Chaetocnema (Udorpes) shanxiensis Chen &Wang, 1980

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 : 188-190

80. Chaetocnema (Udorpes) shanxiensis Chen &Wang, 1980

( Fig. 109 )

Chaetocnema shanxiensis Chen & Wang, 1980: 4 , 18. TL: China, Shanxi. TD: IZCAS.

Distribution: China (Shanxi).

Host plants: Unknown.

Description: Body strongly elongate in dorsal view, body length 2.30–2.45 mm, body width 1.10–1.20 mm. Ratio of elytron length (along suture) to width (maximum): 3.00–3.10. Ratio of pronotum width (at base) to length: 1.40–1.45. Ratio of length of elytron to length of pronotum (along middle): 3.10–3.20. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): 1.15–1.20. Ratio of maximum width of elytra to maximum width of pronotum: 1.30–1.35.

Dorsum coppery to bronzy. Antennomeres 1–2 dark brown, 3–5 completely yellow or partially brown, 6–11 brown. Pro- and mesotibia partially brown. Metatibia yellow. Femora dark brown, with obscure metallic luster.

Head hypognathous. Frontal ridge wide and flat. Frontolateral sulcus absent. Suprafrontal sulcus deep, slightly arched, well recognized. Ratio of width of frontal ridge to width of antennal socket: 2.00–2.05. Frons evenly covered with relatively short white setae. Vertex flat, without setae, situated on same level as orbit. Vertex densely and evenly covered with punctures, slightly sparser in middle and lower area. Each side of orbit covered with approximately 20 punctures.

Base of pronotum without short longitudinal impressions. Deep row of large punctures at base of pronotum absent. Pronotal base evenly convex. Area adjacent to mid basal margin of pronotum lacks punctures. Pronotum without shallow antebasal transverse impression. Lateral margins of pronotum slightly convex, converging forward. Anterolateral prothoracic callosity not strongly developed. Posterolateral prothoracic callosity weak, obscure. Diameter of pronotal punctures larger than distance between them.

Elytra with lateral sides parallel. Scutellar row of elytral punctures somewhat geminate. Second to eleventh rows of elytral punctures regular. Humeral callus well developed. Punctures on elytra strong, but slightly smaller than those on pronotum.

First and second male protarsomeres, length to length ratio: 1.60–1.70. Large lateral denticle on metatibia obtuse. Metatibial serration proximal to large lateral denticle absent. Excavation on hind tibia shallow.

Apex of aedeagus in ventral view narrowing gradually. Ventral surface of aedeagus flat to slightly concave. Ventral longitudinal groove absent. Ventral longitudinal ridge in middle of aedeagus absent. Apical denticle of aedeagus in ventral view poorly differentiated, short, with narrowly rounded apex. Apical denticle of aedeagus in lateral view slightly curved ventrally. Minute transverse wrinkles on basal part of ventral side of aedeagus absent or poorly developed. Aedeagus in lateral view evenly and strongly curved. Maximum curvature of aedeagus in lateral view situated medially.

Type: 1♂ (Holotype) ( IZCAS), 1) China: Shanxi, 19.VI.1934, Chinese Academy of Sciences ; 2) 19.VI.1934; 3) Holotype, Chaetocnema shanxiensis , det. S. H. Chen.

Remarks: C. shanxiensis is extremely close to C. splendens , but it can be distinguished by the relatively stronger punctation on dorsum and head and the shape of aedeagus. C. shanxiensis also resembles C. alticola , but it may be separated from the latter by narrower frontal ridge and stronger punctation throughout the body.

Figures

FIGURE 109. Chaetocnema shanxiensis. A Holotype, habitus. B Pronotum of Holotype. C Head of Holotype, frontal view. D Aedeagus of Holotype, ventral view. E Aedeagus of Holotype, lateral view. F Apex of aedeagus of Holotype, ventral view.