Maladera bubengensis 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 : 244-246

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

Figures 57 A–D, 118

Type material examined. Holotype: ♂ “[ China] Bubeng, Xishuangbanna , Yunnan, 14.IX. 1993, 700m, leg. Yang Longlong ” ( IZAS).

Description. Length: 10.4 mm, length of elytra: 7.4 mm, width: 5.1 mm. Body oval, dark brown, antenna yellow, labroclypeus shiny, remainder of dorsal surface dull with some iridescent greenish sine, glabrous except a few short setae on head.

Labroclypeus subtrapezoidal, widest at base, lateral margins straight and convergent to strongly rounded anterior angles, lateral margin and ocular canthus producing a distinct blunt angle, margins moderately reflexed; anteriorly margin straight; surface moderately convex medially, shiny, finely densely punctate, with a few single setae; frontoclypeal suture not impressed and weakly angled medially; smooth area in front of eye approximately as wide as long; ocular canthus short and wide, impunctate, without terminal seta. Frons dull with iridescent shine, with fine, dense punctures, glabrous except for a few setae beside eyes. Eyes small, ratio of diameter/interocular width: 0.56. Antenna with 10 antennomeres; club with three antennomeres, slightly longer than remaining antennomeres combined. Mentum anteriorly elevated and flattened.

Pronotum subtrapezoidal, widest at base, lateral margins moderately convex and convergent anteriorly, anterior angles produced and sharp; anterior margin convex, marginal line complete; surface finely and densely punctate, with very minute setae in the punctures only; anterior and lateral margins sparsely setose; hypomeron carinate. Scutellum wide, triangular, with fine and dense punctures each bearing a minute seta.

Elytra oblong, widest at middle, striae weakly impressed, finely and densely punctate, intervals almost flat, with fine, dense punctures, with a few fine, erect, short setae, punctures with minute setae; epipleural margin robust, ending before strongly rounded external apical angle of elytra, epipleura sparsely setose, apical border membraneous, with a fine rim of short microtrichomes.

Ventral surface dull, metasternum and metacoxa with large and dense punctures, sparsely setose, metacoxa glabrous except for a several long setae laterally. Abdominal sternites, in addition to generally distributed fine and moderately dense punctures, each with a distinct transverse row of coarse punctures each bearing a short and robust seta, punctures with microscopic setae. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.81. Pygidium weakly convex, finely and densely punctate, without smooth midline, punctures with microscopic setae, long setae along apical margin lacking.

Legs short and wide; femora with two longitudinal rows of setae, finely and moderately densely punctate; metafemur dull, anterior margin acute, lacking an adjacent serrated line, anterior longitudinal row of setae absent, posterior ventral margin strongly widened in apical half and not serrate, glabrous; posterior dorsal margin smooth, with a few fine setae. Metatibia moderately wide and long, widest at middle, ratio width/length: 1/2.2, dorsal margin sharply carinate, with two groups of spines, basal one at middle, apical one at four fifths of metatibial length, without a contiguous serrated line basally; lateral face longitudinally convex, without punctures; ventral margin serrate, with four equidistant spines; medial face impunctate, apex interiorly near tarsal articulation shallowly concave. Tarsomeres impunctate dorsally, with a few short setae ventrally; metatarsomeres ventrally with a strongly serrated ridge, and with a further subventral longitudinal carina; first metatarsomere slightly longer than dorsal tibial spur, subsequent metatarsomeres of holotype missing.

Aedeagus: Fig. 57 A–C. Habitus: Fig. 57D . Female unknown.

Diagnosis. Maladera bubengensis Ahrens, Fabrizi & Liu , sp. n. differs from all other larger Chinese Maladera species in having symmetrical parameres that have asymmetrically distributed small teeth along the internal margins of both parameres.

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

Distribution. See map ( Fig. 118 ) and Table 1.

Figures

FIGURE 57. A–D: Maladera bubengensis Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. rubriventris Ahrens, Fabrizi & Liu, sp. n. (holotype); I–L: M. wulaoshanicaAhrens, 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 118. Distribution of the Maladera ferruginea group: Maladera bawanglingensis sp. n., M. beibengensis sp. n., M. bubengensis sp. n., M. jiangi sp. n., M. pui sp. n..