Amiserica jizuensis Ahrens, Fabrizi & Liu, 2021

Ahrens, Dirk, Liu, Wangang, Pham, Phu Van & Fabrizi, Silvia, 2021, An overview on the genus Amiserica Nomura, 1974 (Coleoptera: Scarabaeidae: Melolonthinae: Sericini), Zootaxa 5050 (1), pp. 1-63 : 31-32

Amiserica jizuensis Ahrens, Fabrizi & Liu , new species

Figures 8A–D , 16

Type material examined. Holotype: ♂ “ Yunnan 2500–2700m 25.58N 100.21E Jizu Shan 6–10.7. Vit Kuban leg. 1994 / Coll. P. Pacholatko Invt. No. / 571 Sericini Asia spec.” ( CP) . Paratypes: 8 ♂♂, 4 ♀♀ “ China: N-Yunnan, Baiyungshan (Rai Railing Mts.) 2400m, Yong Ren , VII-2003 leg. Ying et al. ” ( ZFMK), 1 ♂ “ China: NW-Yunnan, Yulongshan , Yuniong 3200 m, vii-2004 leg. Ying ” ( ZFMK), 2 ♂♂ “ China: E-Yunnan, Damaidi 2500 m Guangan near Vietnam VII-2003 Li et al. ” ( ZFMK), 6 ♂♂ “ China, W Yunnan Diaolin, 18.VI.1993 E. Jendek & O. Sausa leg.” ( CP, ZFMK), 2 ♂♂ “CH-Yunnan 13–14.VI.1995 100km W of Kunming Diaolin Nat. Reservation E. Jendek & O. Sausa leg.” ( CP), 1 ♂ “ Ch-Yunnan 1995 Daolin 13–14.VI. E. Jendek leg.” ( CP) , 1 ♂, 1 ♀ “ Kunming , Yunnan, 7.VI.1955, 1900m, leg. Li Xiwen / LW-770” ( IZAS) , 2 ♂♂ “CHINA-Yunnan 22.5.-2.6. 100km W Kunming Diaolin Nat. Res. , 1993 E. Jendek & O. Sausa leg.” ( NHMW) .

Description of the holotype. Length: 7.1 mm, length of elytra: 5.0 mm, width: 3.9 mm. Body oval, dirty reddish brown, surface dull, partly iridescent, antenna yellowish brown, on head, pronotum, elytra, and pygidium with long setae interspersed with short adpressed ones (setae directed posteriorly). Setae of holotype partly abraded.

Labroclypeus semicircular, widest at base, lateral margins convex and strongly convergent to strongly rounded anterior angles, lateral border and ocular canthus producing an indistinct angle, anterior margin convex, margins weakly reflexed; surface weakly convex medially and shiny, finely and densely punctate, partly punctures fusing with each other, with dense long erect setae; frontoclypeal suture finely impressed and moderately curved; smooth area anterior to eye 1.5 times as wide as long. Ocular canthus short and triangular (1/3 of ocular width), finely and sparsely punctate, glabrous except a short terminal seta. Frons completely shiny, finely and very densely punctate, with dense long pilosity. Eyes moderately large, ratio of diameter/ interocular width: 0.58. Antenna with ten antennomeres, club with three antennomeres, straight, as long as remaining antennomeres combined. Mentum elevated and flattened anteriorly.

Pronotum widest at base, lateral margins in basal half straight and weakly convergent anteriorly, anterior angles acute and distinctly produced, posterior angles nearly rectangular; anterior margin strongly convex, its marginal line widely interrupted medially; basal margin without marginal line; surface with very dense and fine punctures and with dense double pilosity, long setae (directed nearly upright or forward) interspersed with short adpressed ones (directed posteriorly); anterior and lateral borders densely setose; hypomeron carinate, basal margin of hypomeron weakly produced ventrally. Scutellum subtriangular, apex sharp, with fine and very dense punctures, with mostly short adpressed setae, erect setae very sparse.

Elytra oval, widest well behind the middle, striae indistinctly impressed, with fine and dense punctures; intervals flat, with fine and dense punctures concentrated along striae, with dense double pilosity as in pronotum (short and long adjacent setae directed posteriorly); epipleural edge robust, ending at external apical angle of elytra; epipleura densely setose, apical border broadly membraneous, with a rim of microtrichomes.

Ventral surface moderately shiny, with fine and very dense punctures, including metacoxa with dense, adpressed, short and long setae.Abdominal sternites finely and densely punctate, punctures with short adpressed setae, each sternite with a distinct transverse row of coarse punctures each bearing a long, robust, erect seta. Mesosternum between mesocoxae 1.5 times as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.45. Pygidium weakly convex and shiny, with fine, dense punctures and dense, short and long setae.

Legs wide and short; femora coarsely and densely punctate, punctures with moderately long adpressed setae, with two longitudinal rows of setae; anterior edge of metafemur acute, with an adjacent and slightly elevated continuously serrated line; posterior margin ventrally weakly widened in apical half but not serrate, posterior margin also dorsally not serrate. Metatibia wide and short, widest at apex, ratio width/length: 1/2.3; dorsal margin sharply carinate, with two group of spines, basal one at three quarters, apical one at 7/8 of metatibial length, basally with a few longer single setae, beside dorsal margin with a complete serrated line convergent with dorsal margin behind apical group of spines, between serrated line and dorsal margin finely punctate; lateral face weakly longitudinally convex, with dense and coarse punctures bearing each a short adpressed seta; ventral margin not serrated, with four robust and long, equidistant spines; medial face densely punctate and shortly setose; apex interiorly near tarsal articulation concavely sinuate. Tarsomeres dorsally impunctate and glabrous, ventrally with short and long, dense setae. Metatarsomeres ventrally carinate but not serrated, laterally not carinate; first metatarsomere as long as following tarsomere and little longer than dorsal tibial spur. Protibia very short, bidentate, protarsal claws symmetrical, basal tooth of inner claw simply pointed.

Aedeagus: Fig. 8A–C . Habitus: Fig. 8D .

Variation. Length: 6.6–7.4 mm, length of elytra: 4.7–5.1 mm, width: 3.7–4.1 mm. Female: eyes as large as in male, antennal club shorter than in male, little shorter than remaining antennomeres combined.

Diagnosis. Amiserica jizuensis Ahrens, Fabrizi & Liu , new species is similar to A. argentata (Frey, 1975) , but differs by the strongly asymmetric parameres.

Etymology. The name (adjective in the nominative singular) of the new species is derived from the type locality, Jizu Shan.

Figures

FIGURE 8. A–D: Amiserica jizuensis Ahrens, Fabrizi & Liu, new species (holotype); E–J: A. gibbosiforceps Ahrens, Fabrizi & Liu, new species (holotype); K–N: A. panghongae Ahrens, Fabrizi & Liu, new species (holotype). A, E, K: Aedeagus, left side lateral view; C, I, M: Aedeagus, right side lateral view; B, F: Aedeagus, dorsal view; G, L: Parameres, dorsal view; H: Parameres, ventral view; D, J, N: Habitus (not to scale). Scale: 0.5 mm.

FIGURE 16. Distribution of the species of the Amiserica jizuensis group.