Maladera filigraniforceps 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 : 226-227

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

Figures 52 A–D, 116

Type material examined. Holotype: ♂ “Kuatun (2300m) 27,40n.Br. 117,40.ö. L. J. Klapperich 7.6.1938 (Fukien)/ 824 Sericini : Asia spec.” ( ZFMK) . Paratypes: China: 1 ♂ “Fukien, S. China Shaowu : Tachulan 1000m. T. Maa / 5.VI.42” ( BMH) , 1 ♂ “ China, W Fujian, 3.-4.VI. Emei Feng , 1200-1500m 27°01’N 117°04’E Jaroslav Turna leg., 2008” ( ZFMK) , 3 ♂♂, 1 ♀ “ China: Fujian; Tongguzhang 1600m, Jianling vii-2004 / Phil 11-2004-2” ( ZFMK) , 4 ♂♂ “[China] Jiugongshan Tongshan, S-Hubei, 1.V.2004, Leg Wen ” ( ZFMK), 1 ♂ “ China , Guangdong prov. W of Qixing, 1.-3.v.2011 Heishiding (stream; pools) (forested stream valley; at light) 23°27.9’N, 111°54,3’E, 190m M. Fikáček & J. Hájek leg.” ( NMPC), 1 ♂ “[China] Huangjing, Luzhou, Sichuan, 16.VII.2002, leg. Bai Ming, Wang Jianfeng ” ( HBUM), 1 ♂ “[China] Guadun, Mt. Wuyishan , Fujian, 22-23.V.2004, leg. Yuan Caixia, Lijing ” ( HBUM). Vietnam: 1 ♂ “ Vietnam N (Sa Pa) Lao Cai Prov., 250km from Hanoi bearing 31°, Sa Pa vill. env. Hoang Lien Son Nat. Res. 9.- 15.6.1998 1250m, leg. A. Napolov ” (Coll. Napolov, Riga), 1 ♂ “ Vietnam N ( Sa Pa ) Lao Cai Prov., 250km from Hanoi bearing 31°, Sa Pa vill. env. Hoang Lien Son Nat. Res. 27.V.-3.VI.1998 1250m leg. A. Napolov ” ( CNA), 1 ♂ “N Vietnam (Tonkin) pr. Vinh Phu 1990 Tam Dao 6.-9. V. P. Pacholatko leg./ VS88” ( CP) , 2 ♂♂ “N-Vietnam Vinh Phuc Prov., vic. Tam Dao town, Tam Dao NP, 02.-5.V.2013, 21°27’N 105°38’E, 700- 1000m, A. Skale ” ( CASH). Laos: 2 ♂♂ “Laos-NE, Huoa Phan prov., 20°13’09-19’’N 103°59’54’’- 104°00’03’’E, 1480-1510m, Phou Pane Mt. , 22.iv.-14.v.2008, Vit Kuban leg.” ( ZFMK) , 1 ♂ “NE-Laos: Hua Phan prov., Ban Saleui, Phou Pan ( Mt. ) - 20°12’N, 104°01’E; 11.iv.-15.v.2012; 1300-1900m; leg. C. Holzschuh Ankauf ZFMK Bonn 2012/13” ( ZFMK) , 1 ♂ “ Laos: NE; Hua Phan prov. Ban Saluei; Phu Phan Mt. , 20°15’N 104°02’E; 1500-2000m; D. Hauck leg.; 26.iv.-11.v.2001 ” ( CP) .

Description. Length: 10.5 mm, length of elytra: 7.0 mm, width: 6.0 mm. Body oblong, reddish brown, antenna yellow, dorsal surface shiny, almost glabrous.

Labroclypeus subrectangular, widest at base, lateral margins straight and weakly convergent to strgonyl convex anterior angles, lateral border and ocular canthus produce a distinctly blunt angle, anterior margin widely emarginate medially, margins weakly reflexed; surface flat and shiny, finely and moderately densely punctate, with numerous coarse punctures in anterior half bearing fine and erect setae; frontoclypeal suture indistinctly incised and medially weakly angled; smooth area in front of eye small, 1.5 times as wide as long; ocular canthus moderately long and slender (1/3 of ocular diameter), densely finely punctate, with two terminal setae. Frons with fine, sparsely scattered punctures, with a few setae beside eyes and behind frontoclypeal suture. Eyes moderately small, ratio of diameter/ interocular width: 0.58. Antenna yellow, with ten antennomeres; club with three segments, as long as remaining segments together. Mentum elevated, anteriorly flattened and glabrous.

