Gastroserica hiulca ( Brenske, 1897 ) Ahrens & Liu & Lukic & Bai, 2023

Ahrens, Dirk, Liu, Wangang, Lukic, Daniel & Bai, Ming, 2023, A taxonomic review of Microserica Brenske, 1894 from continental Asia (Coleoptera: Scarabaeidae: Melolonthinae: Sericini), Zootaxa 5241 (1), pp. 1-115 : 15-16

Gastroserica hiulca ( Brenske, 1897) new combination

Figs. 3E–H , 24

Microserica hiulca Brenske, 1897: 419 ; Ahrens 2006a: 238; 2007b: 25; Ahrens & Bezděk 2016: 298.

Type material examined. Lectotype (here designated): Ô “N China Donkier V. / Microserica hiulca Typ. Brsk. / coll. Brenske ” ( ZMHB).

Additional material examined. China: 1 ex. “ Museum Paris Kouy-Tcheou Reg. de Pin-Fa, Pere Cavalerie 1908” ( MNHN) , 3 ex. “ China: Kiangsi Hong Shan , 840 m 30.VI.1936 / L. & M. Gressitt Collectors Bishop Mus. ” ( BPBM) , 1 ex. “ So. Kiangsi Prov., S.China SE Corner Hong shan, Alt. 950 meters. June 30, 1936 J. Linsley Gressitt ” ( BPBM) , 1 ex. “Kiangsi, SE. China Hong Shan. 1000 m VI-25-36. Gressitt” ( BPBM) , 8 ex. “ China Jiangxi W Jinggang Shan Ciping env. 2.-14.VI.1994 ” ( NHMW) , 2 ex. “ China: Hunan; Mupu Mt. 1600 m, Pingjiang VII-2003, leg. Li et al.” ( ZFMK) , 12 ex. “ China: S- Hubei Mupushan, Tongshan vi.2004 leg. Wen ” ( ZFMK) , 4 ex. “ China: Hunan prov., Zhang Jia Jie 15.vi.1992; C. Holzschuh leg.” ( CP) , 3 ex. “CH, Guizhou prov., Leigong Shan (E slope), 14-24.vi.2001, Leishan->Fangxiang (pass), 26°22.74’N 108°12.99’E, ~ 1700m, C. Holzschuh leg.” ( CP) , 3 ex. “China, W Hubei, 12.-13.VII. Muyuping S env. 31,45N 110,4E, ~ 1300m Jaroslav Turna leg., 2003” ( ZFMK) , 1 Ô “China, W Jiangxi Jinggang Shan-Ciping 2-14.VI.1994 E. Jendek & O. Sausa leg. / CS78” ( CP) , 2 ÔÔ, 1 ♀ [ China ] “Longmenhe, Xingshan, Hubei, 14, 16.VII.1993, 1350m, leg. Yang Xingke, Sun Baowen / LW-387” ( IZAS) , 1 Ô, 1 ♀ [ China ] “Mts. Leigongshan, Guizhou, 13.VII.1983, 1300-1400m, leg. Zou ” ( NKU) , 1 Ô [ China ] “Baiyan, Longsheng, Guangxi, 23.VI.1963, 1150m, leg. Wang Shuyong ” ( IZAS) . Vietnam: 2 ex. (Ô) “ Tonkin Montes Mauson April , Mai 2-3000’ [feet] H. Fruhstorfer ” ( ZMHB, MNHN) .

Redescription. Length: 5.4 mm, length of elytra: 3.6 mm, width: 3.4 mm. Body oval, body yellowish brown, head, center of pronotum, and ventral surface including abdomen and most parts of pygidium darker brown, dorsal surface iridescent shiny or sometimes dull and nearly glabrous.

Labroclypeus elliptical, slightly wider than long, widest shortly before base, lateral margins strongly convex and convergent to strongly rounded anterior angles; anterior margin emarginate medially, margins weakly reflexed; lateral margins and ocular canthus produce a blunt angle; surface shiny, medially almost flat, finely and coarsely, densely punctate, with numerous long, erect setae; frontoclypeal suture finely incised and curved medially. Frons dull, with sparse, coarse punctures, beside eyes and behind frontoclypeal suture with a few single short setae, otherwise with minute setae in punctures. Smooth area in front of eyes twice as wide as long. Ocular canthus sparsely finely punctate, narrow and moderately long (1/3 of ocular width), with a terminal seta. Eyes small, ratio of diameter/interocular width: 0.47. Antenna with ten antennomeres; club composed of four antennomeres, straight, 1.2 times as long as remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

Pronotum widest at base, lateral margins evenly convex and convergent to blunt but distinctly produced anterior angles, posterior angles strongly rounded. Anterior margin of pronotum weakly convex, with fine and complete marginal line; basal marginal line absent; surface finely and densely punctate, with minute setae in punctures, anterior and lateral anterior margins sparsely setose. Hypomeron carinate, weakly produced ventrally. Scutellum triangular, finely and densely punctate, on midline narrowly impunctate.

Elytra short, widest at middle, striae distinctly impressed, finely and densely punctate, intervals convex, with fine and sparse punctures concentrated along striae, with very minute setae in punctures, odd intervals with a few short setae; epipleural edge robust, ending at slightly rounded external apical angle of elytra, epipleura densely setose, apical border chitinous, without a fringe of short microtrichomes (visible at ca 100x magnification).

Ventral surface dull, finely and densely punctate, metasternum sparsely covered with fine, short, or very minute setae; metacoxa glabrous, with a few single setae laterally. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.76. Abdominal sternites finely punctate, with a transverse row of coarse punctures, each bearing a robust seta. Pygidium strongly convex and dull, with mixed finer and larger punctures, without smooth midline, with numerous short setae and a few longer in the larger punctures.

Legs moderately wide; femora finely and sparsely punctate, with two longitudinal rows of longer setae. Metafemur moderately shiny, anterior margin acute, without submarginal serrated line; anterior row of seta-bearing punctures present; ventral posterior margin finely serrate at apex, only weakly widened in apical half, dorsal posterior margin serrate, with a few short setae basally. Metatibia moderately long and wide, widest at middle, ratio width/length: 1/2.9; dorsal margin weakly carinate, with two groups of spines, basal group at middle, apical one at three quarter of metatibial length, in basal third with a few robust single setae; lateral face longitudinally convex, finely and very sparsely punctate, along midline smooth, with minute setae in punctures; ventral edge finely serrate, with three robust equidistant setae; medial face smooth, apex interiorly near tarsal articulation sharply truncate. Tarsomeres with fine, sparse setae ventrally, neither laterally nor dorsally carinate, dorsally smooth; metatarsomeres glabrous, with a strongly serrated ridge ventrally and a parallel subventral smooth carina immediately beside it; first metatarsomere as long as following two tarsomeres combined, almost twice as long as dorsal tibial spur. Protibia short, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 3E–G . Habitus: Fig. 3H .

Figures

FIGURE 3. A–D: Gastroserica simaoensis Ahrens, Lukic & Liu, new species (holotype); E–H: G. hiulca (Brenske, 1897) (China: W Jiangxi: Ciping). 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 24. Distribution of the genus Gastroserica (Helioserica Ahrens, Lukic & Liu, new subgenus), part 1.