Serica guangnanensis 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 : 25-26

Serica guangnanensis Ahrens, Fabrizi & Liu , new species

Figures 5E–H , 22

Type material examined. Holotype: ♂ “ China: E-Yunnan; Damaidi 2500 m, Guangnan near Vietnam VII-2003 leg. Li et al./ 717 Sericini Asia spec.” ( ZFMK).

Description of the holotype. Length: 8.4 mm, elytral length: 5.9 mm, width: 4.6 mm. Body oblong, dark brown, dull, legs brown, antenna yellow, with numerous short and long setae on dorsal surface.

Labroclypeus wide, trapezoidal, lateral margins convex and moderately convergent, producing a distinct angle with ocular canthus; anterior angles strongly rounded; anterior margin weakly sinuate medially, margins strongly reflexed; surface weakly convex, finely and densely punctate, with numerous erect setae; frontoclypeal suture indistinct, curved; ocular canthus moderately short and narrow (1/3 of ocular width), finely and densely punctate, with 1–2 short terminal setae. Frons with coarse, dense punctures and numerous long setae. Antenna with nine antennomeres, club with three antennomeres, as long as remaining antennomeres combined. Eyes small, ratio diameter/ interocular width: 0.53. Mentum convexly elevated and flattened anteriorly.

Pronotum widest at base, lateral margins in basal half straight and weakly convergent, in anterior half evenly convex and convergent anteriorly; anterior angles sharp and distinctly produced, posterior angles blunt; anterior margin strongly convex, marginal line complete; basal margin without marginal line; surface coarsely and densely punctate, with numerous short and longer adjacent or erect yellow setae, otherwise punctures with microscopic setae only. Hypomeron carinate but not produced ventrally. Scutellum wide, triangular, punctation as on pronotum, with numerous short adjacent setae.

Elytra narrow, widest in posterior third, striae distinctly impressed, finely punctate, odd intervals weakly convex, even ones flat, finely and densely punctate, punctures concentrated along striae in odd intervals, elytra covered with numerous long adjacent setae apart from minute setae in punctures; 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 or robust setae. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/ metacoxa: 1/ 1.7. Abdominal sternites finely and moderately densely punctate, each with a row of coarse punctures bearing each a robust seta. Pygidium moderately convex, coarsely and densely punctate, with dense, long setae.

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 moderately long and wide, ratio width/ length: 1/ 3.6, sharply carinate dorsally, with two groups of spines, basal one at three fifths, apical one at four fifths of metatibial length, basally with a few robust and short setae in line; lateral face longitudinally convex, finely and superficially sparsely punctate; apex concavely 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 as long as following two tarsomeres combined and as long as dorsal tibial spur. Protibia moderately long, bidentate; anterior claws symmetric, interior tarsal claws sharply pointed.

Aedeagus: Fig. 5E–G . Habitus: 5H. Female unknown.

Diagnosis. Serica guangnanensis Ahrens, Fabrizi & Liu , new species differs from Serica lupina Arrow, 1946 by the short antennal club in male, which is as long as remaining antennomeres combined, and of course by the shape of the aedeagus: phallobase apically deeply emarginated between the insertino of parameres and parameres subequal in length being moderatly long and curved dorsally.

Etymology. The name of the new species (adjective in nominative case) is derived from its type locality Guangnan.

Figures

FIGURE 5. A–D: Serica lupina Arrow, 1946 (paratype); E–H: S. guangnanensis Ahrens, Fabrizi & Liu, new species (holotype); I–L: S. longipes Ahrens, Fabrizi & Liu, new species (holotype). A, E, I: Aedeagus, left side lateral view; C, G, K: Aedeagus, right side lateral view; B, F, J: Parameres, dorsal view; D, G, L: 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 .