Gonioctena (Asiphytodecta) allardi, Cho, 2021

Cho, Hee-Wook, 2021, Definition of the Gonioctena subgeminata species group (Coleoptera, Chrysomelidae, Chrysomelinae), with descriptions of two new species from China and Vietnam, ZooKeys 1032, pp. 79-90 : 79

Gonioctena (Asiphytodecta) allardi sp. nov. Figures 1 , 6 , 11 , 12

Type locality.

Vietnam: Hanoi, Son Tay.

Type material.

Holotype: ♂ (MNHN), "Son Tay // Ex. Musaeo E. Allard 1899 // MUSEUM PARIS 1952 Coll. R. Oberthur // HOLOTYPUS Gonioctena (A.) allardi sp. nov. Cho & Borowiec 2014". Paratype: 1♀ (MNHN), same data as for holotype.

Diagnosis.

This new species is similar to Gonioctena mantillerii sp. nov. and G. oudai in body shape and coloration. However, G. allardi sp. nov. can be distinguished by the following characters: elytra covered with rather irregular punctures arranged in confused single or double rows (regular punctures arranged in single rows, partially irregular in other species); pronotum without spots (same in G. mantillerii sp. nov., a pair of lateral obscure spots present in G. oudai ); aedeagus with an apical process widened to lateral tooth-like projections, 1.2 × wider than the median lobe (widened to lateral blunt projections, 1.2 × wider than the median lobe in G. mantillerii sp. nov., very large, 1.5 × wider than the median lobe in G. oudai ).

Description.

Measurements in mm (n = 2): length of body: 6.50-7.50 (mean 7.00); width of body: 5.00-5.80 (mean 5.40); height of body: 3.30-4.00 (mean 3.65); width of head: 1.95-2.10 (mean 2.03); interocular distance: 1.25-1.35 (mean 1.30); width of apex of pronotum: 2.30-2.40 (mean 2.35); width of base of pronotum: 4.42-5.00 (mean 4.71); length of pronotum along midline: 2.00-2.25 (mean 2.13); length of elytra along suture: 4.90-5.90 (mean 5.40).

Body short oval and strongly convex (Fig. 1 ). Head reddish brown, with labrum partially dark brown, apex of mandibles black. Antennomeres I-VI yellowish brown, VI partially darkened, VII-XI blackish brown. Pronotum reddish brown, basal margin black. Scutellum reddish brown. Elytra orange, with a pair of black spots and sinuate transverse bands, dark area between bands, tip partially darkened. Venter and 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 short. Frons flat, suddenly depressed at anterior margin, covered with dense punctures. Clypeus very narrow and trapezoidal. Anterior margin of labrum almost straight. Mandibles with two sharp apical teeth and deep excavation for apical maxillary palpomere on outer side. Maxillary palps four-segmented, with apical palpomere slightly widened, truncated apically. Antennae reaching pronotal base; antennomere I robust; antennomere II shorter than III; antennomere III longer than IV; antennomeres VII-X widened, VIII-X each almost as long as wide; antennomere XI longest, ~ 1.51 × as long as wide (Fig. 11 ). Pronotum. Lateral sides widest at base, strongly and roundly narrowed anteriorly, anterior angles strongly produced (Fig. 6 ). Anterior and lateral margins bordered; lateral margins hardly visible in dorsal view. Trichobothria absent on both anterior and posterior angles. Disc covered with 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 rather irregular punctures arranged in confused single or double rows in median region, regular punctures arranged in rows in lateral region, dense punctures between second and third striae in apical half; interspaces covered with fine and sparse punctures. Epipleura visible except near base in lateral view. Hind wings well developed. Venter. Hypomera weakly rugose, with 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 moderately dense punctures bearing short setae. Legs. Moderately robust. Tibiae widened apically, with a tooth-like projection. Fore legs with tarsomere I slightly narrower than III in male and distinctly narrower than III in female. Tarsal claws appendiculate. Genitalia. Aedeagus rather thin, subparallel-sided, weakly narrowed before apical process, setose apicolaterally, with apical process widened to lateral tooth-like projections in dorsal view; moderately curved, apex pointed in lateral view (Fig. 12 ). Spermatheca C-shaped, swollen basally, with apex rounded (Fig. 13 ).

Etymology.

Named after its collector, E. Allard.

Distribution.

Vietnam (Hanoi).

Figures

Figures 1 - 5. Dorsal habitus 1 Gonioctena allardi sp. nov., holotype 2 G. mantillerii sp. nov., holotype 3 G. oudai 4 G. subgeminata 5 G. tonkinensis. Scale bars: 1.0 mm.

Figures 6 - 10. Head and pronotum 6 Gonioctena allardi sp. nov., holotype 7 G. mantillerii sp. nov., holotype 8 G. oudai 9 G. subgeminata 10 G. tonkinensis. Scale bars: 1.0 mm.

Figures 11 - 13. Gonioctena allardi sp. nov., holotype 11 antenna 12 aedeagus (dorsal view, apex in dorsal view, lateral view) 13 spermatheca. Scale bars: 1.0 mm (11, 12); 0.5 mm (13).