Maladera rotunda (Arrow, 1946) Fabrizi & Liu & Bai & Yang & Ahrens, 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 : 336-337

Maladera rotunda (Arrow, 1946) comb.n.

Figures 80 E–H, 130

Cephaloserica rotunda Arrow, 1946b: 16 .

Type material examined. Syntypes: 1 ♂ “ Burma ca. 200 m Washaung , 20 km East of Myitkyina 14.VII.34 Malaise/ N. E. Burma R Malaise B. M. 1945-71/ ♂ / Cotype / Cephaloserica rotunda Arr. co-type” ( BMNH) , 1 ♀ “N. East Burma Sadon 1200 m 28.6.-5.7. Malaise / N. E. Burma R Malaise B. M. 1945-71/ Cotype / Cephaloserica rotunda Arr. co-type” ( BMNH) , 1 ♂ “ Burma ca. 200 m Washaung , 20 km East of Myitkyina 14.VII.34 Malaise / Cephaloserica rotunda type Arrow / Typus / 3733 E91” ( NHRS) , 1 ♀ “ N. East Burma Sadon 1200 m 28.6.-5.7. Malaise / Cephaloserica rotunda n. sp. Arrow / rotunda Arrow / 3735 E91” ( NHRS) , 1 ♂ “ Burma 1934 Myitkyina , 175m. 15- 30/7 Malaise / Paratypus / 3734 E91” ( NHRS) .

Additional material examined. China: 1 ♂ “ Jinggu , Yunnan, 24.IV. 1955, 930m, leg. Vuschik ” ( IZAS) , 1 ♂ “ Liuku , Yunnan, 13.VI. 1981, 900m, leg. Liao Subai ” ( IZAS) , 1 ♂ “ Jinggu , Yunnan, 22.IV. 1955, 930m, leg. Krischnovsknja” ( IZAS) . Myanmar: 1 ex. (♂) “ Birmania S. S. S. Monti Cariani Bihtan 5-1937 R. Perego” ( MSNM) , 4 ♂♂ “ Coll. R.I. Sc. N. B. Birmanie / Birmanie 1911/ R. Ley coll. Le Moult vendit” ( ISNB) , 1 ♂ “ Burma (Myanmar) SW Shan State Taunggyi J. Rejsek 1.- 18.6.1997 ” ( ZFMK) . Laos: 1 ♂ “ Vientiane I.60 Laos (Baudon)/ 416 Sericini Asia spec.” ( NHMB) . Thailand: 1 ♂ “ Coll. R.I.Sc.N.B. Thailand / Siam N. Xieng-Sen 24.II.1932 Prince Leopold” ( ISNB) , 1 ♂ “ Chiang Mai N. Thailand V 1985 N. Koyama leg.” ( ZFMK) .

Redescription. Length: 8.8 mm, length of elytra: 6.4 mm, width: 5.8 mm. Body oval, dark brown, antenna yellowish, surface dull, labroclypeus shiny, except a few short setae on head and sides of elytra, glabrous.

Labroclypeus wide and subtrapezoidal, widest at base, lateral margins weakly convex and strongly convergent anteriorly, anterior angles blunt; anterior margin weakly emarginate medially; margins moderately but angled and midpoint of median anterior emargination tooth-like reflexed; lateral margin and ocular canthus produce an indistinct angle; surface flat, coarsely, densely punctate, with a transverse row of erect setae behind anterior margin; frontoclypeal suture finely incised, angled medially; smooth area anterior to eye convex, three times as wide as long; ocular canthus short and narrow (1/3 of ocular diameter), finely densely punctate, terminal setae absent. Frons dull, with dense, fine punctures, with a few single short setae beside eyes. Eyes moderately large, ratio diameter/ interocular width: 0.69. Antenna with ten antennomeres; club with three antennomeres and straight, little longer than remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

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

Elytra convex, widest at posterior third, striae finely impressed, finely and densely punctate, intervals flat, with fine, moderately dense punctures, odd intervals with a few single short setae, otherwise with minute setae in punctures only; 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 1.5 times as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.38. Pygidium weakly convex, dull, finely and densely punctate, without smooth midline, with a few setae along apical margin.

Legs moderately short and wide; femora shiny, with two longitudinal rows of setae, finely and sparsely punctate. Anterior margin of metafemur acute, with adjacent continuously serrated line; posterior ventral margin smooth, strongly widened at apex, dorsal posterior margin smooth, neither serrate, finely setose. Metatibia long and moderately wide, widest at middle, ratio of width/length: 1/2.2, sharply carinate dorsally, with two groups of spines, basal group at middle, apical group at three quarters of metatibial length, in basal half a few short single spines; lateral face longitudinally convex, finely densely punctate on sides, impunctate along midline, punctures with minute setae; ventral margin finely serrate, with six 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 slightly longer than following tarsomere 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. 80 E–G. Habitus: Fig. 80H .

Distribution. See map ( Fig. 130 ) and Table 1.

Figures

FIGURE 80. A–D: Maladera tibialis (Brenske, 1898) (Cambodia: Tuoi Kruos); E–H: M. rotunda (Arrow, 1946) (China: Yunnan: Jinggu). A, E: aedeagus, left side lateral view; C, G: aedeagus, right side lateral view; B, F: parameres, dorsal view; D, H: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 130. Distribution of Maladera species with uncertain systematic status: Maladera panyuensis sp. n., M. parva (Moser, 1908), Maladera punctulata (Frey, 1972), M. rotunda (Arrow, 1946), M. tibialis (Brenske, 1898), M. trifidiforceps sp. n., M. wandingana sp. n.