Maladera stridula ( Brenske, 1897 )

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 : 190-192

Maladera stridula ( Brenske, 1897)

Figures 43 E–H, 110

Autoserica stridula Brenske, 1897: 401 ; Niijima & Kinoshita 1927: 7.

Aserica stridula: Murayama 1938: 13 .

Serica stridula: Murayama 1954: 44 .

Maladera stridula: Ahrens 2002: 81 ; 2006b: 238; 2007b: 24.

Additional material examined. China: 1 ♂ “ China Yunnan ” ( ZMHB) , 3 ♂♂, 2 ♀♀ “ Hupe Tan-che-chan 900- 1500 m ” ( ZMHB) , 1 ♂, 2 ♀♀ “ China Hainan I./ stridula Brsk. ” ( ZMHB) , 1 ex. “ Hangchow China VII-VIII 1924 Coll. H.A. Jaynes ” ( USNM) , 1 ex. “ Hong Kong / D.T.Fullaway Collector ” ( USNM) , 1 ex. “ China Tsingtau 26 April 1926 D.C. Graham ” ( USNM) , 1 ♂ “ Mt. Dinghushan , Guangdong, 15.V.1965, leg. Lin Ping, Luo Yuliang ” ( IZAS) , 1 ♂ “ Dinghu , Guangdong, 26.IV.1965, leg. Zhang Youwei ” ( IZAS) , 1 ♂ “ Tongxian County, Beijing, 21.VI.1972, light trap ” ( IZAS) , 1 ♂ “ Jingdong , Yunnan, 29.IV.1957, 1200m, leg. Montschadsky ” ( IZAS) , 1 ♂ “ Prov. Hopeh, Sienhsien , Musee Heude” ( IZAS) , 1 ♂ “ Tunchang , Hainan, VII.1956, No. 02808” ( IZAS) , 2 ♂♂, 1 ♀ “ Sean No. 19, Yaosam ( Kwangsi ), 11.VII.1934, leg. H.C. Tao ” ( IZAS) , 1 ♂ “ Tongshi , Hainan, Guangdong, 22.IV. 1960, 340m, leg. Zhang Xuezhong ” ( IZAS) , 1 ♂, 1 ♀ “ Qingmaqu, Baiyang , Sichuan, mid of IV, 1976, No.4” ( IZAS) , 1 ♂ “ China: Wen Chuan Tay June 1922 R. Buddle. B.M. 1924-162” ( BMNH) . Vietnam: 1 ♂ “ Saigon ” ( IZAS) , 23 ex. “Vietnam-N. (Na Hang 160 km NW Hanoi, NE env. of Na Hang 26.5.- 6.6.1996 150-200 m lg. A. Napolov & I. Roma ” ( CNA) , 6 ex. N Vietnam (Tonkin) Ha Noi (city) 4.-5.v.1990 P. Pacholatko leg.” ( CP), 3 ex. “Vietnam-N. (Na Hang 160 km NW Hanoi, NE env. of Na Hang 3.- 14.6.1996 150-200 m lg. A. Napolov & I. Roma ” ( CNA), 7 ex. “ Tonkin Dap ban” ( ZMHB), 2 ♂♂ “ Tonkin Hanoi ” ( ZMHB), 1 ♂ “ Hoa-Binh, Tonkin, 11.VII.1934, leg. A. de Cooman ” ( IZAS), 2 ♂♂, 2 ♀♀ “Vietnam-N, Cao Bang prov. 12 km NE Cao Bang, 650+ 50m 22°45’45’’N 106°19’E L. Dembicky leg., 15.-16.V.2010 ” ( ZFMK), 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: 10.5 mm, length of elytra: 7.2 mm, width: 6.0 mm. Body oval, reddish to dark reddish brown, antenna brown, labroclypeus shiny, remainder of dorsal surface dull, with a few short setae on the head and elytra.

