Maladera saitoi ( Niijima & Kinoshita, 1927 )

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 : 99-100

Maladera saitoi ( Niijima & Kinoshita, 1927)

Figures 20 I–L, 96

Autoserica saitoi Niijima & Kinoshita, 1927: 10 .

Maladera saitoi: Nomura 1963: 124, 1973: 136 ; Ahrens 2002: 85, 2006b: 238, 2007b: 24.

Additional material examined. China: 1 ♂ “ Xiangshui, Boluo , Guangdong, 30.V.1965, leg. Zhang Youwei ” ( IZAS) , 1 ♂ “ Xiangshui, Boluo , Guangdong, 28,30. V.1965, leg. Zhang Youwei ” ( IZAS) , 1 ♂ “ Mengla, Jinping , Yunnan, 15.IV. 1956, 370m, leg. Huang Keren etc.” ( IZAS) , 1 ♂ “ Liangfeng, Guilin , Guangxi, 3.VI.1952 ” ( IZAS) , 1 ♂ “ Nada , Hainan, 30.IV.1954, leg. Huang Keren ” ( IZAS) , 1 ♂ “ Xiangshui, Boluo , Guangdong, 31.V.1965, leg. Zhang Youwei ” ( IZAS) , 1 ♂ “ Hekou , Yunnan, 7.VI.1958, 80m, light trap, leg. Hueng Keren etc.” ( IZAS) , 1 ♂ “ Bawangzhen, Changjiang , Hainan, 5-7.VI.2008, leg. Ba Yibin, Lang Juntong ” ( HBUM) , 1 ♂ “ Fukien ; S. China 24.V.1940 T. Maa” ( BMH) , 1 ♂ “ Fukien S. China Yungan, Siying pan 30.V.1940 T.C. Maa” ( BMH) , 1 ♀ “ Fukien S. China Yungan, Siying pan 17.V.1941 T.C. Maa” ( BMH) , 1 ♀ Fukien S. China Yungan, Siying pan 6.IX.1940 T.C. Maa ” ( BMH), 1 ♀ “ Fukein, S. China Shaowu City 1944 12.V. T. Maa ” ( BMH), 2 ♂♂ “ Hainan I. J. Whitelead 99.315” ( BMNH), 1 ♀ “ Fukien, S. China Chungah: Bohea Hills T.C. Maa ” ( BMH). Laos: 4 ex. “ Laos, La Oudomxay 16.6.2005, ex. Coll. Sabatinelli ” ( ZFMK), 3 ex. “ Laos , Borikhamai 07.V.1994; leg. Wakahara ” ( ZFMK), 1 ♂ “ Museum Paris Laos Xieng Khouang ( Vitalis de Salvasa ) Coll. A. Grouvelle 1917” ( MNHN). Vietnam: 15 ex. “N- Vietnam Thai Nguyen Prov., vic Ngoc Thanh, Me Linh (IEBR station), 12.V.2012, 21°23’3’’N, 105°42’44’’E, 60- 80m, leg. A. Skale ” ( CASH), 27 ex. “N-Vietnam Cao Bang Prov., vic. Vin Den, Nui Pia Oac Nat. Res. 06.-10.V.2013, 22°33’53’’N, 105°52’53’’E 900-1300m A. Skale ” ( CASH), 1 ex. “N-Vietnam, P: Thai Nguyen, vic. Ngoc Than , Me Linh (IEBR station), 16.V.2017, 21°23’3’’N, 105°42’44’’E, 70m NN, leg. A. Weigel, LFF” ( NME) .

Redescription. Length: 6.5 mm, length of elytra: 4.9 mm, width: 4.4 mm. Body oval, dark brown to blackish, antenna yellow, club brown, dorsal surface dull, except some single setae on head dorsal surface nearly glabrous.

Labroclypeus moderately wide and trapezoidal, shiny, widest at base, lateral margins weakly convex and strongly convergent anteriorly, anterior angles blunt and slightly reflexed, anterior margin moderately emarginate, margins moderately reflexed; lateral margin and ocular canthus produce a blunt angle; surface flat, finely and densely punctate, with numerous erect setae anteriorly; frontoclypeal suture indistinctly incised, curved; smooth area anterior to eye flat, as wide as long; ocular canthus long and moderately wide (nearly 1/3 of ocular diameter), finely and sparsely punctate, with a terminal seta. Frons dull, with fine, dense punctures and a few single erect setae beside eyes. Eyes large, ratio diameter/ interocular width: 0.73. Antenna with ten antennomeres; club with three antennomeres and weakly reflexed, as long as remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

Pronotum moderately transverse, widest at base, lateral margins evenly convex and moderately convergent anteriorly, anterior angles moderately produced and right-angled, posterior angles blunt, weakly rounded at tip; anterior margin weakly convex, with fine and complete marginal line, base without marginal line; surface finely and densely punctate, with minute setae in punctures, otherwise glabrous; lateral and anterior margin finely setose; hypomeron carinate, not produced ventrally. Scutellum wide, triangular, dull, with fine, sparse punctures.

Elytra widest shortly behind middle, striae distinctly impressed, finely and sparsely punctate, intervals weakly convex, with fine and sparse punctures concentrated along striae, with minute setae in punctures, odd intervals with a few single short setae; epipleural margin robust, ending at strongly curved external apical angle of elytra, epipleura densely setose; apical border of elytra not membraneous, without visible rim of microtrichomes (at ca 100x magnification).

Ventral surface dull, coarsely and moderately densely punctate, metasternum sparsely covered with sparse fine setae; metacoxa with a few longer setae laterally, otherwise glabrous. Abdominal sternites finely and irregularly densely punctate, glabrous, each sternite with a transverse row of coarse punctures each bearing a robust long seta. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.6. Pygidium moderately convex and dull, coarsely and densely punctate, without smooth midline, with a few longer setae along apical margin.

Legs moderately wide and short, weakly shiny; femora with two longitudinal rows of setae, finely and sparsely punctate. Metafemur dull, with anterior margin acute, with continuous serrated line behind anterior margin, setae of anterior row very short; posterior margin smooth and moderately widened at apex ventrally, not serrate dorsally, with just a few short setae basally. Metatibia short, widest at apex, ratio of width/length: 1/2.5, sharply carinate dorsally, with two groups of spines, basal group at three fifths, apical group at four fifths of metatibial length, with a few short robust setae basally and a continuously serrated line beside dorsal margin in basal half; lateral face weakly longitudinally convex, sparsely punctate on basal half, with minute setae in punctures; ventral margin finely serrate, with four robust setae of which the apical one is more distant; medial face smooth and glabrous; apex finely serrate, moderately truncate interiorly near tarsal articulation. Tarsomeres dorsally smooth and glabrous, neither laterally nor dorsally carinate, sparsely setose ventrally; metatarsomeres with a strongly serrated ridge ventrally and a smooth subventral longitudinal carina; first metatarsomere slightly shorter than following two tarsomeres combined and slightly longer than dorsal tibial spur. Protibia short, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 20 I–K. Habitus: Fig. 20L .

Distribution. See map ( Fig. 96 ) and Table 1.

Figures

FIGURE 20. A–D: Maladera shengqiaoae Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. fereobscurata Ahrens, Fabrizi & Liu, sp. n. (holotype); I–L: M. saitoi (Niijima & Kinoshita, 1927) (Laos: Borikhamai). 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 96. Distribution of the Maladera teizoana group: Maladera longruiensis sp. n., M. obscurata (Moser, 1915), M. parobscurata sp. n., M. saitoi (Niijima & Kinoshita, 1927), M. shengqiaoae sp. n..