Maladera nanlingensis 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 : 333-334

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

Figures 79 I–L, 129

Type material examined. Holotype: ♂ “ China: Guangdong prov. Nanling National Nature Reserve Dadongshan, 18.-21.iv.2013 (border of mixed forest, at light) 24°56.0’N, 112°42.9’E, 690 m J. Hájek & J. Růžicka / 1077 Sericini Asia spec.” ( NMPC) . Paratype: 1 ♀ “ China: Guangdong prov. Nanling National Nature Reserve Dadongshan, 18.- 21.iv.2013 (border of mixed forest, at light) 24°56.0’N, 112°42.9’E, 690 m J. Hájek & J. Růžicka ” ( ZFMK) .

Description. Length: 7.8 mm, length of elytra: 5.6 mm, width: 4.6 mm. Body oblong, dark brown, antenna yellowish, surface dull, labroclypeus and anterior frons narrowly shiny, except a few long setae on head, glabrous.

Labroclypeus wide and trapezoidal, widest at base, lateral margins straight and strongly convergent anteriorly, anterior angles moderately rounded; anterior margin weakly emarginate medially; margins moderately reflexed; lateral margin and ocular canthus produce an indistinct angle; surface flat, very coarsely, densely punctate, with numerous erect setae; frontoclypeal suture finely incised, angled medially; smooth area anterior to eye convex, 2.5 times as wide as long; ocular canthus short and narrow (1/3 of ocular diameter), finely densely punctate, with a long terminal seta. Frons in posterior part dull, anteriorly tomentum lacking and shiny, with coarse, moderately dense, irregular, punctures, with a few single setae beside eyes and along a transversal line on disc. Eyes moderately large, ratio diameter/ interocular width: 0.61. Antenna with ten antennomeres; club with three antennomeres and straight, slightly shorter than remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

Pronotum moderately wide, widest at base, lateral margins in evenly convex, moderately convergent anteriorly and posteriorly, anterior angles moderately produced and slightly rounded at tip, posterior angles blunt; anterior margin weakly convex, marginal line absent, base without marginal line; surface finely and densely punctate, with minute setae in punctures; anterior and lateral margin robustly setose; hypomeron carinate, not produced ventrally. Scutellum wide, triangular, with fine and dense punctures.

Elytra oblong, widest at posterior third, striae finely impressed, finely and densely punctate, intervals weakly convex, with fine, moderately dense punctures, odd intervals with a few single short, erect setae, otherwise with minute setae in punctures; epipleural margin robust, ending at convex external apical angle of elytra, epipleura sparsely setose; apical border of elytra membraneous, with a fine rim of microtrichomes (visible at ca 100x magnification).

Ventral surface dull, finely and densely punctate, with dense and fine, adpressed setae, metasternal disc sparsely covered with longer setae; metacoxa with a few longer setae laterally. Abdominal sternites finely and densely punctate, glabrous, each sternite with a transverse row of punctures each bearing a fine seta. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.42. Pygidium moderately convex, dull, finely and densely punctate, without smooth midline, with short setae throughout and a few long setae along apical margin.

Legs long and moderately wide; femora shiny, with two longitudinal rows of setae, finely and sparsely punctate. Anterior margin of metafemur acute, without adjacent serrated line; posterior ventral margin smooth, not widened at apex, dorsal posterior margin smooth, neither serrate, glabrous. Metatibia long and moderately wide, widest at middle, ratio of width/length: 1/3.6, weakly carinate dorsally, with two groups of spines, basal group at one third, apical group at three quarters of metatibial length, in basal half a few short single spines; lateral face longitudinally convex, finely sparsely punctate on sides, with a few minute setae in punctures; ventral margin finely serrate, with five robust equidistant setae; medial face smooth and glabrous; apex finely serrate, shallowly emarginate interiorly near tarsal articulation. Tarsomeres dorsally impunctate, glabrous, neither laterally nor dorsally carinate, moderately setose ventrally; metatarsomeres glabrous and with a strongly serrated ridge ventrally and a smooth subventral longitudinal carina; first metatarsomere as long as following two tarsomeres combined and distinctly longer than dorsal tibial spur. Protibia moderately long, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 79 I–K. Habitus: Fig. 79L .

Diagnosis. This new species resembles somewhat members of the subgenus Maladera ; however, the parameres are sysmmetrical and the anterior serrated line of the metafemur is absent.

Etymology. The name of the new species is derived from its occurrence in the Nanling National Nature Reserve (adjective in the nominative singular).

Variation. Length: 7.6–7.8 mm, length of elytra: 5.5–5.6 mm, width: 4.4–4.6 mm. Female: Pygidium flat, antennal club as long as in male; Eyes slightly smaller than in male, ratio diameter/ interocular width: 0.53.

Distribution. See map ( Fig. 129 ) and Table 1.

Figures

FIGURE 79. A–D: Maladera wandingana Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. trifidiforceps Ahrens, Fabrizi & Liu, sp. n. (holotype); I–L: M. nanlingensis 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 129. Distribution of Maladera species with uncertain systematic status: Maladera baishaoensis sp. n., M. hutiaoensis sp. n., M. jinggangshanica sp. n., M. lukjanovitschi (Medvedev, 1966), M. luoxiangensis sp. n., M. nabanensis sp. n., M. nanlingensis sp. n..