Maladera xingkeyangi 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 : 304-305

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

Figures 71 E–H, 127

Type material examined. Holotype: ♂ “ China, E Fujian, 1. V. Shiniushan, 1600-1700m 25°38’N 118°28’E Jaroslav Turna leg., 2008/ 806 Sericini : Asia spec.” ( ZFMK).

Description. Length: 8.7 mm, Length: of elytra 6.6 mm, width: 4.9 mm. Body oval, dark reddish brown, antenna yellowish, labroclypeus shiny, remainder of dorsal surface dull, glabrous except a few long setae on head, pronotum and elytra.

Labroclypeus subtrapezoidal, little wider than long, widest at base, lateral margins convex and strongly convergent to rounded anterior angles, before angles slightly incised, lateral margin and ocular canthus producing a blunt angle, margins weakly reflexed; anterior margin moderately emarginate medially; surface flat, shiny, densely, finely and coarse punctate, with few long, erect setae anteriorly; frontoclypeal suture flat, finely incised and angled medially; smooth area in front of eye approximately twice as wide as long; ocular canthus short and wide, sparsely and finely punctate, with one terminal seta. Frons dull, anteriorly narrowly shiny, with fine, irregularly dense punctures, glabrous except for a few setae beside eyes and frontoclypeal suture. Eyes small, ratio of diameter/interocular width: 0.56. Antenna with 10 antennomeres; club with three antennomeres, straight, as long as remaining antennomeres combined. Mentum anteriorly elevated and flattened.

Pronotum subtrapezoidal, moderately wide, widest at base, lateral margins moderately convex and weakly convergent in basal half, in distal half stronger convergent, anterior angles produced and sharp, posterior angles blunt; anterior margin convex, marginal line widely interrupted medially; surface finely and densely punctate, with minute setae in punctures, with a very shallow longitudinal impression along midline; anterior and lateral margins sparsely setose, setae of anterior margin lacking in middle; hypomeron carinate. Scutellum wide, triangular, with fine and dense punctures, each bearing a minute seta, impunctate along middle.

Elytra oblong, widest at posterior third, striae weakly impressed, finely and densely punctate, intervals flat, with fine, dense punctures, on odd intervals with a few fine, erect, short setae, otherwise punctures with minute setae; epipleural margin robust, ending at the strongly rounded external apical angle of elytra, epipleura densely setose, apical border membraneous, with a 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, penultimate sternite apically with a shiny smooth chitinous border, which is one quarter as long as sternite. Mesosternum between mesocoxae narrower than mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.31. Pygidium moderately convex, with fine dense punctures and minute setae in punctures, along apical margin with a few long setae.

Legs moderately long and narrow; femora with two longitudinal rows of setae, finely and moderately densely punctate. Metafemur shiny, partly dull, anterior margin acute, lacking an adjacent serrated line, posterior ventral margin medially straight, weakly widened in apical half and not serrate, dorsally not serrated, finely setose. Metatibia moderately wide and long, widest at apex, ratio width/length: 1/3.9, dorsally longitudinally convex, with two groups of spines, basal one at one third, apical one at three quarter of metatibial length, with a few fine spines basally; lateral face longitudinally convex, with sparse and fine punctures particularly on basal half, with minute setae in punctures; ventral margin serrate, with three equidistant spines; medial face impunctate, apex interiorly near tarsal articulation shallowly concave. Tarsomeres impunctate dorsally, ventrally with sparse, short setae; metatarsomeres ventrally glabrous, with a strongly serrated ridge and smooth subventral longitudinal carina; first metatarsomere distinctly shorter than following two tarsomeres combined and little longer than dorsal tibial spur. Protibia short, bidentate. All claws symmetrical, feebly curved and long, with normally developed basal tooth.

Aedeagus: Fig. 71 E–G. Habitus: Fig. 71H . Female unknown.

Diagnosis. Maladera xingkeyangi Ahrens, Fabrizi & Liu , sp. n. is very similar to M. shenglongi in external appearance and genital morphology. However, in M. xingkeyangi the right paramere is wider, with the dorsal lobe reduced, and the left paramere has only one short distal process, instead of two.

Etymology. The new species is dedicated to Prof. Xingke Yang (Bejing) (noun in the genitive singular case).

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

Figures

FIGURE 71. A–D: Maladera shenglongi Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. xingkeyangi Ahrens, Fabrizi & Liu, sp. n. (holotype); I–N: M. maoershana Ahrens, Fabrizi & Liu, sp. n. (holotype). A, E, I: aedeagus, left side lateral view; C, G, M: aedeagus, right side lateral view; B, F, J: parameres, dorsal view; K: phallobase, dorsal view; L: phallobase, ventral view; D, H, N: 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..