Maladera diaolinensis 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 : 117-119

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

Figures 25 A–D, 97

Type material examined. Holotype: ♂ “ China, W Yunnan Diaolin , 18.VI.1993 E. Jendek & O. Šauša leg./ 319 Sericini Asia spec.” ( CP) (head of holotype specimen missing).

Description. Length: n/a, length of elytra: 6.2 mm, width: 5.1 mm. Body oblong-oval, dark reddish brown, antenna yellow, dull, elytra and labroclypeus iridescent and shiny, dorsal face nearly glabrous; head in holotype missing.

Pronotum transverse, widest in posterior third, lateral margins evenly convex and weakly convergent anteriorly and posteriorly, anterior angles distinctly produced and sharp, posterior angles moderately rounded; anterior margin convex, with fine marginal line, base without marginal line; surface finely and densely punctate, with minute setae in punctures being as long as puncture diameter, otherwise glabrous; lateral margin densely setose; hypomeron carinate, not produced ventrally. Scutellum wide, triangular, with fine, dense punctures.

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

Ventral surface dull, coarsely and densely punctate, metasternum including disc densely setose; metacoxa glabrous, with a few longer setae laterally. Abdominal sternites finely and densely punctate, punctures with minute setae, 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: 1/1.4. Pygidium dull, moderately convex, finely and densely punctate, with short smooth midline, with numerous long and short, fine setae in apical half.

Legs moderately long and narrow, shiny; femora with two longitudinal rows of setae, coarsely and moderately densely punctate. Anterior margin of metafemur acute, with adjacent continuous serrated line, anterior row of setae complete; posterior ventral margin smooth, weakly widened at ventral apex, dorsal posterior margin smooth, neither serrate, glabrous. Metatibia long and wide, widest at apex, ratio of width/length: 1/3.4, moderately carinate dorsally, with two groups of spines, basal group shortly behind the middle, apical group at four fifths of metatibial length, in basal half with a few short and fine single setae and a continuous serrated line beside entire dorsal margin until the basal group of spines; lateral face longitudinally convex, with sparse fine punctures in basal half, minutely setose; ventral margin finely serrate, with five equidistant robust 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 with a strongly serrated ridge ventrally and a smooth subventral longitudinal carina; first metatarsomere distinctly longer than following tarsomere and slightly longer than dorsal tibial spur. Protibia moderately long, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 25 A–C. Habitus: Fig. 25D . Female unknown.

Diagnosis. Maladera diaolinensis Ahrens, Fabrizi & Liu , sp. n. differs from M. tiani Ahrens, Fabrizi & Liu , sp. n. in having the fused left and right parameres straight and bearing blunt lateral teeth at middle on each side and the basal group of metatibial setae of is situated shortly behind the middle.

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

Distribution. See map ( Fig. 97 ) and Table 1.

Figures

FIGURE 25.A–D: Maladera diaolinensis Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. yipinglangensis Ahrens, Fabrizi & Liu, sp. n. (holotype); I–L: M. yakouensis 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 97. Distribution of the Maladera egregia group: Maladera diaolinensis sp. n., M. egregia (Arrow, 1946), M. gusakovi sp. n., M. hmong Ahrens, 2004, M. hubeiensis sp. n., M. laocaiensis sp. n., M. levis (Frey, 1972).