Gynaecoserica jelineki, 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 : 1549-1551

Gynaecoserica jelineki sp. nov.

( Figures 3D–F , 10B )

Type material examined

Holotype. Ƌ “Mus. Pragense Tenasserim Coll. Helfer ” ( NMPC).

Description

Length 4.2 mm, length of elytra 2.8 mm, width 2.4 mm. Body oval, dorsal surface dark brown, antenna yellowish, dorsal surface dull and glabrous.

Labroclypeus only slightly wider than long, widest at base, lateral margins weakly curved and moderately convergent to moderately rounded anterior angles, lateral border and ocular canthus producing a distinct blunt angle, margins weakly reflexed, anterior margin shallowly sinuate medially; surface feebly convex medially and moderately 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 1.5 times as wide as long; ocular canthus very short and broad, finely and sparsely punctate, with a long terminal seta. Frons shiny, in posterior third dull, with fine, dense punctures, glabrous except a few short setae beside eyes and behind frontoclypeal suture. Eyes small, ratio of diameter: interocular width 0.44. Antenna yellow, with 10 antennomeres; club dark brown, with six antennomeres, club a little longer than the remaining antennomeres combined. Mentum weakly elevated and flattened anteriorly.

Pronotum moderately wide, widest shortly before base, lateral margins evenly and weakly curved and convergent anteriorly, anterior angles strongly produced and moderately sharp, posterior angles blunt, anterior margin very weakly produced medially, with a distinct fine marginal line, basal margin without marginal line; surface with moderately dense and very fine punctures, with microscopic setae in punctures only; anterior and lateral borders setaceous; hypomeron distinctly margined at base but not ventrally produced. Scutellum narrow and short, triangular, with fine, dense punctures, medially not smooth, microscopic setae present in the punctures.

Elytra moderately long and egg-shaped, widest shortly behind the middle, striae indistinctly impressed and finely and densely punctate, intervals weakly convex, with fine and moderately dense punctures concentrated along the striae, punctures with fine microscopic setae, sutural interval in posterior half with single coarse punctures bearing strong setae, 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 twice 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: 1.57. Pygidium weakly convex, finely and very densely punctate, without smooth midline, with dense and long setae on distal portion.

Legs moderately slender and short; femora dull, with two longitudinal rows of setae, finely and sparsely punctate; metafemur shiny and almost impunctate, 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 slender and short, medially convexly widened, widest at apex, ratio width: length: 1: 3.3, dorsally sharply edged, with two groups of spines, basal one at one-third, apical one at twothirds of metatibial length, basally with a few single, fine spines in the punctures; external face longitudinally convex, with moderately dense and coarse punctures, glabrous; ventrally edged and serrate, with three 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 moderately long, bidentate, protarsomeres rather short, protarsal claws asymmetrical, basal tooth of interior claw small and lobiform, with a blunt angle at base.

Aedeagus shown in Figure 3 (D–F).

Female unknown.

Diagnosis

The new species may be differentiated from the remaining representatives of Gynaecoserica by the asymmetrical protarsal claws, by the dark brown and monochrome elytra, and the short and stout protarsomeres, with the tarsomeres II to IV being as long as wide.

Etymology

The new species is named in honour of Josef Jelínek (NMPC).

Figures

Figure 3. (A–C) Gynaecoserica ignobilis sp. nov. (holotype), (D–F) G. jelineki sp. nov. (holotype), (G–I) G. keithi sp. nov. (holotype), (J–L) G. lobiceps sp. nov. (holotype), (M–O) G. lohitensis sp. nov. (holotype), (P–R) G. lomsakensis sp. nov. (holotype). (A, D, G, J, M, P) Aedeagus, left side lateral view; (C, F, I, L, O, R) aedeagus, left side lateral view; (B, E, H, K, N, Q) parameres, dorsal view. Scale bars 0.5 mm.

Figure 10. Distribution of Gynaecoserica species (A, upper panel; B, lower panel). “?” indicates the rather imprecise type locality (Tenasserim) of G. jelineki sp. nov. in Myanmar.