Oxyserica diversicornis ( Moser, 1915 ) 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 : 76-77

Oxyserica diversicornis ( Moser, 1915) new combination

Figs. 22E–H , 32

Microserica diversicornis Moser, 1915: 387 ; Ahrens 2006: 239, 2007: 25; Ahrens & Bezděk 2016: 298.

Type material examined. Syntypes: 1 Ô “Tchao Pin-io Chine / Microserica diversicornis Type Ô Mos” ( ZMHB), 1 ♀ “Tchao Pin-io Chine / Microserica diversicornis Type Ô Mos” ( ZMHB) .

Additional material examined. 3 ex. “ Yünnan China ” ( ZMHB) , 6 ex. “ Yun-nan sen” ( ZMHB) , 1 ex. “W. Yunnan Chao-chow-fu 23.8.- 21.9.1914 2300m. Hohe / Berghang mit viel Busch, gekaeschert Meil. S.” ( ZMHB) , 2 ex. “ Chine Kong-Tchéou R.P.Esquirol 1912“ ( MNHN) , 3 ex. “Museum Paris Haut Plateau Yunnanais Distr. de Yunnan-Fou 1850-2000 m, 25 Lat. Dr. Legendre 1915 / Houa Ting-Se, bord du lac 23 Mars 1914 “ ( MNHN) , 1 ex. “ China, W. Yunnan Baoshan env. 5-8.VI.1993 E. Jendek & O. Sausa leg.” ( CP) , 2 ex. “ China Yunnan Lijiang 8- 24.VI.1994 leg. B. Šiška & T. Spevár ” ( CP) , 1 ex. “ China VI.1990 Lijiang leg. Bocak ” ( CP) , 2 ex. “ China-Yunnan 22.5.-2.6. 100 km W Kunming Diaolin Nat. Res. 1993 E. Jendek & O. Sausa leg. [sic!]” ( NHMW) , 1 ex. “ China, Yunnan, 19.VII.1993 Dali, Hua Dian Ba 50 km N of Dali C. Holzschuh leg.” ( CP) , 1 Ô, 3 ♀♀ “ China: Yunnan above Dali , 2000-2200 m 4.-17.IV.1999 leg. W. Schawaller ” ( SMNS) , 1 ♀ “ China-Yünnan W Dali , 1900-2400 m 25°45‘N 100°06‘E 8.-11.VII.1996 Chr. Häuser leg.” ( SMNS) , 1 Ô “ China: Yunnan Tse-Kou , 2000m 28°02’N, 98°54’E 7.+ 8.6.2006 leg. Jiri Klir ” ( NMPC) , 1 ex. “ Yunnan-North 30km E Lijiang, N26°50’- E100°24’ 2500m, 4.6.2006 V. Major leg.” ( CP) , 1 ex. “S China, Yunnan prov., 18km SW Baoshan , 2100m, 16-19.v.2003 leg. S. Murzin ” ( CP) , 3 ex. “ China (N. Yunnan) Dali Bai Nat. Aut. Pref., 1km W Dali old town, creek valley at foothill of Diancang Shan , 2170m, 25°41,9’N / 100°08.4’E (ruderal place) 28.VIII/1.IX./ 3.IX.2003 Wrase [18]” ( ZFMK) , 1 ex. “ Yunnan 2000-2800 m 25.11N 100.24E Weibaoshan mts. W slope 25-28/6.92 Vit Kubáň leg.” ( CN) , 1 ex. “ China pr. Yunnan c. occ. Dali-Teiheqiao 12.6.1993 R. Cervenka lgt.” ( ZFMK) , 3 ÔÔ “ Micangshan , Hanzhong S. Shanxi, III-2004, leg. Ying ” ( ZFMK) , 1 Ô “ Baimianshan Yanling F-Hunugu, 1.X.2003, leg. Li et al.” ( ZFMK) , 1 Ô “ China, E Hubei, 7.-10. V. Dabie Shan, 31.1N 115.8E Wujiashan forest park Jaroslav Turna leg., 2004” ( ZFMK) , 12 ex. “ China, NE Jiangxi, 18.IV. Sanqingshan , 450-600m, 28°52’N, 118°04’E Jaroslav Turna leg., 2006” ( ZFMK) .

