Chaetocnema (Chaetocnema) yunnanica Heikertinger, 1951

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 : 125-127

51. Chaetocnema (Chaetocnema) yunnanica Heikertinger, 1951 (New Status, elevated to species)

( Fig. 72 )

Chaetocnema discreta yunnanica Heikertinger, 1951: 205 . TL: China, “ Yunnan, Vallis flumin. Soling-ho”. TD: NHMB. (New Status, elavated to specie s)

Distribution: China (Yunnan).

Host plants: Rubus sp. (new record here).

Description: Body length 2.00– 2.40 mm, body width 1.10–1.30 mm. Ratio of elytron length (along suture) to width (maximum): 2.30–2.50. Ratio of pronotum width (at base) to length: 1.80–1.82. Ratio of length of elytron to length of pronotum (along middle): 3.0–3.1. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): 1.10–1.15. Ratio of maximum width of elytra to maximum width of pronotum: 1.40–1.50.

Elytron blue to blue brown. Pronotum metallic blue. Antennomeres 1–2 partially dark brown, 3–4 partially brown, 5–11 completely brown. Tibiae partially brown. Profemora light brown. Mesofemora light brown or brown. Metafemora dark brown.

Head hypognathous. Frontal ridge narrow and convex. Frontolateral sulcus present. Suprafrontal sulcus shallow and faint, straight to shallowly retuse. Ratio of width of frontal ridge to width of antennal socket: 1.50–1.55. Frons with long setae laterally. Vertex strongly raised, situated well above level of orbit. Vertex with 9–14 weak punctures bearing seta on each side near eye. One strong puncture bearing long seta situated on each side of supraorbital sulcus.

Base of pronotum without longitudinal impressions. Deep row of large punctures at base of pronotum absent. Pronotal base moderately expanded in middle. Area adjacent to mid basal margin of pronotum covered with punctures. Pronotum without shallow transverse impression near base. Lateral margins of pronotum slightly convex, strongly converging forward. Anterolateral prothoracic callosity protruding forward, acutely angulate. Posterolateral prothoracic callosity poorly developed. Diameter of pronotal punctures 2 to 4 times smaller than distance between them.

Elytra with convex lateral sides. Elytral punctures larger than those of pronotum. Scutellar row of punctures confused or more than one. Second row of punctures confused near elytral base. Third to eleventh rows of punctures regular. Humeral callus well developed.

Large lateral denticle on metatibia sharp. Metatibial serration proximal to large lateral denticle present, obtuse. Dorsal surface of metatibia proximal to denticle concave.

Apical third of aedeagus narrowed in lateral view. Distal end of aedeagus in ventral view narrowing abruptly, forming angular apex. Ventral longitudinal groove of aedeagus absent or poorly developed. Apical denticle of ae- deagus in ventral view absent. Minute transverse wrinkles on ventral side of aedeagus absent. Aedeagus in lateral view evenly and slightly curved. Maximum curvature of aedeagus in lateral view situated medially.

Spermathecal pump much shorter than receptacle, with cylindrical apex. Spermathecal receptacle pear-shaped. Maximum width of receptacle situated basally. Receptacle basally wider than apically. Apex of vaginal palpus subtriangular, with lateral margin slightly convex. Vaginal palpus narrowing from base till middle, thence slightly widening towards apex. Anterior sclerotization of vaginal palpus slightly widening anteriorly. Anterior end of anterior sclerotization broadly rounded. Posterior sclerotization longer than wide. Posterior sclerotization about as wide as or wider than anterior.

Types: ♀ (Holotype) (NHMB): 1) Vallis flumin, Soling–ho, Yun.; 2) discreta yunnanica det. Heiktgr Holotypus; 3) discreta yunnanica m. Typus; 4) 1953 Coll. Heikertinger.

Material: 10♂ 15♀, China, Yunnan, Lushui , leg. Shuyong Wang, 8.VI.1981, alt. 1900m , host plant: Rubus sp.; 3♂ 8♀, China, Yunnan, Jingping, Changpotou , leg. Keren Huang et al., 23.V.1956, alt. 1200m ; 2♀, China, Yunnan, Xishuanbanna, Menhun , leg. Shuyong Wang, 30.VI.1958, alt. 870m ; 1♀, China, Yunnan, Xishuanbanna, Menhun , leg. Xuwu Meng, 21.V.1958, alt. 1200m ; 2♂ 4♀ ( USNM), China, Yunnan, 60 km W Baoshan , nr. Pumanshao, 3–VI–2012, N24.55°, E98.47°, Alt. 1925m , WP–343, leg. A. Konstantinov.

Remarks: C. yunnanica was described by Heikertinger (1951) as a subspecies of C. discreta ( C. puncticollis ). However, it differs from C. puncticollis by the shape of pronotum and aedeagus. More over, its dorsum is invariably blue green and the body size is distinctly larger, besides other subtle differences. Hence C. yunnanica is here elevated to species level.

Figures

FIGURE 72. Chaetocnema yunnanica (New status). A Habitus. B Pronotum and peri-scutellar area. C Head, frontal view. D Aedeagus, ventral view. E Aedeagus, lateral view. F Apex of aedeagus, ventral view. G Vaginal palpi. H Spermatheca. I Pygidium (tergite 7) of female. J Tignum. K Head, lateral view, indicating strongly raised vertex.