres; club with six antennomeres, club distinctly longer than the remaining antennomeres combined, fourth antennomere not transversely lamella-like. 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 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 and 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 weakly 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 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: 1.76. 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: 2.5, 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 very sparse and coarse 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 4 View Figure 4 (M–O).

Variation

Length 4.0– 4.2 mm, length of elytra 2.6–2.7 mm, width 2.4–2.5 mm. Female: antennal club with three antennomeres, as long as the remaining antennomeres combined.

Diagnosis

Gynaecoserica nahangensis sp. nov. is externally similar to G. marginipes , but the parameres are wider and do not have a basal apophysis while the phallobase has two apical apophyses (one at the right side and one on the left side), and the body colour is entirely yellow.

Etymology

Named according to the type locality Na Hang.