Serica jiankouensis 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 : 15-16

Serica jiankouensis Ahrens, Fabrizi & Liu , new species

Figures 2E–H , 21

Type material examined. Holotype: ♂ “ China: NW Guizhou prov. Fanjingshan , 35 km N of Jiankou, 3-4 Jun 1996 1200m, Bolm lgt./ Coll. P. Pacholatko Invt. No. / 727 Sericini : Asia spec.” ( CP).

Description of the holotype. Length: 8.0 mm, length of elytra: 6.0 mm, width: 4.1 mm. Body elongate, dorsal face yellow and dull, glabrous, ventral face, frons and anterior portion of pronotum 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 weakly 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), finely sparsely punctate, without a terminal seta. Frons with fine, dense punctures, dull toment anteriorly weaker, glabrous except for a few setae beside eyes. Eyes small, ratio of diameter/interocular width: 0.58. Antenna composed of 9 antennomeres, club with three antennomeres, straight, as long as remaining antennomeres combined. Mentum anteriorly elevated and flattened.

Pronotum transverse and subtrapezoidal, widest at base, lateral margins evenly convex and convergent anteriorly; anterior angles moderately produced but sharp; posterior angles convex; anterior margin weakly convex, fine marginal line complete medially; basal margin without marginal line; surface finely and densely punctate, with minute setae in punctures; anterior and lateral margins sparsely setose. Scutellum wide, triangular, with fine and dense punctures each bearing a minute seta, base at middle impunctate.

Elytra oblong, widest at posterior quarter, striae distinctly impressed, finely and densely punctate; intervals weakly convex, with fine, moderately dense punctures concentrated along striae; lateral 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. Mesosternum between mesocoxae narrower than mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.27. Pygidium strongly convex in apical half, yellow and 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: 1/4.0, 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 longer than following tarsomere and one third of its length longer than dorsal tibial spur. Protibia moderately long, bidentate. All claws symmetrical, feebly curved and long, with normally developed basal tooth.

Aedeagus: Fig. 2E–G . Habitus: Fig. 2H . Female unknown.

Diagnosis. Serica jiankouensis Ahrens, Fabrizi & Liu , new species differs from the similar S. daqiaoana Ahrens, Fabrizi & Liu , new species in the shorter antennal club (male) and the shape of aedeagus: the phallobase is ventrally at apex more widened, the left paramere in S. jiankouensis Ahrens, Fabrizi & Liu , new species is slightly more compact, with the basal lobe distinctly shorter; the angle of the dorsal margin in the right paramere is more pronounced and the distal dorsal margin (lateral view) is concavely emarginated rather than straight as in S. daqiaoana Ahrens, Fabrizi & Liu , new species which has the angle of the dorsal margin more blunt; furthermore, the right paramere possesses in S. jiankouensis Ahrens, Fabrizi & Liu , new species a short and narrow basal lobe which is lacking in S. daqiaoana Ahrens, Fabrizi & Liu , new species.

Etymology. The name of the new species (adjective in nominative case) is derived from its occurrence close to Jiankou.

Figures

FIGURE 2. A–D: Serica daqiaoana Ahrens, Fabrizi & Liu, new species (holotype); E–H: S. jiankouensis Ahrens, Fabrizi & Liu, new species (holotype). A, E: Aedeagus, left side lateral view; C, G: Aedeagus, right side lateral view; B, F: Parameres, dorsal view; D, H: 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 .