Maladera euphorbiae ( Burmeister, 1855 )

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 : 26-27

Maladera euphorbiae ( Burmeister, 1855)

Figures 3 J–M, 85

Serica euphorbiae Burmeister, 1855: 177 ; Brenske 1897: 362.

Amaladera euphorbiae: Reitter 1896: 186 ; Dalla Torre 1912: 19; Medvedev 1952: 145.

Maladera (Amaladera) euphorbiae: Ahrens 2006b: 234 ; 2007b: 18.

Serica fusca Ballion, 1870: 339 ; syn by Reitter 1896: 186; Brenske 1897: 362.

Additional material examined. China: 1 ♂ “ Ining , Xinjiang, VI.1984 ” ( IZAS) , 2 ♂♂ “ Yining , Xinjiang, mid of VI.1983, leg. Wang Aijing ” ( IZAS) .

Redescription. Length: 7.5 mm, length of elytra: 5.2 mm, width: 4.1 mm. Body wide, oval, yellowish brown, dorsal surface dull, labroclypeus, tarsomeres, and tibiae shiny, glabrous.

Labroclypeus moderately wide, lateral margins straight and moderately convergent, lateral margins produce with ocular canthus a blunt angle, anterior angles moderately convex, anterior margin distinctly emarginate medially, margins weakly reflexed; surface flat and moderately shiny, coarsely and densely punctate, distance between punctures smaller their diameter, with numerous long erect setae; smooth area in front of eyes twice as wide as long; frontoclypeal suture finely incised, slightly elevated and bluntly angled medially; ocular canthus moderately wide and short (1/3 of ocular diameter), finely and densely punctate, with a short terminal seta. Eyes moderately large, ratio diameter/ interocular width: 0.65. Frons with fine and moderately dense punctures, with a few single setae beside eyes. Antenna with nine antennomeres, club with three antennomeres and straight, 1.2 times as long as remaining antennomeres combined. Mentum convexly elevated and flattened anteriorly.

Pronotum widest at base, lateral margins in basal half straight and weakly convergent anteriorly, in anterior half moderately convex and convergent anteriorly, anterior angles nearly blunt and weakly produced, posterior angles blunt; anterior margin convex, with complete and fine marginal line; basal margin without marginal line; surface finely and densely punctate, punctures with microscopic setae only, setae of lateral and anterior margin sparse; hypomeron carinate. Scutellum wide, triangular, punctation as in pronotum.

Elytra convex, widest at posterior third, striae finely impressed, finely punctate, intervals weakly convex, finely and densely punctate, punctures concentrated along striae, with minute setae in punctures, odd intervals with a few erect short setae; epipleura ending at strongly rounded external apical angle of elytra, sparsely setose; apex of elytra with a fine membraneous rim of short microtrichomes.

Ventral face coarsely and densely punctate, nearly glabrous, only metasternal plate and lateral metacoxa with a few robust setae. Distance between mesocoxae little less than width of mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.3. Abdominal sternites finely and moderately densely punctate, each with a row of coarse punctures bearing each a robust seta; penultimate sternite medially retracted, ultimate sternite twice as long as penultimate. Pygidium moderately convex, coarsely and densely punctate, on apex with a few long setae.

Legs moderately long and wide; femora superficially and sparsely punctate, with two longitudinal rows of setae. Metafemur shiny, anterior margin acute, without adjacent serrated line, anterior longitudinal row of setae present; posterior ventral margin almost straight, little widened in apical half and smooth, and dorsal posterior margin also smooth, densely setose. Metatibia moderately long and wide, dorsal and ventral margin subparallel, ratio width/length: 1/3.6, sharply carinate dorsally, with two groups of spines, basal one at basal third, apical one at two thirds of metatibial length, basally with a few single fine and short setae; lateral face weakly longitudinally convex, with fine and sparse punctures; ventral margin with three widely separated spines, of which the distal one is more distant; medial face impunctate, apex shallowly and concavely emarginate interiorly near tarsal articulation. Tarsomeres dorsally very sparsely and finely punctate, neither laterally nor dorsally carinate, ventrally finely sparsely setose; metatarsomeres ventrally with a strongly serrated ridge, first metatarsomere slightly longer than following tarsomere 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. 3 J–L. Habitus: Fig. 3M .

Distribution. See map ( Fig. 85 ) and Table 1.

Figures

FIGURE 3. A–E: Maladera secreta (Brenske, 1897) (holotype: Autoserica cruralis Frey, 1972); F–I: M. shaowuensis Ahrens, Fabrizi & Liu, Ahrens, Fabrizi & Liu, sp. n. (holotype); J–M: M. euphorbiae (Burmeister, 1855) (China: Xinjiang: Ining). A, F, J: aedeagus, left side lateral view; D, H, L: aedeagus, right side lateral view; B, C, G, K: parameres, dorsal view; E, I, M: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 85. Distribution of the subgenus Amaladera: Maladera euphorbiae (Burmeister, 1855).