Gonioctena (Asiphytodecta) eburoides
Creators: name: Cho, Hee-Wook
name: Borowiec, Lech
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Chrysomelidae
Gonioctena
Gonioctena eburoides

description: Gonioctena (Asiphytodecta) eburoides (Achard, 1924) stat. restit.
(Figs 1, 6, 13–18, 29)
Phytodecta eburoides Achard, 1924: 34 (original description).
Phytodecta (Phytodecta) eburoides: WINKLER (1930): 1296 (catalogue).
Phytodecta eburoide [sic!]: CHEN (1934): 76 (synonymy with G. flavoplagiata).
Gonioctena (Asiphytodecta) flavoplagiata: MEDVEDEV (1987): 76 (misidentification).
Type locality. ‘ Annam, Pak-Lang’.
Type material examined. LECTOTYPE (designated by YANG et al. 2014): ♀, ‘ Annam Pak Lang // eburoides n. sp. type // TYPE // Gonioctena (Asiphytodecta) eburoides (A.) Det. S. GE 2004 // Gonioctena eburoides (Achard, 1924) det. H.W. Cho 2014’ (NMPC). PARALECTOTYPE: 1 ♀, ‘Kouy-Tchéou [= Guizhou] CHINE // eburoides n. sp. type // TYPE // Gonioctena (Asiphytodecta) eburoides (A.) Det. S. GE 2004 // Gonioctena eburoides (Achard, 1924) det. H.W. Cho 2014’ (NMPC).
Additional material examined. VIETNAM: LANG SON: Montes Mauson [= Mt. Mau Son], April–Mai, 2–3000 ft., 1 ♂ 2 ♀♀, H. Fruhstorfer [leg.] (ZMHB). LAO CAI: Sa Pa, 11.–19.vi.1990, 1500 m, 2 ♂♂, Jan Strnad leg. (HCCA, NHMB); Sa Pa, 11.–16.vi.1990, 1 ♂, A. Olexa leg. (LMCM); Sa Pa, 11.–18.vi.1990, 2 ♀♀, A. Olexa leg. (NHMB); Sa Pa, 11.–19.vi.1990, 1 ♂, Brantlová leg. (AWCW); Sa Pa, 15.iv.1962, 1 ♀, A. Warchałowski leg. (AWCW). VINH PHUC: Tam Dao, v.1990, 1 ♂, M. Jančíková leg. (FKCC).
Description. Measurements in mm (n = 4): length of body: 6.90–7.55 (mean 7.24); width of body: 4.75–4.95 (mean 4.89); height of body: 3.30–3.60 (mean 3.49); width of head: 2.00–2.05 (mean 2.03); interocular distance: 1.40–1.45 (mean 1.42); width of apex of pronotum: 2.35–2.45 (mean 2.38); width of base of pronotum: 4.07–4.32 (mean 4.24); length of pronotum along midline: 1.85–1.90 (mean 1.89); length of elytra along suture: 5.10–5.70 (mean 5.46).
Body oval and strongly convex (Fig. 1). Head dark reddish-brown to dark brown. Mandibles reddish-brown, apex black. Maxillary palps reddish-brown, with apical palpomere dark brown.Antennomeres I–V yellowish-brown, VI–VII blackish-brown, VIII–XI black. Pronotum brown to blackish-brown, margins black. Scutellum dark brown, basal margin black. Elytra brown to blackish-brown, with two pairs of yellowish-brown spots. Venter dark brown to black, with hypomera and last abdominal ventrite partially dark reddish brown. Legs dark reddish brown, with basal half or more of femora darkened.
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. Frons flat, suddenly depressed at anterior margin, covered with dense punctures. Clypeus very narrow and trapezoidal.Anterior margin of labrum with tooth-like projection. Mandibles with two sharp apical teeth and deep excavation for apical maxillary palpomere on outer side. Maxillary palps 4-segmented, with apical palpomere slightly widened, truncate apically. Antennae reaching pronotal base; antennomere I robust, longest; II as long as III; III longer than IV; VIII–XI strongly widened and flattened, VIII–X each distinctly wider than long, XI about 0.94 times as long as wide (Fig. 13).
Pronotum. Lateral sides rounded, widest at base, thence strongly narrowed anteriorly; anterior angles strongly produced (Fig. 6). Anterior and lateral margins bordered, lateral margins well visible in dorsal view. Trichobothria absent on both, anterior and posterior, angles. Disc covered with sparse or moderately dense 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 beyond middle, thence roundly narrowed posteriorly. Humeral calli well developed. Disc covered with irregular, coarse and large punctures except humeri, elytral suture and lateral margins; punctures partially arranged in double rows; interspaces covered with fine and sparse punctures. Epipleura visible in lateral view except near base. Hind wings well developed.
Venter. Hypomera weakly 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 tooth-like projection. Fore legs with tarsomere I slightly narrower than III in male; distinctly narrower than III in female. Tarsal claws appendiculate.
Genitalia. Aedeagus rather thin, subparallel-sided in middle, moderately narrowed from apical 1/3 to blunt apex, setose apicolaterally in dorsal view; strongly curved, with apical process weakly recurved in lateral view (Figs 14–17). Spermatheca C-shaped, thin and apex blunt (Fig. 18).
Differential diagnosis. Gonioctena (A.) eburoides is very similar to G. (A.) flavoplagiata and G. (A.) jindrai sp. nov. in body coloration and shape of antennomeres. From these two species, G. (A.) eburoides can be distinguished only by aedeagus with apical process broad and moderately narrowed apically (short, very thin and parallel-sided in G. flavoplagiata and short, thin and elongate-oval in G. (A.) jindrai sp. nov.). Gonioctena (A.) mausonensis differs in reddish brown venter while G. (A.) truncaticornis sp. nov. differs in rather truncate apex of last antennomere.
Distribution. Vietnam: Lang Son, Lao Cai, and Vinh Phuc (Fig. 29); the record from China is doubtful.
Remarks. Gonioctena (A.) eburoides (Achard, 1924) was described from Annam and Guizhou and later synonymized with G. (A.) flavoplagiata (Jacoby, 1890) by CHEN (1934). This synonymy was followed by many authors (CHEN 1935, 1936, 1938; GRESSITT & KIMOTO 1963; KIMOTO & GRESSITT 1981; KIPPENBERG 2010; YANG et al. 2014; YANG et al. 2015). Recently, YANG et al. (2014) designated a lectotype of G. (A.) eburoides and the restricted type locality became ‘ Annam: Pak-Lang’ [Vietnam; however, we did not locate Pak-Lang in any recent gazetteers] (ICZN 1999: Recommendation 74E). After examining types and many other specimens from Northern Vietnam, we found clear differences between the two taxa (see Diagnosis). Therefore, G. (A.) eburoides is removed from synonymy with G. (A.) flavoplagiata and its specific status is restored. The paralectotype of G. (A.) eburoides collected in Guizhou is a female, but we have not examined any male specimens from China. Thus its conspecificity with true G. eburoides is doubtful. The occurrence of G. (A.) eburoides in China should be confirmed by new material.
description: Published as part of Cho, Hee-Wook & Borowiec, Lech, 2016, Revision of theGonioctena flavoplagiata species-group (Coleoptera: Chrysomelidae: Chrysomelinae), with descriptions of two new species from China and Laos, pp. 755-768 in Acta Entomologica Musei Nationalis Pragae 56 (2) on pages 757-758, DOI: 10.5281/zenodo.5310352