Chaetocnema (Chaetocnema) duvivieri Jacoby, 1892

Ruan, Yongying, Yang, Xingke, Konstantinov, Alexander S., Prathapan, Kaniyarikkal D. & Zhang, Mengna, 2019, Revision of the Oriental Chaetocnema species (Coleoptera, Chrysomelidae, Galerucinae, Alticini), Zootaxa 4699 (1), pp. 1-206 : 45-47

9. Chaetocnema (Chaetocnema) duvivieri Jacoby, 1892

( Fig. 28 )

Chaetocnema duvivieri Jacoby, 1892: 939 . TL: Myanmar (Tenasserim). TD: MCSN??

Distribution: China (Tibet); India (Arunachal Pradesh), Myanmar (Tenasserim).

Host plants: Unknown.

Description: Body length: 2.40–2.65 mm. Body width: 1.30–1.40 mm. Ratio of elytron length (along suture) to width (maximum): 2.30–2.35. Ratio of pronotum width (at base) to length: 1.80–1.85. Ratio of length of elytron to length of pronotum (along middle): 3.00–3.10. Ratio of width of elytra at base (in middle of humeral calli) to width of pronotum at base: 1.05–1.10.

Dorsum bronzy with green metallic luster. Dorsum and surface of head smooth and shiny, without rugose pattern. Antennomeres 1–6 light yellow brown, distal ones deep yellow brown. Tibiae and tarsi yellow brown, pro- and mesofemora deep yellow brown. Metafemora brown with slight metallic luster.

Head hypognathous. Frontal ridge narrow, slightly convex. Frontolateral sulcus present. Suprafrontal sulcus shallow, arched. Orbital sulcus and supra-antennal sulcus deep. Ratio of width of frontal ridge (excluding margin) to width of antennal socket (excluding margin): 0.80–0.85. Vertex with numerous irregularly placed tiny punctures. Orbit smooth, shiny, without punctures. Number of punctures on frons (triangular area surrounded by frontolateral sulcus and clypeus): 0. Number of setae on clypeus: approximately 10. Number of setae on labrum: 6. Anterior margin of labrum almost straight.

Pronotum without longitudinal impressions near basal margin. Deep row of large punctures at base of pronotum present, with punctures distantly placed, especially in middle. Pronotal base gently convex at sides, strongly convex at middle. Lateral margins of pronotum very slightly convex, more or less converging forward.Anterolateral prothoracic callosity somewhat obtusely angulate, not prominent. Posterolateral prothoracic callosity poorly developed. Pronotal punctures tiny, with diameter 2–4 times smaller than distance between them. Punctures more distantly placed towards sides of pronotum.

Elytra with slightly convex lateral sides. Elytral punctures distinctly larger than those on pronotum and head. Elytral punctures arranged in regular rows, including peri-scutellar row. Interspaces between striae of punctures smooth and glabrous, with extremely minute punctures. Humeral calli well developed.

Excavation on metatibia shallow. Large lateral denticle on metatibia obtuse. Metatibial serration proximal to large lateral denticle absent.

Apex of aedeagus in ventral view narrowing abruptly. Ventral longitudinal groove shallow. Apical denticle in ventral view weak, somewhat acute. Minute transverse wrinkles on ventral side absent. Aedeagus in lateral view curved in basal half and straight in distal half, with maximum curvature in lateral view situated at middle.

Material: 1♂ ( BMNH): ‘ Burma’, Mishmi Hills, Dingliang , 2450ft., 12.III.1935 , M. Steele, Brit. Mus., 1935– 312; 1♀ ( IZCAS), China, Tibet, 2015-VIII-29, Zhengzhong Huang leg.

Remarks: Type materials are not exmamined in this study, species concept are based on the original description.

We have examined BMNH collection, there is a drawer with the label ‘ Chaetocnema duvivieri Jacoby, 1892 ’, however, no specimen was found. The type is probably housed in MCSN ( Italy, Genova, Museo Civico di Storia Naturale "Giacomo Doria") as stated by Maulik (1926: 209). The locality label of a specimen in BMNH states “ Burma, Mishmi Hills, Dingliang, 2450ft., 12.III.1935, M. Steele, Brit. Mus., 1935–312” but the Dingliang Village lies within Arunachal Pradesh (Hayuliang Circle Taluk, Lohit District, Pin Code: 792104), the eastern-most state of India, adjacent to Myanmar. Therefore, C. duvivieri must also be treated as occurring in Arunachal Pradesh, India .

Figures

FIGURE 28. Chaetocnema duvivieri. A Male habitus. B Pronotum. C Head, frontal view. D Aedeagus, ventral view. E Aedeagus, lateral view. F Apex of aedeagus, ventral view. G Vaginal palpi. H Spermatheca. I Tignum of female.