Maladera guangzhaishanica Ahrens, Fabrizi & Liu, 2021

Fabrizi, Silvia, Liu, Wan-Gang, Bai, Ming, Yang, Xing-Ke & Ahrens, Dirk, 2021, A monograph of the genus Maladera Mulsant & Rey, 1871 of China (Coleoptera: Scarabaeidae: Melolonthinae: Sericini), Zootaxa 4922 (1), pp. 1-400 : 184-185

Maladera guangzhaishanica Ahrens, Fabrizi & Liu , sp. n.

Figures 41 E–H, 108

Type material examined. Holotype: ♂ “ China, SW Fujian, 28.iv.-24.VII. Guang Zhai Shan 25°42’N 116°47’E, 450-480m Jaroslav Turna leg., 2006/ 783 Sericini Asia spec.” ( ZFMK) . Paratype: 1 ♂ “[ China] Baimianshan Yanling, F-Henugu, 1.X.2003, Leg. Li et al. ” ( ZFMK) , 1 ♂ “[ China] Mt. Lushan , Jiangxi, 10.V.1977, leg. Zhang Youwei” ( IZAS) .

Description. Length: 10.2 mm, length of elytra: 7.9 mm, width: 6.4 mm. Body wide, oval, reddish brown, antenna yellowish brown, dorsal surface dull, labroclypeus, tarsomeres, and tibiae shiny, glabrous.

Labroclypeus wide, lateral margins weakly convex and moderately convergent, lateral margins produce with ocular canthus an indistinct angle, anterior angles convex, anterior margin shallowly emarginate medially, margins weakly reflexed; surface weakly shiny, widely dull at base, surface convex medially, finely and densely punctate, distance between punctures smaller their diameter, with a few long erect setae; smooth area in front of eyes three times as wide as long; frontoclypeal suture finely incised, bluntly angled medially; ocular canthus moderately wide and short (1/3 of ocular diameter), finely and densely punctate, without a short terminal seta. Eyes small, ratio diameter/ interocular width: 0.58. Frons with fine and moderately dense punctures, with a few single setae beside eyes. Antenna with ten antennomeres, club with three antennomeres and straight, distinctly shorter than remaining antennomeres combined. Mentum convexly elevated and flattened anteriorly.

Pronotum widest at base, lateral margins weakly convex and weakly convergent anteriorly, anterior angles sharp and distinctly produced; anterior margin convex, with widely interrupted marginal line; basal margin without marginal line; surface finely and densely punctate, punctures with microscopic setae only, setae of lateral and anterior margin sparse; hypomeron carinate. Scutellum wide, triangular, punctation as in pronotum.

Elytra (left elytron slightly deformed in holotype) widest at posterior third, striae finely impressed, finely punctate, intervals flat, finely and densely punctate, with minute setae in punctures, odd intervals with a few erect short setae; epipleura 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, nearly glabrous, only metasternal plate and lateral metacoxa with a few robust setae. Mesosternum between mesocoxae wide, as wide as mesofemur. Ratio of length of metepisternum/ metacoxa: 1/1.71. Abdominal sternites finely and moderately densely punctate, each with a row of coarse punctures bearing each a robust seta. Pygidium strongly convex, coarsely and densely punctate, long setae on apical margin absent.

Legs moderately long and wide; femora superficially and sparsely punctate, with two longitudinal rows of setae. Metafemur shiny, anterior margin acute, without adjacent serrated line, anterior longitudinal row of setae absent; posterior ventral margin almost straight, not widened in apical half, neither ventrally nor dorsally serrated but smooth, glabrous. Metatibia short and wide, flattened, ratio width/length: 1/2.9, sharply carinate dorsally, with two groups of spines, basal one at basal third, apical one at three quarters of metatibial length, basally with a few robust and short setae; lateral face weakly longitudinally convex, with a very superficial fine punctures; medial face impunctate, apex shallowly and concavely emarginate interiorly near tarsal articulation. Tarsomeres sparsely finely punctate dorsally, with dense, fine setae ventrally; metatarsomeres ventrally glabrous, with a strongly serrated carina, subventrally with a second, smooth longitudinal carina; first metatarsomere as long as following two tarsomeres combined, little longer than dorsal tibial spur. Protibia short, bidentate. Anterior claws symmetrical.

Aedeagus: Fig. 41 E–G. Habitus: Fig. 41H . Female unknown.

Diagnosis. Maladera guangzhaishanica Ahrens, Fabrizi & Liu , sp. n. is very similar to Maladera guanxiamensis Ahrens, Fabrizi & Liu , sp. n. in habitus and shape of the aedeagus. The former is distinguished in having the left paramere wider (lateral view) and the right paramere shorter and strongly pointed (both in lateral view).

Etymology. The name of the new species is derived from its type locality, Guang Zhai Shan (adjective in the nominative singular).

Variation. Length: 9.9–10.2 mm, length of elytra: 7.0– 7.9 mm, width: 5.6–6.4 mm.

Distribution. See map ( Fig. 108 ) and Table 1.

Figures

FIGURE 41. A–D: Maladera guanxianensis Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. guangzhaishanica Ahrens, Fabrizi & Liu, sp. n. (holotype); I–L: M. shiruguanensis Ahrens, Fabrizi & Liu, sp. n. (holotype). A, E, I: aedeagus, left side lateral view; C, G, K: parameres, dorsal view; D, H, L: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 108. Distribution of the Maladera granuligera group: Maladera baoxingensis sp. n., M. guangzhaishanica sp. n., M. guanxianensis sp. n., M. lushanensis sp. n..