Maladera tibialis ( Brenske, 1898 ) 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 : 334-336

Maladera tibialis ( Brenske, 1898) comb. n.

Figures 80 A–D, 130

Autoserica tibialis Brenske, 1898: 359 .

Type material examined. Syntypes: ♂ “ Saigon Donckier v./ tibialis Type Brsk./ coll. Brenske ” ( ZMHB) , 1 ♂ “Saigon Donckier v./ coll. Brenske ” ( ZMHB) , 1 ♀ “ Saigon Donckier v./ tibialis Type Brsk./ 9gld.” ( ZMHB) , 1 ♀ ”Saigon Donckier v./ erinnert oberflächlich an picea Nonfr. mit breiten Hinterschenkeln/ coll. Brenske “ ( ZMHB) .

Additional material examined. China: 1 ♂, 1 ♀ “ Lishui to Bihu , 10.V.1982 ” ( IZAS) , 1 ♂ “ Qingnian Forestry Farm, Jiufo , Guangdong, 16.II.1965 ” ( IZAS) , 1 ♂, 1 ♀ “ Dong‘an , Hunan, 21.V.1954 ” ( IZAS) , 3 ♂♂, 3 ♀♀ “ Fukien S. China Yangan, Siying pan 16.V.1942 T.C. Maa ” ( BMH) , 1 ♀ “ Fukien S. China Yangan, Siying pan 30.V.1940 T.C. Maa ” ( BMH) , 1 ♀ “ Fukien S. China Yangan, Siying pan 9.V.1942 T.C. Maa ” ( BMH) , 1 ♂ “ S. China: Fukien Yangan , 23.V.1940 / T.C. Maa collector Bishop Mus.” ( BMH) , 1 ♂ “ Fukien S. China: Shaowu, Shuipeichieh 28.iii.1942 / T.C. Maa collector Bishop Mus.” ( BMH) , 2 ♂♂, 3 ♀♀ “ Fukien S. China: Shaowu, Shuipei-kai 3.IV.1942 / T.C. Maa collector” ( BMH) , 3 ♂♂, 18 ♀♀ “ Fukien S. China: Shaowu, Shuipei-kai 9.IV.1942 / T.C. Maa collector” ( BMH) , 1 ♂ “ Kiang-Si Chang-tsin-cheng” ( ZMHB) . Cambodia: 154 ex. “ Cambodia : 15 km SE Tuol Kruos h= 100 m, 11°11’48’’N, 104°E, 20.-28.XII.1999 leg. M. & S. Murzin ” ( ZFMK) , 1 ex. “ Cambodia: Kirirom Nat. Park , 780 m, 11°21’23’’N, 104°4’38’’E, 2-17.I. XII.2000 leg. M. & S. Murzin “ ( ZFMK) . Thailand: 1 ♂ “ Thail. Ko Samui Coral Cave light 0-10 NN 23.4.1991 / leg. F. Hiess ” ( ZFMK) , 1 ex. “ Ban Angkhai, alt. 750m, Samoeng Distr. Chiang Mai pref. Thailand 15-20-V-1998 K. Masumoto leg.“ ( ZFMK) , 1 ♂ “ Thai 21.-26.V.1993 Namuang Pacholátko & Dembicky leg.” ( CP) , 1 ♂ “ Thai , NE, Loei prov. Phu Rua N.P., 1100m, 17°30’N, 101°21’E, 6.-9.iv.1999, M. Riha leg.” ( CP) . Laos: 1 ♂ “S Laos Champasak, Ban Itou , 800m, 10.-18.iv.1999, 15°10’N, 106°05.8’E M. Strba” ( CP) . Vietnam: 3 ex. “Annam Phuc Son Nov. Dez. H. Fruhstorfer” ( ZMHB) , 2 ex. “Conchinchina” ( ZMHB) , 8 ex. “Tonkin Dap ban” ( ZMHB) , 1 ♂ “ Coll. R.I.Sc.N.B. Sud Vietnam / Collection E. Candeze/ Conchinch./ Coll. Burmeister ” ( ISNB) , 1 ♂ “S Vietnam , 1.- 15.5.1994 Nam Cat Tien–Nat. Park P. Pacholátko & L. Dembicky leg.” ( CP) , 1 ♂ “S Vietnam, 14.10N 108.30E 40 km NW of An Khe Buon Luoi , 620-750m 28.3.- 12.4.1995 Pacholátko & Dembicky leg.” ( CP) . Malaysia: 2 ex. “ Butterworth Penang, Malaysia 22 Apr 1975 Mike Avery” ( CPLM) .

Redescription. Length: 8.9 mm, length of elytra: 7.2 mm, width: 5.5 mm. Body oblong, reddish to dark reddish brown, antenna yellowish, surface dull, labroclypeus and anterior frons narrowly shiny, except a few short setae on head and sides of elytra, glabrous.

Labroclypeus wide and subtrapezoidal, widest at base, lateral margins convex and strongly convergent anteriorly, anterior angles moderately rounded; anterior margin weakly emarginate medially; margins moderately reflexed; lateral margin and ocular canthus produce an indistinct angle; surface moderately convex medially, coarsely, densely punctate, on disc punctures fusing with each other, with a few single erect setae on anterior third; frontoclypeal suture finely incised, angled medially; smooth area anterior to eye convex, 1.5 times as wide as long; ocular canthus short and narrow (1/3 of ocular diameter), finely densely punctate, 1-2 terminal setae present. Frons in most parts dull, anteriorly narrowly tomentum lacking, with moderately dense, irregular, fine punctures, with a few single setae beside eyes. Eyes small, ratio diameter/ interocular width: 0.51. Antenna with ten antennomeres; club with three antennomeres and straight, distinctly shorter than remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

Pronotum narrow, widest at posterior third, lateral margins in evenly convex, moderately convergent anteriorly and posteriorly, 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, erect setae, otherwise with minute setae in punctures; 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 as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.53. Pygidium weakly convex, dull, finely and densely punctate, without smooth midline, with short setae throughout and a few long 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, without adjacent serrated line; posterior ventral margin smooth, not widened at apex, dorsal posterior margin smooth, neither serrate, glabrous. Metatibia long and moderately wide, widest at middle, ratio of width/length: 1/2.6, sharply carinate dorsally, with two groups of spines, basal group at one third, apical group at two thirds of metatibial length, in basal half a few short single spines; lateral face longitudinally convex, finely sparsely punctate on sides, glabrous; ventral margin finely serrate, with four robust setae of which distal one is more distant; 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 shorter than following two tarsomeres combined and little longer than dorsal tibial spur. Protibia moderately long, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 80 A–C. Habitus: Fig. 80D .

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.