Maladera invenusta ( Moser, 1918 )

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 : 100-102

Maladera invenusta ( Moser, 1918)

Figures 21 A–D, 95

Autoserica invenusta Moser, 1918: 212 ; Niijima & Kinoshita 1923: 29.

Maladera invenusta: Nomura, 1974: 106 ; Ahrens 2002: 85; 2006b: 237; 2007b: 23.

Type material examined. See Ahrens (2002).

Additional material examined. China: 1 ♂, 1 ♀ “ Banbaxiang, Fangcheng , Guangxi, 3.VI. 2000, 250m, leg. Li Wenzhu ” ( IZAS) , 1 ♂ “ Laoda , Anhui, 26.VI.1976, light trap, leg. Huang Ju ” ( IZAS) . Vietnam: 1 ♂ “N Vietnam Cuc Phuong Nat. Park 21.-22.v.1996 Pacholátko & Dembicky leg.” ( CP) , 1 ♂ “S Vietnam , 1.- 15.5.1994 Nam Cat Tien-Nat. Park P. Pacholátko & L. Dembicky leg.” ( CP) . Laos: 1 ♂ “ Laos centr., Khamousan prov. Nakai env., 4- 8.5.1998, Route No. 8, alt. 560± 20m N17°42.8’, E 105°08.9’ ( GPS), E. Jendek & O. Šauša leg.” ( CP) .

Redescription. Length: 6.8 mm, length of elytra: 5.0 mm, width: 4.0 mm. Body oval, black to blacking brown, 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 an indistinct angle; surface flat, finely and densely punctate, with numerous erect setae anteriorly; frontoclypeal suture indistinctly incised, curved; smooth area anterior to eye flat, 2.5 times as wide as long; ocular canthus long and moderately wide (nearly 1/2 of ocular diameter), finely and sparsely punctate, without terminal seta. Frons dull, with fine, dense punctures and a few single erect setae beside eyes. Eyes large, ratio diameter/ interocular width: 0.84. Antenna with ten antennomeres; club with three antennomeres and weakly reflexed, slightly longer than remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

Pronotum moderately transverse, widest at posterior third, lateral margins evenly convex and convergent anteriorly and posteriorly, anterior angles moderately produced and sharply pointed, posterior angles convex; 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 weakly convex and dull, coarsely and densely punctate, without smooth midline, with a few longer setae on apical half.

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: 1/2.4, sharply carinate dorsally, with two groups of spines, basal group at four sixths, apical group at five sixths of metatibial length, with a few short robust setae basally and a serrated line beside dorsal margin in basal half; lateral face weakly longitudinally convex, moderately densely punctate, with minute setae in punctures; ventral margin finely serrate, with four robust equidistant setae; 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. 21 A–C. Habitus: Fig. 21D .

Distribution. See map ( Fig. 95 ) and Table 1. This species was originally described from Taiwan, it is recorded for mainland China, Laos and Vietnam for the first time.

Figures

FIGURE 21. A–D: Maladera invenusta (Moser) (China: Guangxi: Banbaxiang); E–H: M. futschauana (Brenske, 1897) (syntype: Autosercia montivaga Moser, 1915; Vietnam: Montes Mauson); I–L: M. longruiensis Ahrens, Fabrizi & Liu, sp. n. (holotype). 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 95. Distribution of the Maladera teizoana group: Maladera fereobscurata sp. n., M. futschauana (Brenske, 1897), M. invenusta (Moser, 1918), Maladera piceola (Moser, 1915) (not precisely localized collection site indicated by a “?”).