Maladera beidouensis 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 : 279-280

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

Figures 65 I–L, 121

Type material examined. Holotype: ♂ “[ China] Beidou, Napo , Guangxi, 22.VI. 2000, 550m, leg. Chen Jun ” ( IZAS).

Description. Length: 9.9 mm, length of elytra: 7.2 mm, width: 5.7 mm. Body oblong-oval, dark brown, antenna yellow, labroclypeus weakly shiny, remainder of dorsal surface dull, glabrous.

Labroclypeus narrowly subtrapezoidal, wider than long, widest at base, lateral margins slightly convex and weakly convergent to convex anterior angles, lateral margin and ocular canthus producing a distinct angle, margins weakly reflexed; anterior margin distinctly emarginate medially; surface flat, finely densely punctate, with a few long, erect setae anteriorly; frontoclypeal suture weakly impressed and angled medially; smooth area in front of eye approximately 1.5 times as wide as long; ocular canthus long and narrow, finely punctate, with one or two terminal setae. Frons with fine, moderately dense punctures, glabrous except for a few setae beside eyes frontoclypeal suture. Eyes moderately large, ratio of diameter/interocular width: 0.54. Antenna composed of 10 antennomeres, club with 3 antennomeres, straight, 1.3 times as long as remaining antennomeres combined. Mentum anteriorly elevated and flattened.

Pronotum trapezoidal, widest at base, lateral margins weakly evenly convex and convergent anteriorly; anterior angles produced and sharp, posterior angles blunt; anterior margin convex, marginal line complete but fine; 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 middle, striae distinctly impressed, finely and densely punctate, intervals convex, 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 fine 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. Distance between mesocoxae little smaller than width of mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.7. Pygidium strongly convex, dull, with fine, dense punctures, with numerous 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 and anterior longitudinal row of setae; posterior ventral margin straight, not widened in apical half, apically serrate, dorsal margin also serrate, finely setose. Metatibia moderately wide and long, widest at apex, ratio width/length: 1/3.45, dorsally sharply carinate, with two groups of spines, basal one shortly before middle, apical one at four fifths of metatibial length, in basal half with a few punctures, and short spines; lateral face longitudinally convex, with dense and coarse, longitudinally impressed punctures; ventral margin serrate, with two widely distant spines; medial face finely sparsely punctate, apex interiorly near tarsal articulation shallowly concave. Tarsomeres dorsally with dense elongate punctures, ventrally with sparse, short setae; metatarsomeres ventrally glabrous, with a strongly serrated ridge and a smooth subventral longitudinal carina; first metatarsomere as long as following two tarsomeres 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. 65 I–K. Habitus: Fig. 65L . Female unknown.

Diagnosis. This new species differs from M. thianzhoushanica Ahrens, Fabrizi & Liu , sp. n. in having a large basal ventral lobe on the nearly straight left paramere, as well as a shorter antennal club.

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

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

Figures

FIGURE 65. A–D: Maladera constellata Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. bawanglingana Ahrens, Fabrizi & Liu, sp. n. (holotype); I–L: M. beidouensis 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..