Labroclypeus subtrapezoidal, moderately wider than long, widest at base; lateral margins weakly convex and moderately convergent to strongly rounded anterior angles, lateral margin and ocular canthus producing a distinct blunt angle, margins weakly reflexed, anteriorly weakly emarginate medially; surface weakly carinate medially, shiny, coarsely and densely punctate, distance between punctures smaller their diameter, with few long, erect setae anteriorly; frontoclypeal suture weakly impressed and moderately angled medially; smooth area in front of eye approximately three times as wide as long; ocular canthus short and wide, finely punctate, with a terminal seta. Frons dull, with fine, dense punctures, glabrous except for a few single setae beside eyes. Eyes small, ratio of diameter/ interocular width: 0.61. Antenna with 10 antennomeres; club with three antennomeres, as long as remaining antennomeres combined. Mentum anteriorly elevated and flattened.

Pronotum subtrapezoidal, widest shortly before base, lateral margins moderately evenly convex and strongly convergent anteriorly, anterior angles distinctly produced; anterior marginal line robust and complete, margin weakly convexly produced medially; basal margin without marginal line; surface finely and densely punctate, with minute setae in punctures only; anterior and lateral margins sparsely setose; hypomeron carinate but not ventrally produced. Scutellum wide, triangular, with fine and dense punctures, each bearing a single very minute seta.

Elytra oblong, widest at middle, striae weakly impressed, finely and densely punctate; intervals weakly elevated, with fine, dense punctures, penultimate interval with a few fine, erect, short setae, otherwise punctures with minute setae; epipleural margin robust, ending at strongly rounded external apical angle of elytra; epipleura densely setose; apical border membraneous, with short microtrichomes.

Ventral surface dull, metasternum and metacoxa with fine and dense punctures, sparsely setose; metacoxa glabrous except for a few long setae laterally. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/2.1. Abdominal sternites, in addition to fine and moderately dense punctures, each with a distinct transverse row of coarse punctures each bearing a short and robust seta, punctures with microscopic setae; penultimate sternite apically with a shiny smooth chitinous border, which is one third as long as sternite. Pygidium moderately convex, finely and moderately densely punctate, without smooth midline, punctures with microscopic setae and with a few long setae along apical margin.

Legs long and moderately wide; femora with two longitudinal rows of setae, finely and sparsely punctate. Metafemur dull, anterior margin acute, lacking an adjacent serrated line, posterior ventral margin medially straight, weakly widened in apical half and not serrate, dorsally not serrated, finely setose. Metatibia moderately wide and long, widest at apex, ratio of width/length: 1/2.2; sharply carinate dorsally, with two groups of spines, basal one shortly before the middle, apical one at three quarters of metatibial length, with a few robust spines basally; lateral face longitudinally convex, impunctate except for sparse and fine punctures on dorsal portion; ventral margin serrate, with four equidistant spines; medial face impunctate; apex interiorly near tarsal articulation shallowly concave. Tarsomeres impunctate dorsally, ventrally with sparse, short setae; metatarsomeres ventrally with a strongly serrated ridge, beside which is not a strong longitudinal carina; first metatarsomere slightly shorter than two following tarsomeres combined and slightly longer than dorsal tibial spur. Protibia short, bidentate. All claws symmetrical, feebly curved and long, with normally developed basal tooth.

Aedeagus: Fig. 43 E–G. Habitus: Fig. 43H .

Distribution. See map ( Fig. 110 ) and Table 1.

Figures

FIGURE 43. A–D: Maladera drescheri (Moser, 1913) (Thailand: Bo Klua); E–H: M. stridula (Brenske, 1897) (Taiwan: Kenting); I–L: M. ninglangensis Ahrens, Fabrizi & Liu, sp. n. 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 110. Distribution of the Maladera drescheri group: Maladera drescheri (Moser, 1913), M. ninglangensis sp. n., M. stridula (Brenske, 1897).