Gastroserica lucidomarginalis Ahrens, Lukic

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 : 22-23

Gastroserica lucidomarginalis Ahrens, Lukic & Liu, new species

Figs. 6E–I , 25

Type material examined. Holotype Ô “836957 / 836957 Laos Xieng Khouang , Phonsavan (30 km NE), Phou Sane Mt. 1400-1600m 10.-30.2009 V. Kuban Microserica spLA2 / 43 Asia Sericini spec.” ( ZFMK) . Paratypes: Laos: 1 Ô “LAOS north 24.-30.V.1997 20 km NW Lounag Namtha , N21°09.2 E101°18.7, alt. 900+100m, E. Jendek & O. Šauša leg.” ( CP) , 6 ÔÔ “LAOS, Xieng Khouang prov., 19°37–8’N, 103°20’E, Phonsavan (30 km NE) Phou Sane Mt. , 1420 m, 10-30.v.2009, Z. Kraus leg. / NHMB Basel, NMPC Prague, Laos 2009, Expedition: M. Brancucci, M. Geiser, Z. Kraus, D. Hauck, V. Kubáň ” ( NHMB) , 2 ÔÔ “LAOS, Xieng Khouang prov., 19°37–8’N, 103°20’E, Phonsavan (30 km NE) Phou Sane Mt. , 1300-1500m 10-30.v.2009, M. Brancucci leg. / NHMB Basel, NMPC Prague, Laos 2009, Expedition: M. Brancucci, M. Geiser, Z. Kraus, D. Hauck, V. Kubáň ” ( NHMB) , 5 ÔÔ “LAOS, Xieng Khouang prov., 19°37–8’N, 103°20’E, 30 km NE Phonsavan: Ban Na Lam -> Phou Sane Mt. , 1300-1700m, 10-30.v.2009, M. Geiser leg. / NHMB Basel, NMPC Prague, Laos 2009, Expedition: M. Brancucci, M. Geiser, Z. Kraus, D. Hauck, V. Kubáň ” ( NHMB) , 1 Ô “LAOS, Hua Phan prov., 20°13’N, 104°00’E, Phou Pane Mt. , 1- 16.vi.2009, 1350-1500 m, M. Brancucci leg. / NHMB Basel, NMPC Prague, Laos 2009, Expedition: M. Brancucci, M. Geiser, Z. Kraus, D. Hauck, V. Kubáň ” ( NHMB) , 18 ÔÔ “LAOS, Xieng Khoang prov., 19°37-8’N 103°20-1’E, Phonsavan (30 km NE) Phou Pane Mt. , 1400-1700 m, 10.-30.v.2009, D. Hauck leg./ NHMB Basel, NMPC Prague, Laos 2009, Expedition: M. Brancucci, M. Geiser, Z. Kraus, D. Hauck, V. Kubáň ” ( NHMB) , 1 Ô “ Laos: Luang Namtha Distr. Lak Kham Mai, Muang Sing , 5- 9.5.2007, M. Pejcha ” ( NME) , 11 ÔÔ “NE-Laos: Hua Phan prov., Ban Saleui, Phou Pan ( Mt. ) - 20°12’N, 104°01’E; 14.iv.-15.v.2012; 1300-1900m; leg. C. Holzschuh Ankauf ZFMK Bonn 2012/13” ( ZFMK) , 2 ÔÔ “NE-Laos: Hua Phan prov., Ban Saleui, Phou Pan ( Mt. ) - 20°12’N, 104°01’E; 1300- 1900m; 01.-31.v.2011; leg. C. Holzschuh Ankauf ZFMK Bonn 2011” ( ZFMK) , 16 ÔÔ “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” ( ZFMK) , 1 Ô “Laos-NE Hua Phan prov. 20°12’N, 104°01’E Phou Phan Mt. , 1900m 17.5.- 3.6.2007, leg. C. Holzschuh ” ( ZFMK) , 1 Ô “LAOS, Attapeau prov. Annam Highlands Mts Dong Amphan; NBCA ca 1160m Nong Fa (crater lake) env.; 15°05.9’N, 107°25.6’E St. Jakl lgt. 30.4.- 6.5.2010 ” ( ZFMK) . China: 1 Ô “ China: SYunnan (Xishuangbanna) 23km NW Jinghong vic. Na Ban ( NNNR) / N21 °09.49’, E100°39.92 20.V.2008, leg. A. Weigel, 730m Waldrand KF” ( NME) , 1 ♀ “ China: S-Yunnan (Xishuangbanna) 20km NW Jinghong vic. Man Dian ( NNNR) / N22 °07.80’, E100°40.05 730m 28.VI.2008, GS leg. A. Weigel, forest” ( NME) , 1 Ô [ China ] “Mandian (Forest), Nabanhe Nature Reserve, Jinghong, Xishuangbannna, Yunnan, 16.V.2009, 753m, leg. Meng LZ / LW-401” ( IZAS) , 1 Ô [ China ] “Mt. Pinglongshan, Shangsi, Guangxi, 6.IV.2002, leg. Shi Aimin / LW-397” ( HBUM) , 1 Ô, 2 ♀♀ [ China ] “Mengla, Xishuangbanna, Yunnan, 10.VI.1959, 620-650m, leg. Pu Fuji, Zhang Facai ” ( IZAS) , 1 ♀ [ China ] “Shuiman, Hainan, Guangdong, 26.V.1960, 1879m, leg. Li Suofu ” ( IZAS) . Vietnam: 3 ÔÔ “N-Vietnam Cao Bang Prov., vic. Vin Den, Nui Pia Oac Nat. Res. 06.-10.V.2013, 22°33’53’’N, 105°52’53’’E 900-1300m A. Skale ” ( ZFMK, NME) , 1 Ô “N-Vietnam Cao Bang Prov., vic. Vin Den, Nui Pia Oac Nature Res. , 6.-10.V.2013 22°33’53’’N, 105°52’53’’E 900-1300m leg. A. Weigel ” ( NME) , 2 ÔÔ, 1 ♀ “N-Vietnam Cao Bang Prov., vic. Vin Den, Nui Pia Oac Nat. Res. 10.-15.V.2014, 22°33’53’’N, 105°52’53’’E 900-1300m A. Skale ” ( ZFMK, NME) , 1 Ô “N-Vietnam Cao Bang Prov., vic. Tinh Tuc, Son Dong, Nui Piac Oac Nature Reserve , 9.-15.V.2014, 22°37’55’’N 105°52’98’’E 850-1300m leg. A. Skale ” ( NME) .

