Maladera dayaoshanica 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 : 260-262

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

Figures 61 A–D, 121

Type material examined. Holotype: ♂ “[ China] Mt. Dayaoshan, Jinxiu , Guangxi, 15.VI.1982, leg. Li Fasheng / LW-934” ( CAU) . Paratype: 1 ♂ “[ China] Neicujiang, Longsheng , Guangxi, 6.VI. 1963, 840m, leg. Wang Shuyong / LW-735” ( IZAS) .

Description. Length: 8.3 mm, length of elytra: 6.4 mm, width: 4.5 mm. Body oval, dark yellowish brown and dull, head and pronotum slightly darker; antenna yellow, labroclypeus anteriorly shiny, with several short setae on the head and elytra.

Labroclypeus subtrapezoidal, widest at base, lateral margins weakly convex and moderately convergent to moderately rounded anterior angles, lateral margin and ocular canthus producing a blunt angle; margins weakly reflexed, anteriorly distinctly emarginate medially; surface transversely convex medially, shiny, coarsely and densely punctate, with few long, erect setae anteriorly; frontoclypeal suture weakly impressed and moderately curved; smooth area in front of eye approximately 2.5 times as wide as long; ocular canthus short and moderately wide, finely punctate, with one terminal seta. Frons dull, with fine, dense punctures, glabrous except a few setae beside eyes. Eyes moderately large, ratio of diameter/interocular width: 0.56. Antenna with 10 antennomeres; club with three antennomeres, as long as remaining antennomeres combined. Mentum anteriorly elevated and flattened.

Pronotum narrowly subtrapezoidal, widest at base, lateral margins nearly straight and moderately convergent anteriorly, in anterior quarter slightly convex; anterior angles weakly produced and slightly rounded at tip; posterior angles blunt; anterior margin moderately convexly produced medially, anterior marginal line widely interrupted medially; surface coarsely and densely punctate, with minute setae in punctures only, with two small and shallow impression at each side of midline; anterior and lateral margins sparsely setose. Scutellum wide, triangular, with fine and dense punctures, each bearing a minute seta, impunctate medially.

Elytra oblong, widest at middle, striae weakly impressed, finely and densely punctate, intervals weakly elevated, with fine, dense punctures concentrated along striae, odd intervals with a few fine, erect, short setae, otherwise punctures with minute setae only; 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. Mesosternum between mesocoxae narrower than mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.7. Abdominal sternites, in addition to fine and dense punctures, each with a distinct transverse row of punctures each bearing a short and fine seta, otherwise punctures with microscopic setae, penultimate sternite apically with a shiny smooth chitinous border, which is one third as long as sternite. Pygidium strongly convex, finely and densely punctate, without smooth midline, punctures with microscopic setae and with a few long setae on apical half.

Legs moderately wide and long; femora with two longitudinal rows of setae, finely and moderately densely punctate; metafemur dull, anterior margin acute, lacking an adjacent serrated line; posterior ventral margin straight, weakly widened in apical half and serrate, dorsal posterior margin completely serrated, finely sparsely setose. Metatibia moderately wide and long, widest at apex, ratio width/length: 1/3.62, dorsally sharply carinate, with only one group of spines (basal one reduced) at four fifth of metatibial length, with several single spines along dorsal margin basally; lateral face longitudinally convex, with dense and fine punctures and minute setae in punctures; ventral margin serrate, with two spines; medial face sparsely punctate; apex interiorly near tarsal articulation shallowly concave. Tarsomeres impunctate dorsally, ventrally with sparse, short setae; metatarsomeres glabrous ventrally and with a strongly serrated ridge, beside which is not a strong longitudinal carina; first metatarsomere shorter than following two tarsomeres combined and little longer than dorsal tibial spur. Protibia bidentate, moderately long. Protarsal claws symmetric.

Aedeagus: Fig. 61 A–C. Habitus: Fig. 61D . Female unknown.

Diagnosis. Maladera dayaoshanica Ahrens, Fabrizi & Liu , sp. n. differs from M. jaroslavi Ahrens, Fabrizi & Liu , sp. n. in the lateral phallobasal process being narrow and long and the left paramere being half as long as the right.

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

Variation. Length: 8.3–9.0 mm, length of elytra: 6.3–6.4 mm, width: 4.5–5.0 mm.

Distribution. See map ( Fig. 121 ) and Table 1.

Figures

FIGURE 61. A–D: Maladera dayaoshanica Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. shangraoensis Ahrens, Fabrizi & Liu, sp. n. (holotype); I–L: M. hunanensis 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 121. Distribution of the Maladera uncipenis group: Maladera baii sp. n., M. bawanglingana sp. n., M. beidouensis sp. n., M. chinensis (Moser, 1915), M. dadongshanica sp. n., M. dayaoshanica sp. n., M. emeifengensis sp. n., M. excisilabrata sp. n..