Maladera tiammushanica 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 : 256-258

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

Figures 60 A–D, 124

Type material examined. Holotype: ♂ “ China (Zhejiang) Tiammu Shan , pass 25km NNW Linan, 620-820m 30°25’40’’N / 119°35’30’’E (creek valley, bamboo, mixed forest, beaten from vegetation) 16.VI.2007 D.W. Wrase [37A]/ 767 Sericini Asia spec.” ( ZFMK) . Paratypes: 2 ♂♂ “[ China] Wenquan, Mt. Huangshan , Anhui, 24.VII.1977, leg. Li Fasheng ” ( CAU, ZFMK) , 1 ♂ “[ China] Mt. Longwangshan, Anji , Zhejiang, 13.VI. 1996, 490m, leg. Li Wenzhu” ( IZAS) , 1 ♂ “[ China] Mt. Longwangshan, Anji , Zhejiang, 14.VI. 1996, 500m, leg. Yang Xingke ” ( IZAS) .

Description. Length: 9.7 mm, length of elytra: 7.0 mm, width: 5.8 mm. Body oval, dark reddish brown, antenna yellow, labroclypeus weakly shiny, remainder of dorsal surface dull, glabrous.

Labroclypeus subtrapezoidal, distinctly wider than long, widest at base, lateral margins straight and moderately convergent to moderately rounded anterior angles, lateral margin and ocular canthus producing an indistinct angle, margins weakly reflexed; anterior margin weakly emarginate medially; surface convexly arched, coarsely densely punctate, with a few long, erect setae anteriorly; frontoclypeal suture weakly impressed and angled medially; smooth area in front of eye approximately three times as wide as long; ocular canthus short and robust, finely punctate, with a terminal seta. Frons with fine, irregular, sparse punctures, glabrous except for a few setae beside eyes and behind frontoclypeal suture. Eyes small, ratio of diameter/interocular width: 0.53. Antenna composed of 10 antennomeres, club with 3 antennomeres, straight, 1.2 times as long as remaining antennomeres combined. Mentum anteriorly elevated and flattened.

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

Elytra oblong, widest at posterior third, striae distinctly impressed, finely and densely punctate, intervals weakly elevated, with fine, moderately dense punctures concentrated along striae, punctures with minute setae; epipleural margin robust, ending at strongly rounded external apical angle of elytra, epipleura sparsely setose, apical border membraneous, with a rim of very 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 short chitinous border. Mesosternum between mesocoxae narrower than mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.46. Pygidium strongly convex, dull, with coarse, moderately dense punctures and 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, not widened in apical half, entirely serrate, dorsal margin also serrate, finely setose. Metatibia moderately wide and long, widest at apex, ratio width/length: 1/3.4, dorsally sharply carinate, with two groups of spines, basal one at middle, apical one at four fifths of metatibial length, in basal half with a few punctures, and short spines; lateral face longitudinally convex, with moderately dense and fine longitudinally impressed punctures; ventral margin serrate, with two widely distant spines; medial face finely sparsely punctate, apex interiorly near tarsal articulation shallowly concave. Tarsomeres impunctate dorsally, ventrally with sparse, short setae; metatarsomeres ventrally glabrous, with a strongly serrated ridge and a smooth subventral longitudinal carina; first metatarsomere slightly shorter than following two tarsomere combined and distinctly longer than dorsal tibial spur. Protibia short, bidentate. All claws symmetrical, feebly curved and long, with normally developed basal tooth.

Aedeagus: Fig. 60 A–C. Habitus: Fig. 60D . Female unknown.

Diagnosis. Maladera tiammushanica Ahrens, Fabrizi & Liu , sp. n. differs from M. uncipenis Ahrens, Fabrizi & Liu , sp. n. in lacking punctation on the tarsomeres and having the apex of phallobase laterally produced.

Etymology. The name of the new species is derived from the type locality, Tiammu Shan (adjective in the nominative singular).

Variation. Length: 8.4–9.7 mm, length of elytra: 6.2–7.0 mm, width: 5.2–5.8 mm.

Distribution. See map ( Fig. 124 ) and Table 1.

Figures

FIGURE 60. A–D: Maladera tiammushanicaAhrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. putaodiensis Ahrens, Fabrizi & Liu, sp. n. (holotype); I–L: M. excisilabrata 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 124. Distribution of the Maladera uncipenis group: Maladera tiammushanica sp. n., M. tianzushanica sp. n., M. uncipenis sp. n., M. xinqiaoensis sp. n..