Description of holotype. Length: 4.9 mm, length of elytra: 3.4 mm, width: 3.1 mm. Body oval, body dark brown to blackish, pronotum, center of elytra and pygidium, legs and antenna yellow, margins of elytra and frons dark, dorsal surface shiny, nearly glabrous.

Labroclypeus narrow and almost semicircular, as wide as long, widest at base, lateral margins strongly convex and convergent to strongly rounded, almost obsolete anterior angles; anterior margin weakly incised medially, margins weakly reflexed; lateral margins and ocular canthus produce a blunt angle; surface medially weakly convexly elevated, finely and coarsely, densely punctate, with numerous long, erect setae; frontoclypeal suture finely incised and curved medially. Frons shiny, with moderately dense, fine 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 moderately large, ratio of diameter/interocular width: 0.6. Antenna with ten antennomeres; club composed of four antennomeres, weakly reflexed, 1.6 times as long as remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

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

Elytra short, widest at middle, striae finely impressed, finely and densely punctate, intervals flat, 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 shiny, 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: 1/1.53. Abdominal sternites finely punctate, with a transverse row of coarse punctures, each bearing a robust seta. Pygidium strongly convex and shiny, with mixed sparse, finer and dense, larger, partly longitudinally rugose 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:1/3.64; dorsal margin sharply 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 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 impunctate; metatarsomeres in holotype missing. Protibia short, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 6E–H . Habitus: Fig. 6I .

Diagnosis. Gastroserica lucidomarginalis Ahrens, Lukic & Liu, new species is in external appearance and shape of aedeagus similar to Gastroserica ivoi Ahrens, Lukic & Liu, new species Gastroserica lucidomarginalis Ahrens, Lukic & Liu, new species differs by shorter antennal club in male, and by the shape of aedeagus: the ventral lamina of phallobase is more pronounced (lateral view); the basal lobe of the left paramere is distally much longer being almost subequal to the distal lobe of the paramere; the right paramere is preapically more strongly narrowed.

Etymology. The name of the new species is derived from the combined Latin words “ lucidus ” (shiny) and “ marginalis ” (bordered) (adjective in singular nominative), with reference to the shiny surface and the dark elytral margin.

Variation. Length: 4.9–5.6mm, length of elytra: 3.4–3.5 mm, width: 3.1–3.2 mm. 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 and twice as long as dorsal tibial spur. The species has an entire dark (black, iridescent shiny) and yellow form with dark elytral margins (holotype). Female: completely yellow, antennal club short, composed of three antennomeres; pygidium flat.

Genbank accessions. Table 1 .

Figures

FIGURE 6. A–D: Gastroserica ivoi Ahrens, Lukic & Liu, new species (holotype); E–I: G. lucidomarginalis Ahrens, Lukic & Liu, new species (holotype); J–M: M. loei Ahrens, Lukic & Liu, new species. A, E, J: Aedeagus, left side lateral view; C, H, L: Aedeagus, right side lateral view; B, F, G, K: Parameres, dorsal view; D, I, M: Habitus (not to scale). Scale: 0.5 mm.

FIGURE 25. Distribution of the genus Gastroserica (Helioserica Ahrens, Lukic & Liu, new subgenus), part 2.