Pronotum moderately wide, widest at base, lateral margins in basal half straight and weakly convergent anteriorly, in anterior half convex and moderately convergent, anterior angles strongly produced and sharp, posterior angles sharp; anterior margin weakly produced medially, base without marginal line; surface finely and densely punctate, glabrous; anterior and lateral border sparsely setose. Scutellum wide, triangular, with fine and dense punctures, glabrous.

Elytra moderately oblong, widest behind middle, striae moderately impressed, finely and densely punctate, intervals moderately convex, with fine and sparsely punctures concentrated along striae, a few punctures on odd intervals with sparse fine, erect setae; epipleural margin robust, ending at strongly curved external apical angle of elytra; epipleura sparsely setose, apical border membraneous, covered with very short microtrichomes.

Ventral surface shiny, coarsely and densely punctate, almost glabrous, metacoxal plates laterally with a few long setae; each abdominal sternite with a transversal row of coarse punctures bearing short and fine setae between fine and dense punctation, penultimate sternite apically with a shiny smooth chitinous border, which is a quarter as long as sternite. Mesosternum between mesocoxae a little less wide than mesofemur. Ratio of length of metepisternum/ metacoxa: 1/ 1.4. Pygidium strongly convex, finely and moderately densely punctate, without smooth midline, surface shiny, with numerous fine and long setae at apex; apical margin medially not emarginate.

Legs moderately slender; femora shiny, with two longitudinal rows of setae, between the rows only sparsely punctate; anterior margin of metafemur sharply carinate, adjacent to anterior margin without serrated line; posterior margin ventrally in apical half finely serrated, little widened at apex, completely serrated dorsally, in basal half with a few fine setae. Metatibia moderately slender and moderately long, widest at apex, ratio width/ length: 1/ 3.2; dorsal margin moderately carinate, with two groups of spines, basal one shortly before middle, apical one at three quarters of metatibial length, basally with two single setae with punctures having a serrated margin; lateral face longitudinally convex, with moderately dense, superficial and partly longitudinally impressed punctures, glabrous; ventral margin with three robust spines of which the apical two are more distant; internal face sparsely, finely punctate, apex shallowly emarginate interiorly near tarsal articulation. Tarsomeres distinctly and densely punctate dorsally, ventrally with sparse, short setae; metatarsomeres ventrally with a strongly serrated ridge, beside it with an additional longitudinal margin, glabrous, laterally moderately carinate, dorsally with longitudinal wrinkles; first metatarsomere as long as following two tarsomeres combined and about one third longer than dorsal tibial spur. Protibiamoderately long, bidentate; protarsal claws missing in holotype.

Aedeagus: Fig. 52 A–C. Habitus: Fig. 52D .

Diagnosis. Maladera filigraniforceps Ahrens, Fabrizi & Liu , sp. n. differs from the other unicolored, reddish brown species of the M. brunnescens group in having the phallobase weakly widened apically and the parameres composed of two filiform branches.

Etymology. The name of the new species (adjective in the nominative singular) is derived from the combined Latin word ‘ filigranus ’ (narrow) and ‘ forceps ’ (pins), with reference to the long, filigranous shape of the parameres.

Variation. Length: 8.9–10.6 mm, length of elytra: 6.9–7.5 mm, width: 5.8–6.2 mm. Protarsal claws symmetric. Female: eyes smaller than in male, ratio of diameter/interocular width: 0.49; antennal club with three antennomeres, distinctly shorter than remaining antennomeres combined; pygidium weakly convex.

Distribution. See map ( Fig. 116 ) and Table 1.

Figures

FIGURE 52. A–D: Maladera filigraniforceps Ahrens, Fabrizi & Liu, sp. n. (holotype); E–H: M. flavipennis Ahrens, Fabrizi & Liu, sp. n. (holotype); I–L: M. liwenzhui 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 116. Distribution of the Maladera brunnescens group: Maladera brunnescens (Frey, 1972), M. filigraniforceps sp. n., M. flavipennis sp. n., M. parabrunnescens sp. n..