Maladera guomenshanensis Ahrens, Fabrizi & Liu, 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 : 50-51

Maladera guomenshanensis Ahrens, Fabrizi & Liu , sp. n.

Figures 9 J–M, 88

Type material examined. Holotype: ♂ “[ China] Yunnan, Nabanhe Nature Reserve, Guomenshan , 2009-IV-6 / LW- 1354” ( ISAZ) . Paratype: 1 ♀ “[ China] Yunnan, Nabanhe Nature Reserve, Guomenshan , 2009-IV-6 / LW-1354” ( ZFMK) .

Description. Length: 14.7 mm, length of elytra: 9.4 mm, width: 7.0 mm. Body oval, dark brown, dull, antenna yellow, labroclypeus moderately shiny, glabrous except for a few short setae on head and lateral margins of pronotum and elytra.

Labroclypeus trapezoidal, widest at base, lateral margins convex and strongly convergent to strongly rounded anterior angles, lateral margin and ocular canthus producing an indistinct angle; margins weakly reflexed; anterior margin straight; surface weakly convex medially, coarsely and rugosely densely punctate, with a few erect setae anteriorly; frontoclypeal suture feebly incised and weakly bent medially; smooth area anterior to eye twice as wide as long; ocular canthus short and wide (1/4 of ocular diameter), finely scarcely punctate, with a short terminal seta. Frons dull, with fine, dense punctures, with robust setae beside eyes and along a transversal line on posterior part. Eyes moderately large, ratio of diameter/ interocular width: 0.7. Antenna with ten antennomeres; club with three antennomeres, as long as remaining antennomeres combined. Mentum elevated and flattened anteriorly.

Pronotum trapezoidal, widest at base, lateral margins weakly evenly convex and narrowed towards strongly produced and sharp anterior angles; posterior angles blunt; anterior margin convex, with complete and robust marginal line; basal margin without marginal line; surface finely and moderately densely punctate, punctures with microscopic setae only; anterior and lateral margins robustly setose; hypomeron carinate but not produced ventrally. Scutellum wide, triangular, with fine and dense punctures.

Elytra oblong, widest in posterior third, striae weakly impressed, finely and sparsely punctate, intervals weakly convex, with fine, sparse and evenly distributed punctures; glabrous, punctures with minute setae only; epipleural margin robust, ending at posterior third of elytra, epipleura sparsely setose; apical border membraneous, with a fine rim of short microtrichomes.

Ventral surface dull, with large and dense punctures, metasternum on disc densely robustly setose; metacoxa glabrous except for numerous long setae laterally; abdominal sternites finely and densely punctate, some punctures with very short or minute setae, each sternite with a distinct transverse row of coarse punctures bearing each a short seta; penultimate sternite apically with a wide shiny smooth chitinous border of 1/3 sternite length. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.35. Pygidium weakly convex, dull, finely and moderately densely punctate, glabrous except a few longer and shorter setae apically.

Legs moderately wide; femora finely and moderately densely punctate, with two longitudinal rows of setae. Metafemur wide, moderately shiny, anterior margin acute, without a fine adjacent and continuously serrated line, surface very sparsely and superficially punctate, anterior row of setae in basal half reduced; posterior ventral margin widened in apical half and not serrate, posterior margin dorsally not serrated, glabrous. Metatibia moderately wide and short, widest at middle, ratio width/length: 1/2.5, dorsal margin sharply carinate, with two groups of spines, basal one shortly behind middle, apical one at four fifths of metatibial length, beside dorsal margin basally with a few single robust setae; lateral face weakly longitudinally convex, smooth, on sides finely sparsely punctate; ventral margin finely serrate, with six strong equidistant spines; medial face impunctate, apex shallowly concave interiorly near tarsal articulation. Tarsomeres impunctate dorsally, with sparse, short setae ventrally; metatarsomeres glabrous ventrally and with a strongly serrated longitudinal ridge as well as a strong, smooth carina beside it, first metatarsomere as long as following two 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. 9 J–L. Habitus: Fig. 9M .

Diagnosis. Maladera guomenshanensis Ahrens, Fabrizi & Liu , sp. n. differs from most other Omaladera species in having wider hind legs, the head and pronotum with robust setae, as well as by the larger body size.

Etymology. The name (adjective in the nominative singular case) of the new species is derived from the name of its type locality, Guomenshan.

Variation. Length: 13.8–14.7 mm, length of elytra: 9.4–9.9 mm, width: 7.0– 7.5 mm. Female: eyes smaller than in male, ratio of diameter/interocular width: 0.49; antennal club with three antennomeres, little shorter than remaining antennomeres combined; pygidium weakly convex.

Distribution. See map ( Fig. 88 ) and Table 1.

Figures

FIGURE 9. A–E: Maladera hajeki Ahrens, Fabrizi & Liu, sp. n. (holotype); F–I: M. clypeata (Fairmaire, 1887) (Vietnam: Sa Pa); J–M: M. guomenshanensis Ahrens, Fabrizi & Liu, sp. n. (holotype). A, F, J: aedeagus, left side lateral view; D, H, L: aedeagus, right side lateral view; B, G, K: parameres, dorsal view; C: parameres, dorsal view; E, I, M: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 88. Distribution of the subgenus Omaladera: Maladera cariniceps (Moser, 1915b), M. clypeata (Fairmaire, 1887), M. guomenshanensis sp. n., M. hajeki sp. n..