Gynaecoserica lohitensis, 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 : 1555-1557

publication ID	https://doi.org/ 10.1080/00222930902968809
persistent identifier	https://treatment.plazi.org/id/0399C459-DB18-6F6D-FE55-FA5D583B0B6E
treatment provided by	Felipe
scientific name	Gynaecoserica lohitensis
status	sp. nov.

Treatment

Gynaecoserica lohitensis sp. nov.

( Figures 3M–O View Figure 3 , 10B View Figure 10 )

Type material examined

Holotype. Ƌ “ Assam Front.; Lohit Valley 2,000–3,000 ft. 21–31.iii.1933 / F. Kingdon Ward & R. J.H. Kaulback. B.M. 1934–41/ 481 Sericini Asia spec.” ( BMNH) . Paratypes. 3 ƋƋ, 1 ♀ “E Tibet, Bomi env. 1997 29°52¢N, 95°45¢E, 9–10.VII. mixed forest., cca 3000 m, M. Trýzna & O. Šafránek lgt.” ( TICB), 4 ♀♀ “E Tibet, Bomi env. 3000 m, 29°52¢N, 95°45¢E mixed forest, 9–10.VII.1997 Jaroslav Turna leg.” ( TICB) 1 Ƌ, 1 ♀ “China-S Sichuan, 1997 Daliang Shan mts. 27.VII. road Meigu-Leibo pass 15 km NE Meigu 28°25¢N, 103°17¢ E M. Trýzna & O. Šafránek lgt.” ( TICB) .

Description

Length 4.5 mm, length of elytra 3.0 mm, width 2.5 mm. Body oblong, dorsal surface dark brown, antenna yellowish, dorsal surface dull, sparsely setose.

Labroclypeus widest shortly before base, lateral margins moderately curved, anteriorly strongly convergent to strongly rounded anterior angles, lateral border and ocular canthus producing a distinct blunt angle, margins weakly reflexed, anterior margin shallowly sinuate medially; surface distinctly convex medially and shiny, finely but deeply and very 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 medially moderately curved; smooth area in front of eye approximately as wide as long; ocular canthus short and slender, finely and densely punctate, without terminal seta. Frons shiny, only posteriorly dull, with fine, dense punctures, glabrous except some erect setae behind frontoclypeal suture and beside eyes. Eyes moderately large, ratio of diameter: interocular width 0.58. Antenna yellow, with 10 antennomeres; club dark, with six antennomeres, 1.5 times as long as the remaining antennomeres combined, fifth antennomere half as long as club. Mentum weakly elevated and flattened anteriorly.

Pronotum moderately wide, widest at base, lateral margins straight and subparallel in basal half, in anterior half weakly curved and convergent anteriorly, anterior angles strongly produced and moderately sharp, posterior angles blunt, anterior margin convexly produced medially, with a distinct fine marginal line, basal margin without marginal line; surface with dense and fine punctures, with sparsely scattered fine white short or long setae in the punctures, which are bent backwards; anterior and lateral borders thinly setaceous; hypomeron distinctly margined at base but not ventrally produced. Scutellum narrow and short, triangular, with sparse, fine punctures, which are apically very shallow, medially smooth, microscopic setae present in the punctures.

Elytra moderately long, widest shortly behind the middle, striae feebly impressed and finely and densely punctate, intervals weakly convex, with fine and moderately dense punctures concentrated along the striae, punctures with fine white adjacent setae, odd intervals with single coarse punctures bearing a strong yellowish seta, which are erect or adjacent, 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 almost half 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: 1.4. Pygidium strongly convex at apex, coarsely and densely punctate, with broad smooth midline, surface dull, with numerous long setae.

Legs slender and moderately long; 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, its external part only weakly widened in apical half and not serrate, internally finely serrate, with short setae. Metatibia slender and moderately long, uniformly widened toward apex, ratio width: length 1: 3.3, dorsally distinctly edged, with two groups of spines, basal one at onethird, apical one at three-quarters of metatibial length, basally with a few single, fine spines in the punctures; external face longitudinally convex, with sparse and moderately coarse punctures, glabrous; ventrally edged and serrate, with three strong spines, of which the two distal are widely separated, 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 slightly shorter than the following two tarsomeres combined and almost twice as long as the upper tibial spur. Protibia moderately long, bidentate, protarsal claws symmetrical.

Aedeagus shown in Figure 3 View Figure 3 (M–O).

Variation

Length 4.5–5.3 mm, length of elytra 3.0– 3.6 mm, width 2.5–2.8 mm. Width of labroclypeus varies considerably, pilosity of dorsal surface sometimes less dense or very minute only, coloration from uniformly reddish brown to dark brown. Female: antennal club with three antennomeres, distinctly shorter than the remaining antennomeres combined.

Diagnosis

Gynaecoserica lohitensis sp. nov. is rather similar to G. marginipes (Brenske) and G. seinghkuensis sp. nov. in general shape of parameres; all share the basally produced parameres. Gynaecoserica lohitensis may be differentiated from G. marginipes by the more oblong body shape, by the narrower labroclypeus and by the presence of pilosity on the dorsal surface as well as by shape of the parameres. From G. seinghkuensis it differs by the antennal club having only six antennomeres and by the parameres shape – its distal portion is distinctly shorter.

Etymology

Named according to the type locality Lohit Valley .