Serica nanhua Ahrens, Fabrizi & Liu 2022, new species

Serica nanhua Ahrens, Fabrizi & Liu, new species

Figures 6A–D, 22

Type material examined. Holotype: ♂ “ Nanhua, Yunnan, 7.V.1982, 2400m, leg. Yu Peiyu ” (IZAS). Paratypes: 9 ♂♂, 1 ♀ “ China, W Yunnan prov., mts. 60km E Tengchong, 2300m, 14.-19.v.2006, S. Murzin & I. Shokhin ” (CP, ZFMK), 3 ♂♂, 5 ♀♀ “ China, W Yunnan prov., mts. 60km E Tengchong, 2300m, 19.-22.v.2006, S. Murzin & I. Shokhin ” (CP, ZFMK).

Description of the holotype. Length: 8.4 mm, elytral length: 6.0 mm, width: 4.4 mm. Body oblong, dark reddish brown, dull, legs brown, antenna yellow, with numerous short and long setae on dorsal surface.

Labroclypeus moderately wide, trapezoidal, lateral margins convex and moderately convergent, producing a distinct angle with ocular canthus; anterior angles strongly rounded; anterior margin moderately sinuate medially, margins strongly reflexed; surface flat, finely and densely punctate, with numerous long and erect setae; frontoclypeal suture indistinct, curved; ocular canthus moderately short and narrow (1/3 of ocular width), finely and densely punctate, with 1–3 short terminal setae. Frons with dull toment, with coarse, dense punctures and numerous long setae. Antenna with nine antennomeres, club with three antennomeres, twice as long as remaining antennomeres combined, moderately reflexed. Eyes large, ratio diameter/ interocular width: 0.83. Mentum convexly elevated and flattened anteriorly.

Pronotum widest in posterior third, lateral margins evenly convex and convergent anteriorly and posteriorly; anterior angles almost blunt and weakly produced, posterior angles blunt; anterior margin strongly convex, marginal line complete; basal margin without marginal line; surface with mixed coarse and fine, dense punctures, with numerous short and longer erect or forward-directed yellow setae. Hypomeron very weakly carinate ventrally. Scutellum narrow and long, triangular, with fine, dense punctation, at base with a smooth impunctate triangular area, with numerous short adjacent setae.

Elytra narrow, elongate, widest in posterior third, striae distinctly impressed, finely punctate, intervals weakly convex, finely and densely punctate, punctures concentrated along striae, elytra with dense, long erect setae, minute setae absent; epipleural margin robust, ending at strongly rounded external apical angle of elytra, sparsely setose; apex of elytra with a fine membraneous rim of short microtrichomes.

Ventral face coarsely and densely punctate, only metasternal plate and lateral metacoxa with a few long setae. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/ metacoxa: 1/ 1.54. Abdominal sternites finely and moderately densely punctate, each with a row of coarse punctures bearing each a robust seta, otherwise glabrous. Pygidium moderately convex, finely and densely punctate, with dense, long setae.

Legs long and narrow, shiny; femora finely and sparsely punctate, with two longitudinal rows of setae. Metafemur with anterior margin acute, without adjacent serrated line; posterior ventral margin almost straight, weakly widened in apical half, ventrally and dorsally not serrated, sparsely setose. Metatibia long and narrow, widest at apex, ratio width/ length: 1/ 3.9, sharply carinate dorsally, with four groups of spines, basal one at first quarter, second one at middle, third one at two thrids, apical one at four fifths of metatibial length, basally glabrous; lateral face longitudinally convex, finely and irregularly densely punctate, glabrous; apex concavely and narrowly sinuate interiorly near tarsal articulation. Tarsomeres finely punctate dorsally, with moderately dense, fine setae ventrally; metatarsomeres ventrally with a strongly serrated carina, subventrally with a second, smooth longitudinal carina; first metatarsomere little shorter than following two tarsomeres combined and as long as dorsal tibial spur. Protibia long, bidentate; anterior claws symmetric, interior tarsal claws sharply pointed.

Aedeagus: Fig. 6A–C. Habitus: 6D.

Diagnosis. Serica nanhua Ahrens, Fabrizi & Liu, new species differs from Serica longipes Ahrens, Fabrizi & Liu, new species by the distinctly less curved left paramere.

Etymology. The name of the new species (noun in apposition) is derived from the type locality, Nanhua.

Variation. Length: 8.4–9.2 mm, elytral length: 6.0– 6.9 mm, width: 4.4–4.9 mm. The shape of pronotum may considerably variate, in some specimens widest at base with margin in basal half straight and subparallel, as in S. longipes. Female: antennal club short, as long as remaining antennomeres combined; pygidium weakly convex; eyes much smaller than in male, ratio diameter/ interocular width: 0.55.