Smaragdina yangae, Wang, Feng-Yan & Zhou, Hong-Zhang, 2013

Wang, Feng-Yan & Zhou, Hong-Zhang, 2013, Four new species of the genus Smaragdina Chevrolat, 1836 from China (Coleoptera: Chrysomelidae: Cryptocephalinae: Clytrini), Zootaxa 3737 (3), pp. 251-260 : 255-257

Smaragdina yangae sp. nov.

( Figs. 3 A–I, 5C).

Type material. Holotype: CHINA: Sichuan: ♂, Yajiang, Qingdagou, 2816m, 2009. V.26, leg. Ganyan Yang (IZ-CAS). Paratypes: CHINA: Sichuan: 7♂♂, 3♀♀, same data as holotype; 1♀, Yajiang, 2595–2816m, 30.033903°N, 101.013417°E, 2009. V.25–26, leg. Ganyan Yang (IZ-CAS).

Measurement. Length: males: 2.6–2.9mm, females: 3.6–3.8mm. Width: males: 1.3–1.6mm, females: 1.6– 1.8mm.

Etymology. The new species is dedicated to the collector of the type specimens, Dr. Ganyan Yang.

Diagnosis. This new species is well characterized by the small body size, large elytral punctures and spirally coiled spermathecal duct.

Remarks. The new species shares a similar dorsal color pattern with the previous species Smaragdina yajiangensis sp. nov., but S. yangae sp. nov. has much smaller elytral markings and more regular elytral punctures which is striate near suture. Also, the spermathecal duct is spirally coiled in this new species while that of Smaragdina yajiangensis sp. nov. is loosely coiled.

In some specimens, the pronotal color pattern of the new species is similar with S. micheli Medvedev, 1995 : pronotum fulvous with four black spot. Howerver, they have different elytral pattern and aedeagus: each elytron of the new species with two markings while S. micheli Medvedev only has a single humeral spot. Also, the new species has a round apex of the median lobe, but S. micheli Medvedev has a triangular apex.

Description. Coloration pattern: Head fulvous, basal half black (sometimes about basal 1/3), mandibular tip reddish-brown, underside of mouth parts brown; 1st antennomere fulvous, 2nd and 3rd antennomeres darker, 5th–11th antennomeres black. Pronotum completely fulvous, or with two to four small indistinct spots arranged in a row on disc; scutellum black. Elytra paler than pronotum, with black markings: one elongate spot on humeral calli, sometimes with a small distinct or indistinct spot between the humeral spot and scutellum, another elongate spot on elytral slope, not touching suture and lateral margins of elytra. Underside black, propleura fulvous. Legs fulvous, while tarsi dark brown.

Body: slender. Head: small, lustrous. Mandibles short, labrum slightly incised at anterior margin, length ratio of maxillary palpomeres 0.1:0.3:0.3:0.8; while that of labial palpomeres 0.2:0.9:1.4; mentum inverse-trapezoidally emarginate. Clypeus slightly convex, lustrous, anterior margin nearly straight; frons with a shallow impression in the middle, as well as a few confused punctures and wrinkles around; inner sides of eyes sparsely pubescent; vertex feebly convex, impunctate except for posterior sides of eyes, rugous. Antennae: nearly extending to base of prothorax, pubescent, 1st antennomere strongly clavate, 2nd round, 3rd slender, 4th widely triangular, a little longer than the third one, serrated from 5th segment onwards.

Prothorax: transverse, about 2.1 times as wide as long, moderately convex; anterior margin slightly concave, lateral margins slightly rounded, convergent anteriad, posterior margin slightly rounded, thickened in scutellar area, anterior angles rectangular, posterior ones broadly rounded, all margins narrowly bordered; surface lustrous and impunctate. Scutellum triangular, lustrous and impunctate, apex slightly elevated.

Elytra: cylindrical, 1.75 times as long as wide at humeral part, covered with very large punctures, punctures round and darkish, striate near suture, disappearing in elytral slope.

Underside and legs: thickly clothed with silvery pubescence; apex of pygidium arcuate. Tarsi slender, length ratio of protarsomeres 1.1:0.9:0.2:1.0.

Aedeagus: Median lobe moderately bent ventrally, with rounded apex, without pubescence, lateral arms of the aedeagus narrow and slightly emarginated.

Female. Body robuster than males; Pygidium: posterior border of pygidium moderately emarginate; Spermatheca: hook-shaped, apex thinner than basal part, spermathecal duct spirally coiled up 20 to 30 times; Rectal apparatus: ventral sclerites of rectal apparatus slender, dorsal central sclerite nearly inverse-trapezoidal.

Figures

FIGURE 3. Smaragdina yangae sp. nov.: (A) habitus; (B) maxilla; (C) labium; (D) male genitalia in dorsal view; (E) male genitalia in lateral view; (F) male genitalia in ventral view; (G) spermatheca; (H) ventral rectal sclerites; (I) dorsal rectal sclerites. Scales = 0.5 mm.