Sphenoraia (Sphenoraioides) nebulosa (Gyllenhal, 1808)

Feng, Chuan, Yang, Xing-Ke, Li, Zhi-Qiang & Liu, Yang, 2022, Revision of Sphenoraia Clark, 1865 (Coleoptera, Chrysomelidae, Galerucinae) from China, with descriptions of two new species, ZooKeys 1132, pp. 51-83 : 51

Sphenoraia (Sphenoraioides) nebulosa (Gyllenhal, 1808)

Fig. 6A-F

Galleruca nebulosa Gyllenhal, 1808: 292.

Sphenoraia (Sphenoraioides) nebulosa : Laboissière 1934: 132.

Other specimens examined.

1♀, China, Hainan Province; 8 Aug. 1934 ; IZAS. 1♂, China, Hainan; 24 Mar. 1934 ; IZAS. 1♂, China, Hainan Province, Jianfengling ; 13-17 Apr. 1984 ; IZAS. 1♂, Lingnan University ; 10 May 1948 ; En-119989; SYSU. 1♂, China, Guangxi Province, Yangshuo ; 29 Jun. 1938 ; IZAS. 1♂, China, Guangxi Province, Yangshuo ; 6 Apr. 1938 ; IZAS. 1♀, China, Guangxi Province, Yangshuo ; 14 Oct. 1938 ; IZAS. 1♀, China, Guangxi Province, Fulong, Pinglong Mountain ; 650 m; 13 Mar. 1998; Gexia Qiao leg. ; IZAS. 1♂, China, Guangxi Province, Longzhou, Nonggang ; 330 m; 15 Jun. 2000; Wenzhu Li leg. ; IZAS. 1♂, China, Guangxi Province, Guilin ; 14 Aug. 1952 ; IZAS. 2♀, China, Guangxi Province, Guilin ; 19 Sep. 1952 ; IZAS. 2♀, China, Guangxi Province, Guilin ; 19 Sep. 1952 ; IZAS. 5♂ 5♀, China, Guangxi Province, Guilin ; 6 Mar. 1952 ; IZAS. 1♀, China, Yunnan Province, Yiwubannan, Menglun ; 650 m; 25 Jul. 1959; Yiran Zhang leg. ; IZAS. 1♂, China, Yunnan Province, Yiwubannan, Menglun ; 650 m; 3 Apr. 1964; Baolin Zhang leg. ; 1♂, China, Yunnan Province, Xishuangbanna, Mengla ; 620-650 m; 27 May 1959; Fuji Pu leg. ; IZAS. 1♂, China, Yunnan Province, Xishuangbanna, Damenglong ; 650 m; 13 Apr. 1958; Shuyong Wang leg. ; IZAS.

Description.

Male. Length 6.2-6.8 mm, width 4.6-5.2 mm.

Head, pronotum, elytra and legs yellow, antennae and ventral surface of the body yellowish brown, scutellum brown; pronotum with a black spot on each side; each elytron with seven black spots, basal, middle, and subapical areas each with one pair of spots, apical area with one spot; some specimens have reduced or dark grey spots on the elytra, some have black spots interconnected.

Vertex finely and sparsely covered with punctures; frontal tubercle distinctly raised, separated from each other by a deep furrow; antennae short, robust, extend to the middle of the elytra; antennomeres 1-3 thin, shiny; antennomeres 4-11 wide and flat, with short hairs, antennomere 4 approximately 2.5 × as long as wide; antennomeres 5-10, each approximately 1.6 × as long as wide; antennomeres 2 and 3 shortest, antennomere 3 similar in length and shape to antennomere 2, antennomere 4 longest, 1.5 × as long as antennomeres 2 and 3 combined; antennomeres 5-10 gradually shortened, shorter than 4; antennomere 11 slightly longer than 10, pointed.

Pronotum approximately 2.5 × as wide as long, with rounded lateral margins; disc slightly convex, sparsely covered with small punctures, with the punctures on the pronotum larger than those on the head.

Scutellum triangular, smooth, impunctate.

Basal width of both elytra wider than the pronotum, gradually widen posteriorly and rounded at apex; dorsal surface slightly convex, irregularly covered with large and deep punctures, the interstices between punctures slightly wider than diameter of individual punctures.

Metasternum 2.5 × as long as mesosternum; prothoracic legs shortest, mesothoracic legs slightly longer, metathoracic legs longest.

Ventral surface of abdomen with five segments, segment 1 longest, segments 2-4 gradually shortened, apical segment slightly longer than segment 4, with three lobes.

Aedeagus slender, parallel-sided, basally widened, apex rounded. In lateral view moderately bent.

Female. Length 6.2-6.6 mm, width 4.5-5.0 mm.

Antennae yellow, antennomeres 6-11 brown; antennomeres 1-5 thin, antennomeres 6-11 wide and flat, each approximately 1.5 × as long as wide; antennomere 2 shortest, antennomere 3 slightly longer than 2, 1.2 × as long as second; antennomere 4 longest, slightly longer than antennomeres 2 and 3 combined; apical sternite flatted.

Differential diagnosis.

This species can be distinguished from the other species by black spots of the pronotum and elytra. However, it especially resembles Sphenoraia (Sphenoraioides) haizhuensis , the former differs in having a scutellum without punctures, and the aedeagus in lateral view being moderately bent.

Distribution:

China: Guangdong, Hainan, Guangxi, Yunnan; Vietnam, Laos, Cambodia, Thailand, Myanmar, India, Sikkim.

Figures

Figure 6. Sphenoraia (Sphenoraioides) nebulosa A-C habitus D-F aedeagus A, D dorsal views B, E ventral views C, F lateral views. Scale bars: 1 mm (A-C); 0.5 mm (D-F).