Chaetocnema (Udorpes) zangana Chen & Wang, 1981

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 : 196-198

85. Chaetocnema (Udorpes) zangana Chen & Wang, 1981

( Fig. 114 )

Chaetocnema zangana Chen & Wang, 1981: 493 . TL: China, Tibet. TD: IZCAS.

Distribution: China (Tibet).

Host plants: Unknown.

Description: Body length 1.95–2.10 mm, body width 1.06–1.09 mm. Ratio of elytron length (along suture) to width (maximum): 2.40–2.50. Ratio of pronotum width (at base) to length: 1.50–1.65. Ratio of length of elytron to length of pronotum (along middle): 2.50–2.60. 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: 1.40–1.45.

Dorsum dark bronzy. Antennae short and robust. Antennomeres 1–6 completely yellow brown, 7–11 brown. Tibiae and tarsi yellow brown. Pro- and mesofemora red brown. Metafemora dark brown.

Head hypognathous. Frontal ridge wide, flat, covered with large punctures. Ratio of width of frontal ridge to width of antennal socket: 2.25–2.50. Frontolateral sulcus absent. Suprafrontal sulcus moderately developed, with an obscure pit in middle. Orbital sulcus poorly developed, shallower than supraantennal sulcus. Punctures on vertex moderately close, with size smaller than those on frons. Frons with middle area flat and glabrous, lateral sides covered with large punctures, distinctly larger than those on vertex. Number of setae on clypeus: approximately 20. Number of setae on labrum: 6. Anterior margin of labrum straight.

Pronotum without longitudinal impressions near basal margin. Deep row of large punctures at base of pronotum absent. Pronotal base evenly convex. Lateral margins of pronotum almost straight, converging forward. Anterolateral prothoracic callosity rather thick, truncate, facing anterolaterally. Posterolateral prothoracic callosity poorly developed. Diameter of pronotal punctures 2 to 4 times smaller than distance between them.

Elytra with convex lateral sides. Scutellar row of punctures geminate, confused. Remaining rows of elytral punctures regular and single. Interspaces between striae of punctures smooth and glabrous. Humeral callus well developed.

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

Spermatheca with receptacle sinuated. Spermathecal duct straight basally, distal part distorted. Spermathecal pump much shorter than receptacle, with flat apex. Receptacle basally as wide as apically. Apex of vaginal palpus narrowly rounded.Anterior end of anterior sclerotization angled. Posterior sclerotization longer than wide. Width of posterior sclerotization subequal to that of anterior. Tignum anteriorly curved, a little wider than medially; posterior sclerotization spoon shaped, wider than anterior part.

Type: 1♀ (Holotype), 1) China: Xizang (Tibet), Jilong , alt. 2800m. 2) 23.VII.1975, leg. Xuezhong Zhang; 3) Holotype; 4) Holotype, Chaetocnema zangana, Det. S. H. Chen .

Remarks: This species resembles C. kumaonensis . However, in C. kumaonensis , with lateral margins of pronotum are more convex, and the anterolateral calli of pronotum are much more weakly developed; while in C. zangana , lateral margins of pronotum are nearly straight, and the anterolateral calli of pronotum are truncate and strongly developed. Moreover, in C. zangana , surface of head and pronotum are finely granulate, while in C. kumaonensis head and pronotum are smooth and shiny, not granulate.

Figures

FIGURE 114. Chaetocnema zangana. A Holotype (female), habitus. B Pronotum and peri-scutellar area of Holotype. C Head of Holotype, frontal view. D Vaginal palpi of Holotype. E Spermatheca Holotype. F Tignum of Holotype. G Pygidium (tergite 7) of Holotype.