Maladera maoershana 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 : 305-306

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

Figures 71 I–N, 127

Type material examined. Holotype: ♂ “ China, NE Guangxi, 5-19.VI. Mao Ershan , 1500-1600m for. Park, 25°55’N 110°28’E Jaroslav Turna leg., 2011/ 1039 Sericini Asia spec.” ( ZFMK) . Paratypes: 1 ♂, 3 ♀♀ “ China, NE Guangxi, 5-19.VI. Mao Ershan , 1500-1600m for. Park, 25°55’N 110°28’E Jaroslav Turna leg., 2011” ( ZFMK) , 1 ♂ “[ China] Mt. Mao’ershan , Guangxi, 14.VII.1985, 1900m, leg. Liao Subai / LW-782” ( IZAS) , 1 ♂ “[ China] Mts. Maoershan , Guangxi, 15.VII.1985, 1100m, leg. Wang Ziqing / LW-177” ( IZAS) .

Description. Length: 8.4 mm, Length: of elytra 6.4 mm, width: 5.0 mm. Body oblong oval, dark brown, antenna yellowish, labroclypeus, anterior frons and pronotum 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 weakly convex and convergent to rounded anterior angles, lateral margin and ocular canthus producing a blunt angle, margins weakly reflexed; anterior margin moderately emarginate medially; surface flat, shiny, densely, finely punctate, with few long, erect setae anteriorly; frontoclypeal suture weakly elevated, 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 posteriorly dull, anteriorly shiny, with fine, irregularly dense punctures, with a few single setae beside eyes and numerous adpressed ones on posterior disc. Eyes small, ratio of diameter/interocular width: 0.55. Antenna with 10 antennomeres; club with three antennomeres, straight, 1.1 times as long as remaining antennomeres combined. Mentum anteriorly elevated and flattened.

Pronotum subtrapezoidal, moderately wide, widest at base, lateral margins moderately convex and evenly convergent anteriorly, 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, dull, 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, even intervals flat, with fine, dense punctures, odd intervals weakly convex, dense punctures concentrated along striae and 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, metasternal disc densely setose, metacoxa glabrous except for a several long setae laterally. Mesosternum between mesocoxae narrower than mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.27. 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. Pygidium moderately convex, with fine dense punctures and minute setae in punctures, on apical half 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: 1/4.0, dorsally longitudinally convex, with two groups of spines, basal one at middle, apical one at four fifths of metatibial length, with a few fine spines basally; lateral face longitudinally convex, with moderately dense and fine punctures, 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 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 I–M. Habitus: Fig. 71N .

Diagnosis. Maladera maoershana Ahrens, Fabrizi & Liu , sp. n. is very similar to M. xingkeyangi Ahrens, Fabrizi & Liu , sp. n. and M. shenglongi Ahrens, Fabrizi & Liu , sp. n. in external appearance. However, in M. maoershana , the left paramere is longer, while both lobes of the right paramere are well separated (compared to the other two species); furthermore, the phallobase has two ventral processes producing a central cavity.

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

Variation. Length: 8.4–9.2 mm, Length: of elytra 6.4–6.8 mm, width: 5.0– 5.1 mm. Female: eyes little smaller than in male, ratio of diameter/interocular width: 0.52; antennal club with three antennomeres, little shorter than remaining antennomeres combined; pygidium weakly convex.

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..