Smaragdina hejingensis Duan, Wang & Zhou, 2022

Duan, Wen-Yuan, Wang, Feng-Yan & Zhou, Hong-Zhang, 2022, Two new species of the genus Smaragdina Chevrolat, 1836 (Coleoptera, Chrysomelidae, Cryptocephalinae) from China, ZooKeys 1082, pp. 1-26 : 1

Smaragdina hejingensis Duan, Wang & Zhou sp. nov.

Figures 1 , 2

Diagnosis.

This new species is the nearest to S. flavilabris (Briet, 1917) but can be distinguished by the shape of pronotal marking: S. flavilabris has the metallic blue marking rhombic, whereas in the new species this marking is not. Additionally, the anterior margin of the clypeus in the new species is yellowish brown but black in S. flavilabris .

Etymology.

The specific is named after the type locality, Hejing.

Type locality.

China: Xinjiang: Hejing.

Material examined

(n = 6). Holotype: male, China: Xinjiang: Hejing , 30.VII.1958, coll. Changqing Li (IZ-CAS) . Paratypes: China: Xinjiang: 3 males, 2 females, Hejing, 31.VII.1958, coll. Changqing Li (IZ-CAS) .

Measurements

(n = 6). Body length males: 5.2-5.9 mm, females: 5.1-5.6 mm.

Description.

Body (Figs 1A, B , 2A ) oblong, largely metallic blue. Mandibles yellowish brown, apex tinged with brown; labrum darkish brown; ventral side of mouthpart yellowish brown; four basal antennomeres yellow, others brown. Pronotum largely metallic blue, lateral sides with yellowish brown marking. Scutellum black. Ventral side of body largely metallic blue, prosternum yellowish brown, femora of hind legs tinged with black, last segments of tarsi and claws brown.

Head small, with dense and coarse punctures. Mandibles (Fig. 2B ) short, labrum slightly incised at anterior margin, length ratio of maxillary palpomeres 0.5:2.4:1.5:2.4; while that of labial palpomeres 0.5:1.8:2.8; mentum rectangular emarginated at anterior margin. Clypeus lateral sides slightly depressed, anterior margin feebly incised; frons covered with shallow wrinkles; inner sides of eyes with short pubescence; vertex not convex, with fine wrinkles. Antennae short, extending to base of prothorax, pubescent, 1st antennomere oblong, 2nd rounded, 3rd slender, slightly longer than 2nd, 4th triangular, a little longer than 3rd, serrated from 5th segment onwards.

Pronotum transverse, about 2 × as wide as long, moderately convex; anterior margin slightly convex, lateral margins rounded, posterior margin sinuated, all margins (especially lateral ones) bordered; surface with coarse punctures, denser on median basal area. Scutellum widely triangular, with extremely fine punctures; apex slightly elevated over elytral surface.

Elytra 1.7 times as long as wide at humeri, covered with confused and dense punctures, interstices shorter than a puncture diameter, punctures becoming sparse posteriorly, and nearly disappearing at elytral apices.

Underside and legs thickly clothed with silvery pubescence; apex of pygidium arcuate. Tarsi slender, length ratio of protarsomeres 1.6:1.0:0.3:2.0. Tibiae of females slightly curved, legs robust, tarsi broad.

Aedeagus (Figs 1D-G , 2E-G ) sword-shaped, about 3.4 × as long as wide; apex triangular; bent ventrally; without pubescence.

Female. Coloration of body darker than male, base of hind tibiae black; legs slender, tarsi narrow. Last segment of abdomen with a fossa. Spermatheca (Figs 1C , 2H ) hook-shaped, apex swollen and blunt, duct base thickened, not coiled. Rectal sclerites moderately sclerotized, ventral rectal sclerites (Fig. 1H ) large, clubbed; dorsal rectal sclerites (Fig. 1I ) protruding medially; lateral sclerites large.

Distribution.

China (Xinjiang).

Figures

Figure 1. Smaragdina hejingensis Duan, Wang & Zhou, sp. nov. A habitus B lateral view of habitus C spermatheca D lateral view of aedeagus E ventral view of aedeagus F dorsal view of aedeagus G apex of aedeagus H ventral rectal sclerites I dorsal rectal sclerites. Scale bars: 0.5 mm (A, B), 0.2 mm (C-I).

Figure 2. Smaragdina hejingensis Duan, Wang & Zhou, sp. nov. A habitus B mandibles C maxilla D labium E dorsal view of aedeagus F lateral view of aedeagus G ventral view of aedeagus H spermatheca. Scale bars: 0.5 mm.