Chaetocnema (Chaetocnema) deqinensis Ruan, Konstantinov & Yang, 2014

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 : 43-45

8. Chaetocnema (Chaetocnema) deqinensis Ruan, Konstantinov & Yang, 2014

( Fig. 27 )

Chaetocnema (Chaetocnema) deqinensis Ruan, Konstantinov and Yang, 2014: 70 . TL: China, Yunnan. TD: IZCAS.

Distribution: China (Guizhou, Yunnan), India.

Host plants: Duchesnea indica (Andr.) Focke (recorded by Ruan et al., 2014).

Description: Body length: 1.80–2.15 mm, excluding head: 1.60–1.95 mm. Body width: 0.90–1.10 mm. Ratio of length of antenna to length of body: 0.64–0.65 mm. Ratio of elytron length (along suture) to width (maximum): 2.40–2.60. Ratio of pronotum width (at base) to length: 1.60–1.60. Ratio of length of elytron to length of pronotum (along middle): 2.95–2.97. Ratio of width of elytra at base (in middle of humeral calli) to width of pronotum at base: 1.14–1.15. Ratio of maximum width of elytra to maximum width of pronotum: 1.46–1.48.

Elytra, pronotum and head bronzy. Antennomere 1 partially dark brown, 2–4 completely yellow, 5 partially brown, 6-11 brown. Tibiae partially brown. Pro- and mesofemora light brown. Metafemora brown.

Head hypognathous. Frontal ridge narrow, convex. Frontolateral sulcus present. Suprafrontal sulcus deep laterally, absent in middle. Orbital sulcus deep. Ratio of width of frontal ridge (excluding margin) to width of antennal socket (excluding margin): 1.04–1.07. Ratio of width of orbital sulcus to width of frontolateral sulcus: 0.88–0.90. Number of punctures on vertex: 8–10. Number of punctures on orbit: 4. Number of setae along frontolateral sulcus: 9–10. Number of punctures on frons (triangular area surrounded by frontolateral sulcus and clypeus): 0. Number of setae on clypeus: 9. Number of setae on labrum: 6. Anterior margin of labrum slightly concave in middle.

Pronotum with two obscure longitudinal impressions visible only near basal margin. Deep row of large punctures at base of pronotum present laterally, absent in middle. Pronotal base evenly convex. Lateral margins of pronotum slightly convex, converging forward. Anterolateral prothoracic callosity protruding laterally, forming an obtuse angle fronto-laterally. Posterolateral prothoracic callosity poorly developed. Diameter of pronotal punctures 2 to 4 times smaller than distance between them.

Elytra with convex lateral sides. All rows of elytral punctures regular and single. Interspaces between striae of punctures smooth and glabrous. Number of rows of minute punctures on each interspace: 2. Humeral calli well developed.

First male protarsomere slightly larger than second. First male protarsomere, length to width ratio: 1.80–1.86. First and second male protarsomeres, length to length ratio: 1.51–1.57. First and second male protarsomeres, width to width ratio: 0.90–0.92. First male protarsomere, ratio of width at apex to width at base: 1.60–1.90. Ratio of length of metatibia to distance between denticle and metatibial apex: 2.30–2.80. Large lateral denticle on metatibia sharp. Metatibial serration proximal to large lateral denticle present, obtuse. First male metatarsomere, length to width ratio: 2.68. First and second male metatarsomeres, length to length ratio: 1.60–1.70. First and second male metatarsomeres, width to width ratio: 0.83–0.85. Third and fourth male metatarsomeres, length to length ratio: 1.45–1.60.

Apex of aedeagus in ventral view narrowing abruptly with obscure oblique lines on lateral sides. Ventral surface of apical fourth of aedeagus deeply concave. Ventral longitudinal groove poorly developed. Apical denticle in ventral view absent. Minute transverse wrinkles on ventral side absent. Aedeagus in lateral view unevenly curved, sinusoidal near apex. Maximum curvature in lateral view near apex.

Spermathecal receptacle barrel-shaped. Basal part of spermathecal duct straight. Spermathecal pump much shorter than receptacle, with cylindrical apex. Receptacle wider basally than apically. Posterior sclerotization of tignum spoon-shaped, wider than mid-section. Mid-section of tignum nearly straight or slightly curved. Anterior sclerotization of tignum about as wide as mid-section. Apex of vaginal palpus subtriangular, with lateral margin convex. Vaginal palpus (before apex) narrowing from base till middle, thence slightly widening towards apex. Anterior sclerotization of vaginal palpus nearly parallel. Anterior end of anterior sclerotization narrowly rounded. Posterior sclerotization longer than wide. Posterior sclerotization wider than anterior.

Types: 1♂ (Holotype) (in IZCAS), labels: 1) China, east slope of Baiman snow mountain, Deqin, Yunnan, alt. 3300m. 2) 28.VIII.1981, leg. Shuyong Wang, host: Duchesnea indica . 3) Holotype, Chaetocnema deqinensis sp. nov., Des. Ruan et al. 2014.

8♂ 23♀ (Paratypes), Baiman snow mountain, Deqin , Yunnan, alt. 3300m, 28.VIII.1981, leg. Shuyong Wang , host: Duchesnea indica , 1♀ ( USNM) ; 1♂, Liuku , Yunnan, alt. 900m, 13.VI.1981, leg. Shuyong Wang ; 1♂ (Para- type), Zhiben Mountain, Yunlong , Yunnan, alt. 2250m, 21.VI.1981, leg. Shuyong Wang ; 1♂ 1♀ (Paratypes), Xin- zhu, Ludian, Lijiang , Yunnan, alt. 2800m, 29.VII.1981, leg. Shuyong Wang ; 1♀ (Paratype), Baoshan , Yunnan, alt. 1500m, 18.VI.1981, leg. Shuyong Wang ; 1♂ (Paratype), Heilongtang, Kunming , Yunnan, alt. 2000m, 14.V.1981, leg. Shuyong Wang ( USNM) ; 1♂ 4♀ (Paratypes), Tsengyih, Meitan , Guizhou, 15.VII.1940, leg. Gressitt ( SYSU) . Paratypes all in IZCAS, except those indicated as in USNM.

Material: 1♂ ( USNM), South India, Western Ghats Karnataka Prov , env. Mudigere, 14.XI. 2003, 904m, river, leg. Konstantinov, Prathapan, Saluk.

Remarks: Chaetocnema deqinensis resembles C. yulongensis . It can be separated from the latter by the following characters: maximum curvature of aedeagus in lateral view situated close to apex; apex of aedeagus broadly rounded in ventral view; suprafrontal sulcus absent in middle. In C. yulongensis , maximum curvature of aedeagus in lateral view situated medially; apex of aedeagus narrowly rounded; suprafrontal sulcus obtuse in middle.

Figures

FIGURE 27. Chaetocnema deqinensis. A Male habitus (Holotype). B Prothorax, dorsal view. C Head, frontal view. D1–D2 Aedeagus, ventral view; D3 Aedeagus, lateral view. E Apex of aedeagus, dorsal view. F Vaginal palpi. G Spermatheca. H Tignum.