Maladera panyuensis 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 : 327-328

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

Figures 78 A–D, 130

Type material examined. Holotype: ♂ “[ China ] Canton , South China , Honam Island, Pan-yu District, 12.III.1948 ” ( LSSYU) . Paratypes: China: 1 ♂ “[China] Guilin , Guangxi, 19.III.1952 ” ( IZAS) , 1 ♂ “[China] Liangfeng , Guilin, Guangxi, 28.IV.1952 ” ( IZAS) , 1 ♂ “[China] Liangfeng, Guilin , Guangxi, 25.VI.1952 ” ( IZAS) , 1 ♂ “[China] Jingdong , Yunnan, 9.V.1957, 1200m, leg. Monschadski ” ( IZAS) , 1 ♂ “[China] Mts. Yanshan, Guilin , Guangxi, 17.V.1953 ” ( IZAS) , 1 ♂ “ Hainan, S. China, No-doa, Tan-hsien ( District ), 18-22.III.1935, 2200m, leg. F. K. To ” ( LSSYU) , 1 ♂ “[China] Mt. Yanshan, Guilin , Guangxi, 13.V. 1963, 200m, leg. Wang Chunguang ” ( IZAS) , 1 ♂ “Kiang-Si Chang-tsin-cheng” ( ZMHB) , 1 ♂ “ China 1942 Yun Hsien Apr. WL. Jellison” ( USNM) . Thailand: 1 ♂ “ Thailand bor. Hang Dong 6.1990. lgt. Wimmer” ( ZFMK) .

Description. Length: 7.3 mm, length of elytra: 5.4 mm, width: 4.2 mm. Body oval, dark reddish brown, antenna brown, labroclypeus shiny, remainder of dorsal surface dull, except a few small setae on head and elytra glabrous.

Labroclypeus subtrapezoidal, moderately wider than long, widest at base, lateral margins weakly convex and moderately convergent to moderately rounded anterior angles, lateral margin and ocular canthus producing a distinct blunt angle, margins strongly reflexed, anteriorly weakly emarginate medially; surface moderately convex medially, shiny, finely and densely punctate, distance between punctures less than their diameter, with few long, erect setae anteriorly; frontoclypeal suture slightly elevated and moderately bent medially; smooth area in front of eye approximately 3 times as wide as long; ocular canthus short and wide, finely densely punctate, with one terminal seta. Frons dull, with fine, dense punctures, glabrous except for a few setae beside eyes. Eyes large, ratio of diameter/interocular width: 0.7. Antenna with 10 antennomeres; club with three antennomeres, 1.2 times as long as remaining antennomeres combined. Mentum anteriorly elevated and flattened.

Pronotum subtrapezoidal, widest at base, lateral margins convex and strongly convergent anteriorly, anterior angles produced and moderately sharp, anterior margin convex, marginal line complete; surface finely and densely punctate, with very minute setae in the punctures only; anterior and lateral margins setose. Scutellum wide, triangular, with fine and dense punctures each bearing a minute seta.

Elytra oblong, widest at middle, striae well impressed, finely and densely punctate, intervals convex, with fine, dense punctures concentrated along striae, odd intervals with a few fine, erect, short setae, otherwise punctures with very minute setae; epipleural margin robust, ending at the strongly rounded external apical angle of elytra, epipleura densely setose, apical border membraneous, with a rim of short microtrichomes.

Ventral surface dull, metasternum and metacoxa with large and dense punctures, sparsely setose on metasternal disc: metacoxa glabrous except for a several long setae laterally; each abdominal sternite in addition to generally distributed fine and moderately dense punctures with a distinct transverse row of coarse punctures each bearing a short and robust seta, punctures with microscopic setae, penultimate sternite apically with a very narrow shiny chitinous border. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.47. Pygidium large but moderately convex, finely and moderately densely punctate, with smooth impunctate midline, punctures with microscopic setae, with a few long setae along apical margin.

Legs moderately wide and long; femora with two longitudinal rows of setae, finely and moderately densely punctate; metafemur dull, anterior margin acute, lacking an adjacent serrated line, posterior ventral margin medially straight, weakly widened in apical half and not serrate, dorsally not serrated, finely setose. Metatibia moderately wide and long, widest at apex, ratio width/length: 1/2.56, dorsally sharply carinate, with two groups of spines, basal one shortly before middle, apical one at two thirds of metatibial length, with a non-contiguous serrated line from base to the basal group of spines, beside it with a few punctures but without spines; lateral face longitudinally convex, shiny, with sparse and fine punctures on basal half, with minute setae in punctures; ventral margin serrate, with five equidistant spines; medial face not punctate, apex interiorly near tarsal articulation shallowly concave. Tarsomeres impunctate dorsally, ventrally with sparse, short setae; metatarsomeres ventrally with a strongly serrated ridge, subventral longitudinal carina absent; first metatarsomere slightly longer than following two tarsomeres combined and distinctly longer than dorsal tibial spur. Protibia moderately long, bidentate, claws of anterior tarsomeres symmetrical, feebly curved and long, with normally developed basal tooth.

Aedeagus: Fig. 78 A–C. Habitus: Fig. 78D . Female unknown.

Diagnosis. Maladera panyuensis Ahrens, Fabrizi & Liu , sp. n. resembles M. obscurata (Moser) in external appearance, but it is more elongate and larger. The new species can be distinguished further in having large basal lobes on the parameres.

Etymology. The new species is named after the type locality, Panyu (adjective in the nominative singular).

Variation. Length: 6.6–7.6 mm, length of elytra: 5.2–5.9 mm, width: 4.3–4.5 mm.

Distribution. See map ( Fig. 130 ) and Table 1.

Figures

FIGURE 78. A–D: Maladera panyuensis Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. lukjanovitschi (Medvedev, 1966) (China: Nei Mongol.: Erlian). 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.