Maladera hunuguensis 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 : 213-214

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

Figures 48 I–L, 113

Type material examined. Holotype: ♂ “[ China] Baimianshan Yanling, F -Hunugu, I. X.2003, leg. Li et al. / 869 Sericini Asia spec.” ( ZFMK) . Paratypes: 3 ♂♂, 1 ♀ “ China-Guangdong, Daqiao env., 1000-1200m, 24°54’N - 113°01’E, 1.-3.v.2002, Dr. R. Fencl lgt./ 829 Sericini : Asia spec.” ( CP, ZFMK) , 2 ♂♂ “ 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: 9.7 mm, length of elytra: 7.2 mm, width: 6.0 mm. Body wide-oval, reddish brown, antenna yellowish brown, dorsal surface dull, labroclypeus, tarsomeres, and tibiae shiny, glabrous.

Labroclypeus wide, lateral margins weakly convex and moderately convergent, lateral margins produce with ocular canthus an indistinct angle, anterior angles convex, anterior margin shallowly emarginate medially, margins weakly reflexed; surface shiny, flat, finely and densely punctate, distance between punctures smaller their diameter, with a few long, erect setae; smooth area in front of eyes 2.5 times as wide as long; frontoclypeal suture finely incised, bluntly angled medially; ocular canthus moderately wide and short (1/3 of ocular diameter), finely and densely punctate, short terminal seta absent. Eyes moderately large, ratio diameter/ interocular width: 0.6. Frons with fine and moderately dense punctures, with a few single setae beside eyes. Antenna with ten antennomeres, club with three antennomeres and straight, 1.3 times as long as remaining antennomeres combined. Mentum convexly elevated and flattened anteriorly.

Pronotum widest at base, lateral margins evenly convex and convergent anteriorly, anterior angles sharp and distinctly produced; anterior margin convex, with complete but fine marginal line; basal margin without marginal line; surface finely and densely punctate, punctures with microscopic setae only, setae of lateral and anterior margin sparse. Hypomeron carinate, strongly produced ventrally. Scutellum wide, triangular, punctation as in pronotum.

Elytra convex, widest at posterior third, striae finely impressed, finely punctate, intervals weakly convex, finely and densely punctate, punctures concentrated along striae, with minute setae in punctures, odd intervals with a few erect short setae; epipleura ending at strongly rounded external apical angle of elytra, sparsely setose; apex of elytra with a fine membraneous rim of short microtrichomes.

Ventral face coarsely and densely punctate, mesosternum densely shortly setose, only metasternal plate with numerous robust setae; metacoxa glabrous, with a few long setae laterally. Distance between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.62. Abdominal sternites finely and moderately densely punctate, each with a row of coarse punctures bearing each a robust seta; fourth sternite at apex widely transversely elevated. Pygidium dull, moderately convex, coarsely and densely punctate, on apex with a few long setae.

Legs moderately long and wide; femora superficially and sparsely punctate, with two longitudinal rows of setae. Metafemur shiny, anterior margin acute, without adjacent serrated line, anterior longitudinal row of setae absent; posterior ventral margin almost straight, not widened in apical half, neither ventrally nor dorsally serrated but smooth, glabrous. Metatibia moderately long and wide, widest shortly before apex, dorsal and ventral margin subparallel, ratio width/length: 1/3.2, sharply carinate dorsally, with two groups of spines, basal one at middle, apical one at four fifths of metatibial length, basally with a few robust and short setae; lateral face weakly longitudinally convex, with fine sparse punctures; medial face impunctate, apex shallowly and concavely emarginate interiorly near tarsal articulation. Tarsomeres impunctate dorsally, with dense, fine setae ventrally; metatarsomeres ventrally glabrous, with a strongly serrated carina, subventrally with a second, smooth longitudinal carina; first metatarsomere as long as following two tarsomeres combined, little longer than dorsal tibial spur. Protibia short, bidentate. Anterior claws symmetrical.

Aedeagus: Fig. 48 I–K. Habitus: Fig. 48L .

Diagnosis. Maladera hunuguensis Ahrens, Fabrizi & Liu , sp. n. differs from M. gibbiventris ( Brenske, 1897) in the parameres each possessing a small lateral tooth, shortly before the apex on the left paramere and shortly before the middle on the right.

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

Variation. Length: 9.7–11.2 mm, length of elytra: 7.1–7.8 mm, width: 6.0– 6.8 mm. Female: eyes smaller than in male, ratio of diameter/interocular width: 0.44; antennal club with three antennomeres, as long as remaining antennomeres combined; pygidium flat.

Distribution. See map ( Fig. 113 ) and Table 1.

Figures

FIGURE 48. A–D: Maladera kryschanowskii Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. gibbiventris (Brenske, 1897) (China: Guizhou: Shibing); I–L: M. hunuguensis Ahrens, Fabrizi & Liu, sp. n. (holotype). A, E, I: aedeagus, left side lateral view; C, G, K: aedeagus, right side lateral view; B, F, B: parameres, dorsal view; D, H, L: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 113. Distribution of the Maladera gibbiventris group: Maladera gibbiventris (Brenske, 1897) and M. hunuguensis sp. n..