Maladera shoumanensis 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 : 309-310

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

Figures 73 A–D, 127

Type material examined. Holotype: ♂ “ China-Shaanxi, Daba Shan, Shou Man vill., 32°14’N, 108°34’E, 25.v.- 14.vi.2000, 1000m, Siniaev & Plutenko leg./ 827 Sericini : Asia spec.” ( CP) . Paratypes: 1 ♂ “ China—Shaanxi, Daba Shan, Shou Man vill., 32°14’N, 108°34’E, 25.v.-14.vi.2000, 1000m, Siniaev & Plutenko leg.” ( ZFMK) , 1 ♂ “[China] Beiba, Nanzheng , Shaanxi, 19-22.VI.2005, leg. Ba Yibin ” ( HBUM) .

Description. Length: 8.1 mm, length of elytra: 5.8 mm, width: 4.8 mm. Body oval, dark brown, dull, legs brown, antenna yellow, head, tarsomeres, and tibiae shiny, glabrous.

Labroclypeus wide, trapezoidal, lateral margins straight and strongly convergent, producing an indistinct angle with ocular canthus; anterior angles weakly rounded; anterior margin distinctly emarginate medially, margins weakly reflexed; surface weakly convex, densely and very coarsely punctate, distance between punctures less their diameter, punctures frequently fusing with each other, with a few erect setae anteriorly; frontoclypeal suture indistinct, bluntly angled medially; ocular canthus short and wide (1/3 of ocular width), finely and densely punctate, with a short terminal seta. Frons with coarse, dense punctures, posterior half dull, with a few single setae beside eyes, behind frontoclypeal suture, and on posterior disc. Antenna with ten antennomeres, club with three antennomeres, as long as remaining antennomeres combined. Eyes small, ratio diameter/ interocular width: 0.5. Mentum convexly elevated and flattened anteriorly.

Pronotum widest at base, lateral margins in basal half straight and weakly convergent, in anterior half evenly convex and convergent anteriorly; anterior angles sharp and distinctly produced, posterior angles blunt; anterior margin weakly convex, marginal line widely interrupted medially; basal margin without marginal line; surface coarsely and densely punctate, punctures with microscopic setae only, setae of lateral and anterior margin fine but sparse. Hypomeron carinate but not produced ventrally. Scutellum wide, triangular, punctation as on pronotum.

Elytra widest in posterior third, striae distinctly impressed, finely punctate, odd intervals weakly convex, even ones flat, finely and densely punctate, punctures concentrated along striae in odd intervals; 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, nearly glabrous, only metasternal plate and lateral metacoxa with a few robust setae. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/ metacoxa: 1/ 1.33. 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, with a few long setae along apical margin.

Legs long and narrow; femora dull, 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, glabrous. Metatibia moderately long and wide, ratio width/ length: 1/ 3.8, sharply carinate dorsally, with two groups of spines, basal one at one third, apical one at three quarters of metatibial length, basally with a few robust and short setae; lateral face longitudinally convex, coarsely and densely punctate; apex concavely emarginate interiorly near tarsal articulation. Tarsomeres impunctate dorsally, with moderately dense, fine setae ventrally; metatarsomeres ventrally with a strongly serrated carina, subventrally with a second, smooth longitudinal carina; first metatarsomere as long as following two tarsomeres combined, and nearly twice as long as dorsal tibial spur. Protibia moderately long, bidentate; anterior claws symmetric, interior tarsal claws sharply pointed.

Aedeagus: Fig. 73 A–C. Habitus: 73D. Female unknown.

Diagnosis. Maladera shoumanensis Ahrens, Fabrizi & Liu , sp. n. differs from M. jatuai Ahrens, Fabrizi & Liu , sp. n. in that the left paramere has two lobes and the right paramere is simple, as well as by the punctation on head being very coarse and dense.

Etymology. The name of the new species (adjective in the nominative singular case) is derived from its type locality, Shou Man village.

Variation. Length: 8.1–9.4 mm, length of elytra: 5.8–6.2 mm, width: 4.8–5.1 mm.

Distribution. See map ( Fig. 127 ) and Table 1.

Figures

FIGURE 73. A–D: Maladera shoumanensis Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. jatuai Ahrens, Fabrizi & Liu, sp. n. (holotype). A, E: aedeagus, left side lateral view; C, G: aedeagus, right side lateral view; B, F: parameres, dorsal view; D, H: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 127. Distribution of the Maladera shenglongi group: Maladera hui sp. n., M. jatuai sp. n., M. maoershana sp. n., M. shenglongi sp. n., M. shoumanensis sp. n., M. xingkeyangi sp. n., M. zhejiangensis sp. n..