Maladera haba 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 : 248-249

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

Figures 58 A–D, 120

Type material examined. Holotype: ♂ “ China Yunnan 2000-3000m 27.20N 100.11E Habashan mt. SE slope 10.- 13.7. David Kral leg. 92/ coll. Milan Nikodym, Praha/ 549 Sericini Asia spec.” ( ZFMK) . Paratypes: 5 ♂♂, 2 ♀♀ “ China Yunnan 2000-3000m 27.20N 100.11E Habashan mt. SE slope 10.-13.7. David Kral leg. 92/ coll. Milan Nikodym, Praha ” ( ZFMK) , 12 ♂♂, 17 ♀♀ “ China Yunnan 2000-3000m 27°20’N 100°11’E Habashan Mts. SE slope, 10.[-] 13.7.1992. D. Kral lgt.” ( NMPC) , 14 ♂♂, 10 ♀♀ “[ China] Yunnan 2000-3000m 27.20N 100.11E Habashan mts. SE slope 10-13/7. Vit Kuban leg. 92” ( CP, ZFMK) , 7 ♀♀ “ China: Yunnan Habashan Mts. SE slope, 2000-3000 m, 10.-13.VII.1992 lgt. V. Kuban ” ( ZFMK) , 1 ♀ “[ China] Yunnan 2000-2500m 25.42N 100.08E Cangshan mts. E slope 21/6.92 Vit Kuban leg.” ( ZFMK) , 5 ♂♂, 13 ♀♀ “ China: Yunnan prov.; Daju- 50 km N Lijiang ; 27.21N 100.19E; S. Becvar leg.; 21.-27.vi.1993 ” ( CP) , 5 ♂♂, 10 ♀♀ “ China: Yunnan prov.; Heishui ; 16.-19.iii.1993; L. Bocak leg.” ( CP) , 3 ♂♂, 9 ♀♀ “[ China] Yunnan 2050m 27.18N 100.12E Jinsha riv. 15/6. Vit Kuban leg. 1993” ( CP) , 4 ♀♀ “ China Yunnan 27.-28.VI. Daju, 50 km M Lijiang 27°21’N 100°19’E E. Jendek leg. 1992” ( NHMW) .

Description. Length: 5.5 mm, length of elytra: 3.7 mm, width: 3.2 mm. Body elongate, dorsal and ventral face including legs and antennae yellow, elytra shiny, head, scutellum, and pronotum moderately shiny, except some single setae on head dorsal surface nearly glabrous.

Labroclypeus short and wide, trapezoidal, widest at base, lateral margins moderately convex and strongly convergent anteriorly, anterior angles weakly rounded; anterior margin distinctly emarginate medially, margins weakly reflexed; lateral margin and ocular canthus produce an indistinct angle; surface weakly convexly elevated, rugosely and densely punctate, with a few erect setae anteriorly; frontoclypeal suture finely incised, curved; smooth area anterior to eye flat, 2.5 times as wide as long; ocular canthus moderately long and narrow (1/3 of ocular diameter), finely densely punctate, without terminal seta. Frons moderately shiny, with evenly dense, fine punctures and a few single setae beside eyes. Eyes small, ratio diameter/ interocular width: 0.64. Antenna with ten antennomeres; club with three antennomeres and straight, as long as remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

Pronotum transverse, widest shortly behind middle, lateral margins evenly convex and moderately convergent anteriorly, anterior angles produced and sharp, posterior angles blunt; anterior margin slightly convex, with complete fine marginal line, base except around posterior angles without marginal line; surface finely and densely punctate, with minute setae in punctures; anterior and lateral margin sparsely setose; hypomeron not carinate. Scutellum narrowly triangular, with fine, dense punctures.

Elytra widest at posterior quarter, striae finely impressed, finely and sparsely punctate, odd intervals weakly convex and distinctly narrower than even, flat intervals, even intervals with fine, dense punctures, odd intervals with less dense punctures, glabrous, odd intervals with a few single short setae; epipleural margin fine, ending at rounded external apical angle of elytra, epipleura densely setose; apical border of elytra with a fine rim of microtrichomes (at ca 100x magnification).

Ventral surface shiny, coarsely and densely punctate, nearly glabrous, metasternal disc sparsely covered with fine, short setae, otherwise with fine adpressed setae; metacoxa glabrous, with a few longer and robust setae laterally. Abdominal sternites finely and densely punctate, punctures with short setae, each sternite with a transverse row of robust punctures each bearing a fine seta. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/ metacoxa: 1/ 1.35. Pygidium strongly convex, shiny, finely and moderately densely punctate, without smooth midline, with a fine adjacent setae in punctures and a numerous more robust setae on apex.

Legs moderately short and wide, shiny; femora with two longitudinal rows of setae, finely and sparsely punctate. Anterior margin of metafemur acute, anterior row of setae complete, without serrated line; posterior ventral margin smooth, weakly widened at ventral apex, dorsal posterior margin smooth, neither serrate, finely shortly setose. Metatibia moderately short and wide, widest at apex, ratio of width/ length: 1/ 2.6, sharply carinate dorsally, with two groups of spines, basal group at one third, apical group at three thirds of metatibial length; lateral face longitudinally convex, shiny, sparsely finely punctate; ventral margin finely serrate, with four equidistant fine setae; medial face smooth and glabrous; apex finely serrate, deeply concavely emarginate mesointeriorly near tarsal articulation, ventral apical margin complate, at same level as dorsal one and not trunctate. Tarsomeres dorsally finely densely punctate, glabrous, neither laterally nor dorsally carinate, moderately to robustly setose ventrally; metatarsomeres with a strongly serrated ridge ventrally and a smooth subventral longitudinal carina; first metatarsomere slightly shorter than following tarsomere and as long as dorsal tibial spur. Protibia short, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 58 A–C. Habitus: Fig. 58D .

Diagnosis. Maladera haba Ahrens, Fabrizi & Liu , sp. n. differs from all other Chinese Maladera species by the small body size, the shiny body surface, yellowish brown colouration, the dorsoapical process of phallobase (in combination with the previous three characters), the c-shaped phallobase (lateral view) as well as lacking a carina on the hypomeron.

Etymology. The name of the new species (noun in apposition) refers to the type locality, Haba ( China).

Variation. Length: 5.0– 5.5 mm, length of elytra: 3.6–3.7 mm, width: 2.8–3.2 mm. Female: eyes smaller than in male, ratio of diameter/interocular width: 0.6; antennal club little shorter remaining antennomeres combined; pygidium convex.

Distribution. See map ( Fig. 120 ) and Table 1.

Figures

FIGURE 58. A–D: Maladera haba Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. dajuensis Ahrens, Fabrizi & Liu, sp. n. (holotype). 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 120. Distribution of the Maladera haba group: Maladera dajuensis sp. n. and M. haba sp. n..