Uncertain identification (♀): 1 ex. “ China, W. Yunnan Diaolin 18.VI.1993 E. Jendek & O. Sausa leg.” ( CP) , 2 ex. “ Yunnan 1500-3200 m 26.07N 103.14E Dongchuan 28/6-3/7 Vit Kuban leg. 1994” ( CP) , 1 ex. „ China-Yunnan Dali / 30.5.94 / 2100-2500 m Paulus leg.” ( CP) , 1 ex. “ Yunnan, 20-23.vii.1996, 27°05’N, 100°13’E, 3400 m, Yulong mts. - Ganhaizi, Vit Kubáň leg.” ( CP) , 1 ex. (♀) “ Yunnan, 2300 m Jizu Mts. 18.-20 Jul. 1995 Bolm lgt.” ( CP) , 1 ex. (♀) “ China, Yunnan Lijiang 8.-24.VI.1994 leg. B. Šiška & T. Spevár ” ( CP) , 1 ex. (♀) „C-China, Shaanxi, Quinling Shan , 6km N of Foping, 1150-1300m, 20-21.VI. leg. C. Holzschuh 2000” ( CP) , 1 ex. (♀) “ China, 1000-1300m, Shaanxi, Quinling mts., Xunyangba (6km E) 23.5.- 13.vi.1998 J.H. Marshal leg.” ( CP) , 1 ex. (♀) “ China, N. Yunnan, env. Xiaguan , 2400m, 29.vii.2002, leg. S. Murzin, J. Shokhin ” ( CP) , 1 ex. “ Kiautschou China ” ( ZMHB) .

Redescription. Length: 5.2 mm, length of elytra: 3.4 mm, width: 3.1 mm. Body oval, black, legs brown, elytra reddish brown with margins and one transversal mesolateral and one anteromedial spot black, dorsal surface dull and nearly glabrous.

Labroclypeus transversal, wider than long, shiny, widest at base, lateral margins in basal half almost straight, anteriorly strongly convex and convergent to rounded anterior angles; anterior margin distinctly emarginate medially, margins weakly reflexed; lateral margins and ocular canthus produce a blunt angle; surface flat, coarsely and densely punctate, with numerous long, erect setae; frontoclypeal suture finely incised and curved medially. Frons dull, anteriorly narrowly shiny, with dense, fine punctures, beside eyes and behind frontoclypeal suture with numerous long setae, otherwise with minute setae in punctures. Smooth area in front of eyes convex, as wide as long. Ocular canthus finely densely punctate, wide and moderately long (1/3 of ocular diameter), with two terminal setae. Eyes very small, ratio of diameter/interocular width: 0.39. Antenna with ten antennomeres; club composed of four antennomeres, straight, 1.2 times as long as than remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

Pronotum moderately wide, widest at base, lateral margins in basal half subparallel, anteriorly convex and convergent towards sharp and produced anterior angles; posterior angles blunt. Anterior margin of pronotum moderately convex, with fine but medially widely interrupted marginal line; basal marginal line absent; surface finely and densely punctate, glabrous, with minute setae in punctures; setae of lateral and anterior margins dense, extending on the disc around anterior angles. Hypomeron carinate, weakly produced ventrally. Scutellum triangular, finely and densely punctate, on base along middle narrowly impunctate.

Elytra elongate, widest at posterior third, striae weakly impressed, finely and densely punctate; sutural interval and lateral 2–3 intervals black, with a continuous black dot at anterior quarter from interval 2 to 4, and on posterior elytra between interval 4 to 7; intervals weakly convex, with fine and sparse punctures, with minute setae in punctures, penultimate lateral interval with a few short setae; epipleural edge fine, ending at rounded external apical angle of elytra, epipleura sparsely setose; apical border narrowly membranous, with a fine rim of short microtrichomes (magnification 100x).

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: 1/1.77. Abdominal sternites finely punctate, with a transverse row of coarse punctures, each bearing a robust seta. Pygidium strongly convex and dull, with dense, coarse punctures but without smooth midline, in punctures with numerous minute setae, with a few longer setae along apical margin.

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; posterior margin smooth ventrally, widened in apical half, posterior margin smooth dorsally, with a few short setae basally. Metatibia moderately long and wide, widest at middle, ratio of width/length: 1/2.94; dorsal margin sharply carinate, with two groups of spines, basal group at shortly before middle, apical one at three quarters of metatibial length, in basal third without further robust setae; lateral face longitudinally convex, finely and sparsely punctate, with minute setae in punctures; ventral edge finely serrate, with three robust equidistant setae; medial face smooth, apex interiorly near tarsal articulation shallowly concavely 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 little shorter than following two tarsomeres combined, little longer than dorsal tibial spur. Protibia short, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 22E–G . Habitus: 22H.

Figures

FIGURE 22. A–D: Oxyserica nigropicta (Fairmaire, 1891) (Chang Yang near Ichang); E–H: O. diversicornis Moser, 1915 (Yunnan: Ganhaizi). 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 32. Distribution of the Oxyserica marginata group (excluding the Himalayan Oxyserica species, shown in Ahrens & Fabrizi 2016) and of Microserica (sensu lato) species.