Serica (T.) kuankuoshuiensis Ahrens, Fabrizi & Liu, 2022

Ahrens, Dirk, Fabrizi, Silvia, Bai, Ming & Liu, Wangang, 2022, Taxonomic revision of Serica MacLeay, 1819 (sensu lato) from China and adjacent areas (Coleoptera: Scarabaeidae: Melolonthinae: Sericini), with updates on Nipponoserica Nomura, 1972, Zootaxa 5186 (1), pp. 1-83 : 61-63

Serica (T.) kuankuoshuiensis Ahrens, Fabrizi & Liu , new species

Figures 16A–D , 25

Type material examined. Holotype: ♂ “ Guizhou Kuankuoshui Nature Reserve, Tea Farm , 2010-VIII-10, 1527m, N:28.22; E: 107.15/ LW-1365” ( ZFMK) . Paratypes: 2 ♂♂ “ Pingbaying, Xianfeng , Hubei, 22.VII.1999, leg. Zheng Leyi ” ( NKU) , 1 ♂ “ Mt. Fanjingshan , Guizhou, 27.VII.2001, 1300m, leg. Zhao Fang / LW-956” ( CAU) , 1 ♂ “ Leigongshan Forestry Farm , Guizhou, 14.IX.2005, leg. Wang Jiliang, Gaochao/ LW-087” ( HBUM) .

# Species from Taiwan not included here.

Description of the holotype. Length: 8.6 mm, length of elytra: 6.5 mm, width: 5.0 mm. Body oval, dark brown, dull, partly with greenish toment, ventral surface and legs reddish brown, elytra yellow brown with numerous dark spots, in punctures lighter, antenna yellow; dorsal surface almost glabrous except some single and short, white adpressed setae on pronotum and elytra.

Labroclypeus subtrapezoidal, little wider than long, widest at base, lateral margins weakly convex and convergent anteriorly, preapically abruptly angled; anterior angles blunt; anterior margin deeply emarginate medially; margins moderately reflexed; surface flat and moderately shiny, finely and densely punctate, partly punctures fusing to transverse wrinkles, with numerous erect setae; frontoclypeal suture finely incised, weakly bent medially; smooth area anterior to eye small and convex, 1.5 times as wide as long; ocular canthus short and slender (1/4 of ocular diameter), impunctate, with a short terminal seta. Frons completely dull and flat, with fine and dense punctures, with numerous fine and short, erect setae. Eyes small, ratio diameter/ interocular width: 0.57. Antenna with 10 antennomeres; club with three antennomeres, as long as remaining antennomeres combined and straight. Mentum strongly elevated anteriorly, flattened anteriorly. Labrum strongly produced along middle, narrowly but deeply emarginate medially.

Pronotum narrow and subtrapezoidal, widest at base, lateral margins evenly and weakly convex and convergent anteriorly; anterior angles well produced and sharp, weakly rounded in the tip; posterior angles weakly rounded; anterior margin straight, with robust and complete marginal line; surface irregularly, partly densely and partly sparsely punctate, sparse punctures finer, along midline narrowly impunctate, with short or minute, white, adpressed setae; lateral margins sparsely setose; hypomeron carinate at base, moderately produced ventrally. Scutellum large, triangular, finely and densely punctate, with minute setae in punctures, on midline punctures less dense.

Elytra oval, widest at posterior third, striae finely impressed, finely and densely punctate; intervals flat, with fine, sparse punctures; with a few single, fine, short, white, adpressed setae on all intervals; epipleural edge fine, ending at moderately curved external apical angle of elytra, epipleura densely setose; apical margin narrowly membraneous, with a fine rime of minute microtrichomes (magnification 100x) (left elytra of holotype broken at middle, apical portion missing).

Ventral surface dull, finely and densely punctate, sparsely setose, widely glabrous; metacoxa glabrous, except a few short lateral setae. Mesosternum between mesocoxae half as wide as the slender mesofemur. Ratio of length of metepisternum/ metacoxa: 1/ 1.49. Abdominal sternites with a transverse row of coarse punctures, each bearing a long seta, otherwise glabrous; penultimate sternite at posterior margin with a wide membraneous rim being one third as long as sternite. Pygidium moderately convex and dull, dark, in punctures yellow, finely and densely punctate, smooth midline narrow, with sparse, moderately long setae.

Legs slender, shiny, pro- and mesofemur dull; femora with two longitudinal rows of setae, finely and sparsely punctate between the rows. Metafemur shiny, anterior margin acute, without a continuously serrated line behind anterior edge; ventral posterior margin serrated and only weakly widened at apex, dorsal posterior margin completely serrated, in basal half with a few long setae which are half as long as metafemur width. Metatibia slender and long, widest shortly before apex, ratio of width/ length: 1/3.8, dorsally sharply carinate, with two groups of spines, basal group at one third, apical group at two thirds of metatibial length, basally with a few single, robust setae; external face sparsely and finely punctate, with some superficial longitudinal wrinkles; ventral margin serrated, with two widely separated robust setae; medial face finely sparsely punctate, glabrous; apex interiorly near tarsal articulation bluntly truncate. Tarsomeres ventrally with sparse, minute setae, dorsally smooth. Metatarsomeres ventrally glabrous, laterally and dorsally carinate, with a strongly serrated ridge ventrally; first metatarsomere little shorter than following two tarsomeres combined and little longer than dorsal tibial spur. Protibia moderately long, bidentate, external margin smooth but bluntly extended at middle; anterior claws asymmetrical, basal tooth of inner claw widened and sharply pointed at apex.

Aedeagus: Fig. 16A–C . Habitus: Fig. 16D . Female unknown.

Diagnosis. Serica kuankuoshuiensis Ahrens, Fabrizi & Liu , new species resembles somewhat Serica silviae Ahrens, 2009 , both species share the sclerotized and spinose endophallus which is visible between parameres. Both species differ significantly in the shape of parameres, in Serica kuankuoshuiensis the dorsal lobe of the left paramere is massive and the ventral lobe only filiform and small.

Etymology. The species is named (adjective in singular nominative case) after its type locality, Kuankuoshui Nature Reserve.

Variation. Length: 8.4–8.6 mm, length of elytra: 6.5–6.6 mm, width: 5.0– 5.8 mm.

Figures

FIGURE 16. A–D: Serica kuankuoshuiensis Ahrens, Fabrizi & Liu, new species (holotype); E–H: S. limbourgi Ahrens, Fabrizi & Liu, new species (holotype). A, E: Aedeagus, left side lateral view; C, G: Aedeagus, right side lateral view; B, F: Parameres, dorsal view; D, H: Habitus (not to scale). Scale: 0.5 mm.

FIGURE 25. Distribution of Nipponoserica daqiao Ahrens, Fabrizi & Liu, new species, Serica hailougou Ahrens, Fabrizi & Liu, new species, S. huangjing Ahrens, Fabrizi & Liu, new species, S. kuankuoshuiensis Ahrens, Fabrizi & Liu, new species, S. limbourgi Ahrens, Fabrizi & Liu, new species, S. paralongipes Ahrens, Fabrizi & Liu, new species, S. pseudogracilipes Ahrens, Fabrizi & Liu, new species, S. smetanai Ahrens, Fabrizi & Liu, new species, S. taishun Ahrens, Fabrizi & Liu, new species, S. tianpingshanensis Ahrens, Fabrizi & Liu, new species.