Gonioctena (Brachyphytodecta) medvedevi Cho & Borowiec

Cho, Hee-Wook & Borowiec, Lech, 2016, On the genus Gonioctena Chevrolat (Coleoptera: Chrysomelidae: Chrysomelinae), with descriptions of seven new species from the Oriental region and Palaearctic China, Zootaxa 4067 (2), pp. 168-184 : 177-178

Gonioctena (Brachyphytodecta) medvedevi Cho & Borowiec sp. nov.

(Figs 17–18, 45–47)

Types. Holotype: male (LMCM), Vietnam, Prov. Vinh-Phu, Tam-dao, L. Medvedev @ Dang Dap // on Ormosia (Fab.) // HOLOTYPUS Gonioctena (Brachy.) medvedevi sp. n. Cho & Borowiec 2014. Paratypes: 1 male and 1 female (LMCM), same data as holotype; 1 male (LMCM), Vietnam, TamDao, 900 m, 4.VI.1987, L. Medvedev et al. // PARATYPUS Gonioctena (Brachy.) medvedevi sp. n. Cho & Borowiec 2014. 1 male (TLMF), Vietnam, Prov.

Vinh-Phu, Tam-dao, L. Medvedev @ Dang Dap // PARATYPUS Gonioctena (Brachy.) medvedevi sp. n. Cho & Borowiec 2014.

Diagnosis. Gonioctena (Brachyphytodecta) medvedevi sp. nov. is very similar to G. (B.) flavipennis (Jacoby, 1888) and G. (B.) mauroi sp. nov. in having short oval and reddish brown body. From these two species, Gonioctena medvedevi sp. nov. can be distinguished only by aedeagus with apical process widest before apex and setose (short, roundly widened and glabrous in G. flavipennis , Fig. 40, and rather short, widest at middle and setose G. mauroi sp. nov., Fig. 44). Due to similar coloration, three Eastern Palaearctic species, Gonioctena (Brachyphytodecta) fulva (Motschulsky, 1861) , G. (B.) andrzeji Daccordi & Ge, 2007 and G. (B.) kidoi Takizawa & Daccordi, 1998 resemble this new species, but differ in having long oval body shape.

Description. Measurements in mm (n = 3): length of body: 6.10–6.40 (mean 6.27); width of body: 4.50–4.90 (mean 4.67); height of body: 2.90–3.10 (mean 3.00); width of head: 1.80–1.87 (mean 1.82); interocular distance: 1.15–1.20 (mean 1.17); width of apex of pronotum: 2.10 (mean 2.10); width of base of pronotum: 4.15–4.25 (mean 4.18); length of pronotum along midline: 1.80–1.85 (mean 1.82); length of elytra along suture: 4.60–5.00 (mean 4.80).

Body short oval and strongly convex (Fig. 17). Head reddish brown, with apex of mandibles black. Antennomeres 1–5 yellowish brown, 5 partially darkened, 6–11 black. Pronotum reddish brown, basal margin black. Scutellum reddish brown. Elytra reddish brown, tip partially darkened. Venter reddish brown. Legs blackish brown to black.

Head. Vertex weakly convex, covered with sparse punctures, becoming coarser and denser toward sides. Frontal suture V-shaped, reaching anterior margin, coronal suture rather long, weak. Frons flat, strongly depressed at anterior margin, covered with dense punctures. Clypeus very narrow and trapezoidal. Anterior margin of labrum almost straight. Mandibles with 2 sharp apical teeth, a large excavation for maxillary palp at outer side. Maxillary palp 4-segmented, with apical palpomere slightly widened, truncate apically. Antennae reaching base of pronotum; antennomere 1 robust; antennomere 2 shorter than 3; antennomere 3 longer than 4; antennomeres 7–10 distinctly widened, 8–10 each wider than long; antennomere 11 longest, about 1.25 times as long as wide (Fig. 45).

Pronotum. Lateral sides widest at base, roundly narrowed anteriorly, anterior angles strongly produced (Fig. 18). Anterior and lateral margins bordered, lateral margins barely visible in dorsal view. Trichobothria absent on both anterior and posterior angles. Disc covered with very sparse punctures; lateral sides covered with much larger and denser punctures; interspaces covered with fine and sparse punctures. Scutellum distinctly wider than long, narrowed posteriorly.

Elytra. Lateral sides slightly widened posteriorly, widest before middle, thence roundly narrowed posteriorly. Humeral calli well developed. Disc covered with 11 regular rows of large punctures, including a short scutellar row; interspaces covered with fine and sparse punctures. Epipleura visible except near base in lateral view. Hind wing well developed.

Venter. Hypomera rugose, with a few punctures near anterolateral corners of prosternum. Prosternum covered with coarse and dense punctures bearing long setae; prosternal process enlarged apically, bordered laterally, with sparse punctures. Metasternum covered with small and sparse punctures in median region, large and dense punctures in lateral region. Abdominal ventrites covered with sparse or dense punctures bearing short setae.

Legs. Moderately robust. Tibiae widened apically, with a tooth-like projection. Fore legs with tarsomere 1 slightly narrower than 3 in male; distinctly narrower than 3 in female. Tarsal claws appendiculate.

Genitalia. Aedeagus long and thin, moderately narrowed from base to apical 1/4, setose apicolaterally, with apical process long, moderately widened to lateral tooth-like projections, apex widely triangular in dorsal view; moderately curved, apex blunt in lateral view (Fig. 46). Spermatheca present, club-shaped (Fig. 47).

Etymology. Dedicated to Lev N. Medvedev, the well known Russian specialist in Chrysomelidae .

Distribution. Vietnam (Vinh Phuc).