Maladera formosae
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 formosae

description: Maladera formosae (Brenske, 1898)
Figures 15 A–F, 91
Autoserica formosae Brenske, 1898: 210; Niijima & Kinoshita 1923: 27; Serica formosae: Murayama 1954: 62.
Maladera formosae: Nomura 1974: 111; Kim & Lee, 1997: 129 (misidentified for Korea); Kim & Kim 2003: 92 (eleminated from faunal list: Korea).
Autoserica castanea Arrow, 1913: 398; Niijima & Kinoshita 1923: 29; Sim 1932: 380; Ahrens 2000b: 396; Aserica castanea: Murayama 1938: 14; Serica castanea: Murayama 1954: 44.
Maladera castanea: Nomura 1963: 124, 1969: 79, 1973: 135; Dawson 1967: 167; Nakane & Baba 1960: 4; Ritcher 1966: 76 (larva); Kalinina 1989: 417; Argaman 1990: 25; Kim & Lee 1997: 127, syn. n.
Serica korgei Petrovitz, 1967: 332; Ahrens 2000b: 396, syn. n.
Type material examined. Syntypes (formosae): 2 ♂♂, 1 ♀ “ Formosa / Ex. Museo H. W. Bates 1892/ formosae type Brsk./ Mus. Paris Ex. Coll. R. Oberth ̹r/ Type” (MNHN). Lectotype (castanea, here designated): ♂ “ Japan Lord Dornier 1896/ Type/ Sharp coll. 1905-313./ Autoserica castanea type Arrow” (BMNH).
Additional material examined. See also Ahrens (2000b). China: 1 ♂ “ China: Beijing; 100m; 9.-10.vii.1998; L. Bieber leg.” (CP), 2 ♂♂, 1 ♀ “Foochow, China 11-VI-36” (USNM), 1 ♂ “ Shekou, Fu‘an, Fujian, 28.VIII.1963, leg. Zhang Youwei ” (IZAS), 1 ♂, 1 ♀ “NE China, Tianjin province Tianjin Nankai University campus collected under lights 14.-20.vii.2010 P. Kment lgt.” (NMPC), 1 ♂ “ Fukien S. China Yungan, Siying pan 2.X.1940 T.C. Maa ” (BMH), 2 ♂♂ “ Fukien S. China Yungan, Siying pan 8.VI.1940 T.C. Maa ” (BMH), 1 ♂ “ Fukien S. China Yungan, Siying pan 30.V.1940 T.C. Maa ” (BMH), 1 ♂ “ Fukien S. China Yungan, Siying pan 5.VI.1940 T.C. Maa ” (BMH), 1 ♀ “ Fukien S. China Yungan, Siying pan 6.IX.1940 T.C. Maa ” (BMH), 3 ♂♂ “Fukien, S. China Shaowu Shuipeikai IV.1944 ” (BMH), 1 ♂ “ Hong Kong: N.T. Castle Peak 6-13.VIII.1964 / Lee Kit Ming & Hui Wai Ming collectors Bishop Museum ” (BMH), 1 ♂ “Kiang-Si T‘en-gan” (ZMHB), 2 ♂♂ “ Ile de Hainan Koi Hao R.P. Pénicard 1914” (MNHN), 16 ex. “ China Foochow 1935- 6 M. S. Yang ” (BMNH), 3 ex. “ China Foochow 10.v.1936 M.S. Yang ” (BMNH), 6 ex. “ Mamoa I., S.E. China J.J. Walker ” (BMNH). South Korea: 4 ex. “ 21.07.2010 Naksan, Sokcho, Gangwon-do (S̹dkorea) leg. T. Kölkebeck ” (ZFMK), 1 ex. “ 23.06.2010 Suri-san, Gunpo-si, Geonggi-do (S̹dkorea) leg. T. Kölkebeck ” (ZFMK).
Uncertain ID: 1 ♀ “NW China prov. Sin-Tiang Tchien-san mts., 24.7.1994 Borochoro, 2300m, tabor 200km w off Urumci J. Slorová lgt.” (NMPC).
Redescription. Length: 6.6 mm, length of elytra: 5.0 mm, width: 3.8 mm. Body oblong-oval, 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 an indistinct longitudinal elevation behind anterior margin, finely, densely punctate, with a few erect setae; frontoclypeal suture distinctly incised, angled medially; smooth area anterior to eye convex, twice as wide as long; ocular canthus short and narrow (1/3 of ocular diameter), finely densely punctate, with a terminal seta. Frons dull, with moderately dense, fine punctures, with a few single setae beside eyes. Eyes moderately large, ratio diameter/ interocular width: 0.64.Antenna with ten antennomeres; club with three antennomeres and straight, little longer than remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.
Pronotum transverse, widest at base, lateral margins in basal half nearly straight and weakly convergent anteriorly, in anterior half moderately evenly convex and moderately 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: 1/2.75, 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, with a fine punctures beside dorsal and ventral margin, glabrous; 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 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. 15 A–E. Habitus: Fig. 15F.
Remarks. Specimens from Tianjin and Beijing province do not differ from specimens of M. castanea from Japan. The types M. castanea and M. formosae are virtually identical in the shape of their left parameres. The right paramere exhibits some variation in shape among all populations, while the left paramere is essentially identical between all populations of the two species. Therefore, we consider these species as synonyms of one and the same taxon.
Distribution. See map (Fig. 91) 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 74-76, DOI: 10.11646/zootaxa.4922.1.1, http://zenodo.org/record/4496316