Serica tianmushan 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 : 11-12

Serica tianmushan Ahrens, Fabrizi & Liu , new species

Figures 1E–H , 21

Type material examined. Holotype: ♂ “ Mts. Tianmushan , Zhejiang, 8.VI.1964, 1200m, leg. Chen Tailu / LW-153” ( IZAS) . Paratypes: 1 ♂, 3 ♀♀ “ Mts. Gutianshan , Zhejiang, 1-4.V.2010, 446- 715m, leg. Liu Chongling, No. G 24ha- 16/ LW-915” ( IZAS) , 1 ♂ “ China Zhejiang Prov. Kaihua Co. Mt. Gutian alt. 400-500m 29°14’N, 118°08’E 19-VI- 2013 Yu Y,-M leg. ” ( SNUC) , 1 ♂ “ China: Zhejiang, Gutianshan NNR. 2010, CSP 14, 639m 118.14°E, 29.25°N local collector” ( NME) , 1 ♂ “ China: Zhejiang, Gutianshan NNR. 2010, CSP 10, 670m 118.16°E, 29.25°N local collector” ( NME) , 1 ♀ “ China: Zhejiang, Gutianshan NNR. 2010, CSP 24, 366m 118.13°E, 29.21°N local collector” ( NME) , 1 ♀ “ China: Zhejiang, Gutianshan NNR. 2010, local collector/ CSP15: 2010 618m 118.13°E, 29.25°N ” ( NME) , 2 ♂♂, 1 ♀ “ China: Zhejiang, Gutianshan NNR 2010, CSP 11, 647m 118.14°E, 29.27°N ” ( NME, ZFMK) .

Description of the holotype. Length: 8.8 mm, length of elytra: 6.5 mm, width: 4.6 mm. Body elongate, dorsal face yellow and dull, glabrous, abdomen brown, antenna yellow.

Labroclypeus subtrapezoidal, little wider than long, widest at base, lateral margins weakly convex and moderately convergent to moderately rounded anterior angles, lateral margin and ocular canthus producing a blunt angle, margins moderately reflexed; anterior margin distinctly emarginate medially; surface convex, finely and densely punctate, with a few long, erect setae anteriorly; frontoclypeal suture weakly impressed and angled medially; smooth area in front of eye approximately twice as wide as long; ocular canthus short and fine (1/4 of ocular diameter), very finely sparsely punctate, with a terminal seta. Frons with fine, dense punctures, dull toment anteriorly weaker, glabrous except for a few setae beside eyes. Eyes moderately large, ratio of diameter/interocular width: 0.6. Antenna composed of 9 antennomeres, club with three antennomeres, straight, 1.1 times as long as remaining antennomeres combined. Mentum anteriorly elevated and flattened.

Pronotum transverse and subtrapezoidal, widest at base, lateral margins evenly and weakly convex, weakly convergent anteriorly; anterior angles moderately produced and rectangular; posterior angles blunt, moderately rounded at tip; anterior margin weakly convex, fine marginal line complete medially; basal margin without marginal line; surface finely and densely punctate, glabrous; anterior and lateral margins without setae. Scutellum wide, triangular, with fine and sparse punctures, glabrous.

Elytra oblong, widest at posterior quarter, striae distinctly impressed, finely and densely punctate; intervals weakly convex, with fine, moderately dense punctures concentrated along striae; odd intervals with a few fine, erect, short setae, otherwise glabrous; epipleural margin robust, ending at strongly rounded external apical angle of elytra, epipleura sparsely setose, apical border membraneous, with a rim of microtrichomes.

Ventral surface dull, metasternum and metacoxa with large and dense punctures, almost completely glabrous; metacoxa glabrous except for a several long setae laterally. Abdominal sternites, in addition to generally distributed fine and moderately dense punctures, each with a distinct transverse row of coarse punctures each bearing a short and robust seta, otherwise glabrous; penultimate sternite apically with a shiny smooth short chitinous border and a wide transversal shallow impression at middle. Mesosternum between mesocoxae narrower than mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.37. Pygidium moderately convex, yellow but dull, with fine, moderately dense punctures and a few longer setae on apical half.

Legs moderately wide and long; femora with two longitudinal rows of setae, finely and moderately densely punctate; metafemur dull, anterior margin acute, lacking an adjacent serrated line, posterior ventral margin straight, not widened in apical half, entirely serrate, dorsal margin also serrate, finely setose. Metatibia moderately wide and long, widest at apex, ratio width/length: 1/3.8, dorsally sharply carinate, with two groups of spines, basal one at middle, apical one at four fifths of metatibial length; in basal half with a few punctures and short fine spines; lateral face longitudinally convex, with moderately dense and coarse punctures, glabrous; ventral margin serrate, with two widely distant spines; medial face finely sparsely punctate and with sparse short setae, apex interiorly near tarsal articulation shallowly concave. Tarsomeres irregularly partly coarsely punctate dorsally, ventrally with sparse, short setae; metatarsomeres with a strongly serrated ridge ventrally and a smooth subventral longitudinal carina; first metatarsomere ventrally glabrous, little shorter than following two tarsomeres combined and almost twice as long as dorsal tibial spur. Protibia moderately long, bidentate. All claws symmetrical, feebly curved and long, with normally developed basal tooth.

Aedeagus: Fig. 1E–G . Habitus: Fig. 1H .

Diagnosis. Serica tianmushan Ahrens, Fabrizi & Liu , new species differs from the very similar Serica longula Frey, 1972 by the shape of parameres: the left paramere has a large arched basal lobe, the right paramere is compacter and shorter.

Etymology. The name of the new species (noun in apposition) is derived from its type locality Tianmushan.

Variation. Length: 8.6–8.9 mm, length of elytra: 6.0– 6.6 mm, width: 4.2–4.9 mm. Head, pronotum and scutellum in some specimens greenish yellow. Female: antennal club short, little shorter than remaining antennomeres combined; pygidium strongly evenly convex; eyes little smaller than in male, ratio diameter/ interocular width: 0.55.

Figures

FIGURE 1. A–D: Serica longula Frey, 1972 (Kuatun, Fukien); E–H: S. tiammushan Ahrens, Fabrizi & Liu, new species (holotype); I–M: S. longwan Ahrens, Fabrizi & Liu, new species (holotype). A, E, I: Aedeagus, left side lateral view; C, G, L: Aedeagus, right side lateral view; B, F, K: Parameres, dorsal view; J: aedeagus, dorsal view; D, H, M: Habitus (not to scale). Scale: 0.5 mm.

FIGURE 21. Distribution of Serica adspersa Frey, 1972, S. daqiaoana Ahrens, Fabrizi & Liu, new species, S. dissimillima Ahrens, Fabrizi & Liu, new species, S. jiankouensis Ahrens, Fabrizi & Liu, new species, S. longwang Ahrens, Fabrizi & Liu, new species, S. mensonana Ahrens, Fabrizi & Liu, new species, S. solivaga Brenske, 1898, S. tianmushan Ahrens, Fabrizi & Liu, new species .