Gynaecoserica ziyardamensis, 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 : 1582-1583

publication ID	https://doi.org/ 10.1080/00222930902968809
persistent identifier	https://treatment.plazi.org/id/0399C459-DB65-6F17-FE37-FF2D58390B7E
treatment provided by	Felipe
scientific name	Gynaecoserica ziyardamensis
status	sp. nov.

Treatment

Gynaecoserica ziyardamensis sp. nov.

( Figures 5Q–S View Figure 5 , 10B View Figure 10 )

Type material examined

Holotype. Ƌ “ Myanmar N (Burma) 65 km NE Putao, 1250 m Zi Yar Dam vill. 18.– 21.05.1998 leg. S. Murzin & V. Sinaev” ( BMNH). Paratypes. 2 ♀♀ “ Myanmar N (Burma) 65 km NE Putao, 1250 m Zi Yar Dam vill. 18.– 21.05.1998 leg. S. Murzin & V. Sinaev ” ( BMNH, CA).

Description

Length 4.4 mm, length of elytra 3.2 mm, width 2.7 mm. Body moderately oblong, surface dark reddish brown, elytra partly yellowish, dorsal surface except head dull and sparsely erectly setose.

Labroclypeus only slightly wider than long, widest at base, lateral margins strongly convex and convergent to strongly rounded anterior angles, lateral border and ocular canthus producing a distinct blunt angle, margins weakly reflexed, anterior margin shallowly sinuate at middle; surface medially convex, finely and densely punctate, distance between punctures little less than their diameter, with a few coarse punctures behind anterior margin each bearing an 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, almost completely smooth, with a fine terminal seta. Frons shiny, only posteriorly narrowly dull, with fine, moderately dense punctures, with a few setae beside eyes and behind frontoclypeal suture. Eyes small, ratio of diameter: interocular width 0.56. Antenna yellow, with 10 antennomeres; club with four antennomeres, club as long as the remaining antennomeres combined. Mentum weakly elevated and flattened anteriorly.

Pronotum moderately wide, widest at base, lateral margins weakly curved and moderately evenly convergent anteriorly, anterior angles strongly produced and sharp, posterior angles blunt, anterior margin weakly produced medially, with a fine marginal line, basal margin without marginal line; surface mixed with dense fine and coarse sparse punctures, fine punctures each with a minute seta, coarse puncture each with a robust erect setae; anterior and lateral borders moderately setose; hypomeron distinctly margined at base but not ventrally produced. Scutellum short triangular, with fine, dense punctures, on base medially smooth, minute setae present in the punctures.

Elytra moderately long, widest at middle, second and third interval posteriorly partly yellowish brown, striae feebly impressed, finely and densely punctate, intervals weakly convex, with fine and moderately dense punctures concentrated along the striae, punctures with very minute setae, additionally odd intervals along each side with a few single coarse punctures each bearing a robust white erect seta (setae partly erased in the holotype), interior apical angle of elytra without a strong seta; epipleural edge sharp, ending at the strongly curved external apical angle of elytra, epipleura sparsely but robustly 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, last sternite medially half as long as the penultimate one. Mesosternum between mesocoxae as wide as mesofemur, with irregularly scattered very strong setae. Ratio of length of metepisternum: metacoxa: 1: 1.85. Pygidium moderately convex medially, finely and densely punctate, without smooth midline, with moderately dense robust setae, otherwise with minute setae in the punctures.

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 moderately slender and moderately long, medially convexly widened, widest at middle, ratio width: length: 1: 3.0, dorsally distinctly 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, fine punctures, glabrous; ventrally sharply carinate and serrate, with three strong, equidistant spines, medial face impunctate, 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 5 View Figure 5 (Q–S).

Variation

Length 4.0– 4.4 mm, length of elytra 3.1–3.2 mm, width 2.6–2.7 mm. Female: coloration yellowish brown; antennal club composed of three antennomeres, little shorter than the remaining antennomeres combined.

Diagnosis

Gynaecoserica ziyardamensis sp. nov. is externally similar to G. hirsuta sp. nov. and G. rostrata sp. nov. It may be differentiated from both by the long and slender parameres being more than half as long as the phallobase, both parameres are together at base about one-quarter as wide as the length of the parameres.

Etymology

Named according to the type locality Zi Yar Dam .