Gynaecoserica bocaki, 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 : 1529-1531

publication ID	https://doi.org/ 10.1080/00222930902968809
persistent identifier	https://treatment.plazi.org/id/0399C459-DB32-6F43-FDA4-FAB0585A0A1E
treatment provided by	Felipe
scientific name	Gynaecoserica bocaki
status	sp. nov.

Treatment

Gynaecoserica bocaki sp. nov.

( Figures 1O–Q View Figure 1 , 6E View Figure 6 , 9B View Figure 9 )

Type material examined

Holotype. Ƌ “ China VI.1990 Dali Leg. Bocák” ( TICB) . Paratypes. 9 ♀♀ same data as holotype ( TICB, BMNH, CA) .

Description

Length 4.7 mm, length of elytra 3.1 mm, width 2.4 mm. Body moderately oval, surface light reddish brown with disc of pronotum and lateral elytral margins widely darker, legs and labroclypeus yellowish brown, dorsal surface except head moderately dull and sparsely setose.

Labroclypeus almost semicircular, distinctly wider than long, widest at base, lateral margins strongly curved and strongly convergent, anterior angles obsolete, lateral border and ocular canthus producing a distinct blunt angle, margins weakly reflexed, anterior margin narrowly sinuate at the middle; surface weakly convex 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 weakly curved medially; smooth area in front of eye approximately 1.2 times as wide as long; ocular canthus short and slender, densely minutely punctate, without a fine terminal seta. Frons completely moderately shiny, with fine, moderately dense punctures, glabrous except a few short setae beside eyes and behind lateral frontoclypeal suture. Eyes small, ratio of diameter: interocular width 0.54. Antenna yellow, composed of 10 antennomeres; club with four antennomeres, as long as the remaining antennomeres combined. Mentum weakly elevated and flattened anteriorly.

Pronotum moderately wide, widest at base, lateral margins weakly curved 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 broad marginal line, basal margin without marginal line; surface with dense and fine punctures, with minute setae in punctures; anterior border sparsely setaceous, lateral border almost glabrous; hypomeron distinctly margined at base but not ventrally produced. Scutellum shorttriangular, with fine and very dense punctures, basally with a large smooth triangular area, microscopic setae present in the punctures.

Elytra short and oval, widest at middle, striae moderately impressed, finely and densely punctate, intervals weakly convex, with fine and moderately dense punctures along the striae, punctures with fine microscopic setae, odd intervals with numerous coarse punctures bearing a robust white seta; epipleural edge robust and sharp 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 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 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: 1.6. Pygidium convex, densely mixed, finely and coarsely punctate, without smooth midline, with sparse robust adjacent yellowish setae in the coarse punctures, otherwise only 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 moderately short setae. Metatibia broad and moderately short, ventromedially convexly widened, widest at middle, ratio width: length: 1: 3.2, 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 very sparse, fine 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 very short, bidentate, protarsal claws symmetrical.

Aedeagus shown in Figure 1 View Figure 1 (O–Q).

Diagnosis

Gynaecoserica bocaki sp. nov. is externally rather similar to G. marginipes (Brenske) but antennal club in male shorter and with four antennomeres only. From all other species with four-segmented club it differs by the small size (<5 mm) and by the absence of a lateral apophysis of phallobase.

Variation

Length 4.7–5.0 mm, length of elytra 2.9–3.1 mm, width 2.4–2.6 mm. Antennal club in female with three antennomeres and distinctly shorter than the remaining antennomeres combined.

Etymology

Named for L. Bocák, the successful collector of the species.