Maladera masumotoi Nomura, 1974

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 : 86-88

Maladera masumotoi Nomura, 1974

Figures 18 A–E, 92

Maladera masumotoi Nomura, 1974: 105 , 112.

Additional material examined. China: 1 ♂ “China Kiang-Si T’en-gan/ 1075 Sericini Asia spec.” ( ZFMK) . Taiwan: 1 ♂ “834673/ Taiwan, Lanyu Island (Taitung Ciunty) Yung Hsin Farm N22°01.703 E121°34.642 29.-30.vii.2008, At light H. Mendel & M.V.L. Barclay BMNH(E) 2008-85” ( BMNH) .

Redescription. Length: 9.6 mm, length of elytra: 6.6 mm, width: 5.2 mm. Body oblong-oval, dark reddish brown, antenna yellowish, surface dull, labroclypeus shiny, except a few short setae on sides of elytra, glabrous.

Labroclypeus wide and subtrapezoidal, widest at base, lateral margins nearly straight and convergent anteriorly, anterior angles strongly rounded, anterior margin weakly emarginate medially; margins moderately reflexed; lateral margin and ocular canthus produce an indistinct angle; surface flat, with a very indistinct median elevation behind anterior margin, finely, densely punctate, with a few erect setae; frontoclypeal suture distinctly incised, angled medially; smooth area anterior to eye convex, four times as wide as long; ocular canthus short and narrow (1/3 of ocular diameter), finely densely punctate, with a long terminal seta. Frons dull, with moderately dense, fine punctures, with a few single setae beside eyes. Eyes moderately large, ratio diameter/ interocular width: 0.7. Antenna with ten antennomeres; club with three antennomeres and straight, 1.1 times as long as remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

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

Elytra widest at posterior third, striae finely impressed, finely and densely punctate, intervals slightly convex, with fine, moderately dense punctures being except on second interval partly concentrated along striae, with minute setae in punctures and penultimate interval with a few short setae, otherwise glabrous; epipleural margin robust, ending at nearly blunt 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: 1/1.6. Pygidium moderately convex, dull, finely and sparsely punctate, without smooth midline, with a few setae along apical margin.

Legs short and wide; femora dull, with two longitudinal rows of setae, finely and sparsely punctate. Anterior margin of metafemur acute, without adjacent serrated line, anterior row of setae completely reduced; posterior ventral margin smooth, moderately widened at ventral apex, dorsal posterior margin smooth, neither serrate, glabrous. Metatibia short and wide, widest at middle, ratio of width/length: 1/2.4, sharply carinate dorsally, with two groups of spines, basal group at middle, apical group at three quarters of metatibial length, in basal half with a few short single spines close to dorsal margin; lateral face longitudinally convex, nearly entirely impunctate, only a few fine punctures beside dorsal and ventral margin, glabrous; ventral margin finely serrate, with four 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 little shorter than following two tarsomeres combined and as long as dorsal tibial spur. Protibia moderately long, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 18 A–D. Habitus: Fig. 18E .

Distribution. See map ( Fig. 92 ) and Table 1.

Figures

FIGURE 18. A–E: Maladera masumotoi Nomura, 1974 (China: Kiang-Si); F–J: Maladera fusca (Frey, 1972) F–H: China: Fujian: Kuatun; I, J: holotype; K–N: M. cardoni (Brenske, 1896) (India: Almora). A, F, K: aedeagus, left side lateral view; D, H, M: aedeagus, right side lateral view; B, G, I, L: parameres, dorsal view; C: parameres, distal view; E, J, N: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 92. Distribution of the subgenus Omaladera: Maladera infuscata (Moser, 1915), M. johannesi Ahrens & Fabrizi, 2016, M. juntongi sp. n., M. masumotoi Nomura, 1974 (not precisely localized collection site indicated by a “?”), M. ovatula (Fairmaire, 1891).