Maladera maguanensis 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 : 180-181

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

Figures 40 E–H, 109

Type material examined. Holotype: ♂ “ China, Yunnan 1300-1600m Maguan Businsky lgt/ Coll. P. Pacholatko Invt. No. / 759 Sericini Asia spec.” ( CP).

Description. Length: 12.4 mm, length of elytra: 8.3 mm, width: 7.3 mm. Body wide, oval, blackish brown, antenna yellowish brown, dorsal surface dull, labroclypeus, tarsomeres, and tibiae shiny, glabrous.

Labroclypeus wide, lateral margins strongly convex and convergent, lateral margins produce with ocular canthus an indistinct angle, anterior angles strongly convex, anterior margin shallowly emarginate medially, margins weakly reflexed; surface shiny, at base narrowly dull, weakly convex medially, finely and densely punctate, distance between punctures partly smaller their diameter, with a few single setae anteriorly; frontoclypeal suture finely incised, bluntly angled medially; ocular canthus moderately wide and long (1/3 of ocular diameter), finely and densely punctate, with a short terminal seta. Eyes moderately large, ratio diameter/ interocular width: 0.55. Frons with fine and moderately dense punctures, with a few single setae beside eyes. Antenna with ten antennomeres, club with three antennomeres and straight, 1.2 times as long as remaining antennomeres combined. Mentum convexly elevated and flattened anteriorly.

Pronotum strongly convex, widest at base, lateral margins evenly convex and convergent anteriorly, anterior angles sharp and distinctly produced; anterior margin with a fine complete marginal line, weakly convexly produced medially; basal margin without marginal line; surface finely and very densely punctate, many punctures longitudinally impressed, setae of lateral and anterior margin robust but sparse, punctures with microscopic setae only; hypomeron carinate. Scutellum wide, triangular, punctation as in pronotum, on basal midline impunctate.

Elytra strongly convex, widest shortly behind middle, striae finely impressed, finely punctate, intervals flat, very finely and densely punctate, with minute setae in punctures; 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, 1.5 times as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.82. Abdominal sternites finely and moderately densely punctate, each with a row of coarse punctures bearing each a robust seta, penultimate sternite transversely elevate at apex. Pygidium moderately convex, coarsely and densely punctate, on lateral and apical margins long setae missing.

Legs wide and short; 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 reduced; posterior ventral margin almost straight, weakly widened in apical half, neither ventrally nor dorsally serrated but smooth, glabrous. Metatibia very short and wide, flattened, ratio width/length: 1/2.4 sharply carinate dorsally, with three groups of spines, basal one at one third, median one shortly behind middle, and apical one at three quarters of metatibial length, basally with a few fine and short setae; lateral face weakly longitudinally convex, completely smooth along middle, dorsally and ventrally with a few superficial large punctures; medial face impunctate, apex shallowly and concavely emarginate interiorly near tarsal articulation. Tarsomeres impunctate dorsally, with dense, fine setae ventrally; metatarsomeres ventrally glabrous, with a strongly serrated carina, subventrally with a second, smooth longitudinal carina, first metatarsomere little shorter than following two tarsomeres combined, as long as dorsal tibial spur. Protibia short, bidentate. Anterior claws symmetrical.

Aedeagus: Fig. 40 E–G. Habitus: Fig. 40H . Female unknown.

Diagnosis. Maladera maguanensis Ahrens, Fabrizi & Liu , sp. n. differs from M. lushanensis Ahrens, Fabrizi & Liu , sp. n. in having the parameres slightly longer and the apex of the phallobase flat dorsally; as in M. siniaevi and M. tumida Ahrens, 2004 , the left paramere has a lateral carina.

Etymology. The new species is named after the type locality, Maguan (adjective in the nominative singular).

Distribution. See map ( Fig. 109 ) and Table 1.

Figures

FIGURE 40. A–D: Maladera lushanensis Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. maguanensis Ahrens, Fabrizi & Liu, sp. n. (holotype); I–L: M. mupingensis Ahrens, Fabrizi & Liu, sp. n. (holotype). A, E, I: aedeagus, left side lateral view; C, G, K: aedeagus, right side lateral view; B, F, J: parameres, dorsal view; D, H, L: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 109. Distribution of the Maladera granuligera group: Maladera maguanensis sp. n., M. mupingensis sp. n., M. shiruguanensis sp. n., M. siniaevi Ahrens, 2004.