Maladera kreyenbergi
Creators: name: Fabrizi, Silvia
name: Liu, Wan-Gang
name: Bai, Ming
name: Yang, Xing-Ke
name: Ahrens, Dirk
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Melolonthidae
Maladera
Maladera kreyenbergi

description: Maladera kreyenbergi (Moser, 1918)
Figures 75 A–D, 128
Autoserica kreyenbergi Moser, 1918: 211.
Maladera kreyenbergi: Nomura 1974: 108; Ahrens 2002: 87; 2006b: 237, 2007b: 23.
Type material examined. Lectoype (here designated): ♂ “ Pingshiang Süd-China Dr. Kreyenberg / Autoserica kreyenbergi Type Mos./ kreyenbergi Mos. ” (ZMHB).
Additional material examined. 2 ex. “ China: Fujian Province: Mt. Liang-shan-ding, Wuping county, July 2-13 2009 local collectors Ankauf via Li Jingke 2010” (ZFMK), 1 ♂ “ CH-Guizhou NE 27.V.-3.VI. 20km NW of Jiangkou, 1995 Fanjing Shan-Kuaichang E. Jendek & O. Šauša leg./ Coll. P. Pacholatko Invt. No. / CS47/ 570 Sericini Asia spec.” (CP), 1 ♂ “ Mt. Tianpingshan, Sangzhi, Hunan, 13.VIII.1988, 1640mŊ (IZAS), 2 ♂♂ “ Longmenhe, Xingshan, Hubei, 20,21. VI.1993, 1350m, leg. Li Wenzhu ” (IZAS), 1 ♂ “ S.W.part of Hunan prov. China / L.R. Thompson Collr 1919” (USNM).
Redescription. Length: 8.2 mm, length of elytra: 6.5 mm, width: 5.0 mm. Body oblong-oval, dark reddish brown, antenna yellow, shiny, labroclypeus shiny, dorsal face nearly glabrous.
Labroclypeus wide and subtrapezoidal, widest at base, lateral margins weakly convex and strongly convergent anteriorly, anterior angles moderately rounded, anterior margin weakly emarginate, margins weakly reflexed; lateral margin and ocular canthus produce an indistinct angle; surface weakly convex medially, finely, densely punctate, glabrous; frontoclypeal suture indistinctly incised, weakly curved; smooth area anterior to eye convex, twice as wide as long; ocular canthus short and narrow (1/4 of ocular diameter), finely densely punctate, without terminal seta. Frons with dense and fine punctures, with a few single setae beside eyes. Eyes moderately large, ratio diameter/ interocular width: 0.64. Antenna with ten antennomeres, club composed of three antennomeres and straight, as long as remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.
Pronotum transverse, widest shortly before base, lateral margins evenly convex and convergent anteriorly, anterior angles distinctly produced and sharp, posterior angles blunt; anterior margin straight, with fine, rather indistinct marginal line, base without marginal line; surface finely and densely punctate, with minute setae in punctures being as long as puncture diameter, otherwise glabrous; anterior and lateral margin sparsely setose; hypomeron carinate, not produced ventrally. Scutellum wide, triangular, with fine, dense punctures.
Elytra widest at posterior third, striae finely impressed, finely and densely punctate, intervals moderately convex, with fine, moderately dense punctures concentrated along striae and with minute setae in punctures, penultimate interval with a few single erect 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 shiny, finely and densely punctate, metasternum including disc sparsely 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 moderately convex, dull, finely and densely punctate, without smooth midline, with numerous long setae on apical half.
Legs moderately long and wide, shiny; femora with two longitudinal rows of setae, finely and sparsely punctate. Metafemur in widest part shiny, anterior margin acute, without adjacent continuous serrated line, anterior row of setae complete; posterior ventral margin smooth, weakly widened at ventral apex, dorsal posterior margin smooth, neither serrate, with a few single long setae. Metatibia short and moderately wide, widest at middle, ratio of width/length: 1/3.0, sharply carinate dorsally, with two groups of spines, basal group at one third, apical group at two thirds of metatibial length, in basal half with a few fine single setae and a serrate line beside dorsal margin over basal third; lateral face longitudinally convex, except a few sparse punctures on base smooth and glabrous; ventral margin finely serrate, with three equidistant robust setae; medial face smooth and glabrous; apex finely serrate, concavely 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, glabrous; first metatarsomere little shorter than following two tarsomeres combined and slightly longer than dorsal tibial spur. Protibia short, tridentate, basal tooth blunt and indistinct; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.
Aedeagus: Fig. 75 A–C. Habitus: Fig. 75D.
Distribution. See map (Fig. 128) and Table 1.
description: Published as part of 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), pp. 1-400 in Zootaxa 4922 (1) on pages 316-318, DOI: 10.11646/zootaxa.4922.1.1, http://zenodo.org/record/4496316