Gonioctena (Asiphytodecta) oudai 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 : 170-172

Gonioctena (Asiphytodecta) oudai Cho & Borowiec sp. nov.

( Figs 3–4 , 33–34 )

Types. Holotype: male (NMPC), China, SW Sichuan, Mt. Emei, 1000–2000 m, 6.VI.1997, M. Ouda lgt. // HOLOTYPUS Gonioctena (A.) oudai sp. n. Cho & Borowiec 2015. Paratype: 1 male (LMCM), China: Sichuan, Mt. Emei, 600–1050 m, 5.–19.V.1989, Lad. Bocak lgt. // PARATYPUS Gonioctena (A.) oudai sp. n. Cho & Borowiec 2015.

Diagnosis. Gonioctena (Asiphytodecta) oudai sp. nov. is similar to G. (A.) coccinella (Chen, 1931) and G. (A.) tonkinensis ( Chen, 1934) in having similar coloration and labrum with almost straight anterior margin. Gonioctena oudai sp. nov. can be distinguished from G. coccinella by a pair of lateral obscure spots on pronotum (a basal transverse obscure band in G. coccinella ), reddish brown elytral suture (black except middle in G. coccinella ) and aedeagus setose apicolaterally with apical process much wider than median lobe (glabrous, narrowed before apex in G. coccinella , Fig. 35 ). Gonioctena tonkinensis differs in having a pair of basal triangular black markings on pronotum and aedeagus with apical process slightly narrower than median lobe.

Description. Measurements in mm (n = 2): length of body: 5.90–6.20 (mean 6.05); width of body: 4.20–4.30 (mean 4.25); height of body: 2.70–2.80 (mean 2.75); width of head: 1.80–1.82 (mean 1.81); interocular distance: 1.10–1.15 (mean 1.13); width of apex of pronotum: 2.07 (mean 2.07); width of base of pronotum: 3.75–3.80 (mean 3.78); length of pronotum along midline: 1.60–1.80 (mean 1.70); length of elytra along suture: 4.20–4.30 (mean 4.25).

Body short oval and strongly convex ( Fig. 3 ). Head reddish brown, with apex of mandibles black. Antennomeres 1–7 yellowish brown, 7 partially darkened, 8–11 blackish brown. Pronotum reddish brown, basal margin black, with a pair of lateral obscure spots. Scutellum reddish brown. Elytra orange, with 3 pairs of black spots, a sinuate transverse band, dark area in median region, tip partially darkened. Venter largely dark reddish brown. Legs entirely reddish brown.

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, suddenly 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 not reaching base of pronotum; antennomere 1 robust; antennomere 2 longer than 3; antennomere 3 as long as 4; antennomeres 7–10 widened, 8–10 each wider than long; antennomere 11 longest, about 1.60 times as long as wide ( Fig. 33 ).

Pronotum. Lateral sides widest at base, roundly narrowed anteriorly, anterior angles strongly produced ( Fig. 4 ). Anterior and lateral margins bordered, lateral margins well visible in dorsal view. Trichobothria absent on both anterior and posterior angles. Disc covered with very sparse punctures; lateral sides covered with large and moderately dense punctures; interspaces covered with fine and sparse punctures. Scutellum distinctly wider than long, narrowed posteriorly.

FIGURES 13–18. Dorsal habitus (13, 15, 17) and head and pronotum (14, 16, 18). 13–14. G. (B.) incondita ; 15–16. Gonioctena (B.) mauroi sp. nov.; 17–18. G. (B.) medvedevi sp. nov. Scale bars: 1.0 mm.

Elytra. Lateral sides very slightly widened posteriorly, widest beyond 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. Tarsal claws appendiculate.

Genitalia. Aedeagus subparallel-sided, setose apicolaterally, with apical process strongly widened to lateral blunt tooth-like projections, much wider than median lobe in dorsal view; weakly curved, apex pointed in lateral view ( Fig. 34 ).

Etymology. Named after its collector, M. Ouda.

Distribution. China (Sichuan).

Note. Yang et al. (2014) described Gonioctena (Brachyphytodecta) bezdeki , which is conspecific with G. oudai sp. nov. However, it was not explicitly indicated as intentionally new, a mandatory requirement ( ICZN 1999: Article 16.1). Thus the name Gonioctena (Brachyphytodecta) bezdeki is not available for nomenclature.

Figures

FIGURES 1 – 6. Dorsal habitus (1, 3, 5) and head and pronotum (2, 4, 6). 1 – 2. Gonioctena (A.) mausonensis sp. nov.; 3 – 4. G. (A.) oudai sp. nov.; 5 – 6. G. (A.) subgeminata. Scale bars: 1.0 mm.

FIGURES 33 – 39. Antenna (33, 36, 38) and aedeagus (34 – 35, 37, 39, dorsal, apical and lateral views). 33 – 34. Gonioctena (A.) oudai sp. nov.; 35. G. (A.) coccinella; 36 – 37. G. (A.) sapaensis nom. nov.; 38 – 39. G. (B.) arunensis sp. nov. Scale bars: 1.0 mm.