Serica yini 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 : 34-35

Serica yini Ahrens, Fabrizi & Liu , new species

Figures 7K–N , 22

Type material examined. Holotype: ♂ “ Myanmar: Danasho 2800 m, Minshia vi-2004 leg. Yin et al./ Phil #11- 2004:4./ 1134 Sericini : Asia spec.” ( ZFMK).

Description of the holotype. Length: 9.8 mm, elytral length: 7.0 mm, width: 4.8 mm. Body oblong, dark reddish brown, dull, legs brown, antenna yellow, with sparse short and long setae on dorsal surface.

Labroclypeus moderately wide, trapezoidal, lateral margins straight and moderately convergent, producing a distinct angle with ocular canthus; anterior angles strongly rounded; anterior margin moderately sinuate medially, margins strongly reflexed; surface weakly convex, finely and densely punctate, with numerous long and erect setae; frontoclypeal suture indistinct, curved; ocular canthus moderately short and narrow (1/3 of ocular width), finely and densely punctate, with 1–3 short terminal setae. Frons with dull toment, with coarse, dense punctures and a few long setae. Antenna with nine antennomeres, club with three antennomeres, 2.2 times as long as remaining antennomeres combined, strongly reflexed. Eyes moderately large, ratio diameter/ interocular width: 0.62. Mentum convexly elevated and flattened anteriorly.

Pronotum widest at base, lateral margins in basal half straight and weakly convergent, in anterior half convex and convergent anteriorly; anterior angles rectangular and weakly produced, posterior angles blunt; anterior margin strongly convex, marginal line complete; basal margin without marginal line; surface with mixed coarse and fine, dense punctures, with a few short and longer erect or forward-directed yellow setae. Hypomeron very weakly carinate ventrally. Scutellum narrow and long, triangular, with fine, dense punctation, at base with a smooth impunctate triangular area, with a very few short setae.

Elytra narrow, elongate, widest at middle, striae distinctly impressed, finely punctate, intervals weakly convex, finely and densely punctate, punctures concentrated along striae, elytra with moderately dense, long and erect setae in row on each sides of odd intervals, minute setae absent; epipleural margin robust, ending at strongly rounded external apical angle of elytra, sparsely setose; apex of elytra with a fine membraneous rim of short microtrichomes.

Ventral face coarsely and densely punctate, only metasternal plate and lateral metacoxa with a few long setae, otherwise almost glabrous. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/ metacoxa: 1/ 1.57. Abdominal sternites finely and moderately densely punctate, each with a row of coarse punctures bearing each a robust seta, otherwise glabrous. Pygidium moderately convex, finely and densely punctate, with moderately dense, long setae on apical half.

Legs long and narrow, shiny; femora finely and sparsely punctate, with two longitudinal rows of setae. Metafemur with anterior margin acute, without adjacent serrated line; posterior ventral margin almost straight, weakly widened in apical half, ventrally and dorsally not serrated, sparsely setose. Metatibia long and narrow, widest at apex, ratio width/ length: 1/ 4.6, sharply carinate dorsally, with two groups of robust spines, basal one shortly behind middle, apical one at four fifths of metatibial length, in basal half with a two further small robust setae beside the dorsal margin; lateral face longitudinally convex, finely and moderately densely punctate, glabrous; apex concavely and narrowly sinuate interiorly near tarsal articulation. Tarsomeres finely punctate dorsally, with moderately dense, fine setae ventrally; metatarsomeres ventrally with a strongly serrated carina, subventrally with a second, smooth longitudinal carina; first metatarsomere little shorter than following two tarsomeres combined and little longer than dorsal tibial spur. Protibia long, bidentate; anterior claws symmetric, interior tarsal claws sharply pointed.

Aedeagus: Fig. 7K–M . Habitus: Fig. 7N . Female unknown.

Diagnosis. Serica yini Ahrens, Fabrizi & Liu , new species differs from Serica allolongipes Ahrens, Fabrizi & Liu , new species by the shape of parameres. The apically bluntly widened right paramere has before apex an additional sharp lateral tooth and almost bluntly truncate at apex; the left paramere is robust over its entirly length and shorter, abruptly pointed at apex.

Etymology. The new species (adjective in nominative case) is named after one of its collectors, Mr. Yin.

Figures

FIGURE 7. A–E: Serica paralongipes Ahrens, Fabrizi & Liu, new species (holotype); F–J: S. gaoligong Ahrens, Fabrizi & Liu, new species (holotype); K–N: S. yini Ahrens, Fabrizi & Liu, new species (holotype). A, F, K: Aedeagus, left side lateral view; D, I, M: Aedeagus, right side lateral view; B, C, G, L: Parameres, dorsal view; N: Parameres, ventral view; E, J, N: Habitus (not to scale). Scale: 0.5 mm.

FIGURE 22. Distribution of Serica allolongipes Ahrens, Fabrizi & Liu, new species, S. gaoligong, S. guangnanensis Ahrens, Fabrizi & Liu, new species, S. klapperichi Frey, 1972, S. longipes Ahrens, Fabrizi & Liu, new species, S. nanhua Ahrens, Fabrizi & Liu, new species, S. longula Frey, 1972, S. lupina Arrow, 1946, S. shiduensis Ahrens, Fabrizi & Liu, new species; “?” repre- sents the non-localized occurrence of S. yini Ahrens, Fabrizi & Liu, new species in Myanmar .