Chaetocnema (Chaetocnema) warchalowskii Döberl, 2009

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 : 117-119

46. Chaetocnema (Chaetocnema) warchalowskii Döberl, 2009

( Fig. 68 )

Chaetocnema punctatula Warchalowski, 1973: 48 [nec. Chaetocnema punctatula Mulsant & Rey, 1874: 222 ]. TL: Pakistan, TD: Warchalowski collection.

Chaetocnema warchalowskii Döberl, 2009: 22 (new name for Chaetocnema punctatula Warchalowski, 1973 )

Distribution: China (Taiwan) ( Döberl, 2010); India, Bhutan, Pakistan, Malaysia.

Host plants: Unknown.

Description (based on examined specimens): Body length 1.30–1.65 mm; width 0.65–0.85 mm. Ratio of elytron length at suture to maximum width, 2.08–2.10. Ratio of pronotum width at base to length at middle, 1.70–1.75. Ratio of length of elytron at suture to length of pronotum at middle, 2.55–2.58. Ratio of width of both elytra at base to width of pronotum at base, 1.15–1.17. Ratio of maximum width of both elytra to maximum width of pronotum, 1.40–1.43.

Dorsum shiny black, without metallic luster. Antennomeres 1–4 completely yellow, 5 partially brown. Tibiae yellow. Pro- and mesofemora yellow brown. Metafemur black or dark brown.

Head hypognathous. Frontal ridge narrow and convex. Frontolateral sulcus present. Suprafrontal sulcus shallow and faint, obcordate. Ratio of width of frontal ridge between outer ridge of antennal sockets to width of antennal socket, 1.40–1.45. Frons with numerous relatively long setae situated on punctures near fronto-lateral sulcus, which is a major difference in comparison with the closely related C. nigrica . Vertex flat, situated on same level as orbit. Surface of vertex without punctures, except 2–3 on each side near eye.

Base of pronotum without longitudinal impressions. Deep transverse row of large punctures at base of pronotum present throughout. Pronotal base slightly expanded in middle. Scutellar row of elytral punctures single and regular. Second to eleventh rows of punctures at base of elytron regular. Humeral callus well developed.

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

Apex of aedeagus in ventral view narrowing gradually. Ventral longitudinal groove of aedeagus absent or poorly developed. Apical denticle of aedeagus in ventral view absent or obsolete. Apex of aedaeagus slightly curved ventrally in lateral view. Minute, transverse wrinkles on ventral side of aedeagus absent. Aedeagus in lateral view nearly straight at base and middle, slightly curved ventrally at apex.

Spermathecal pump much shorter than receptacle, with apex flattened. Spermathecal receptacle oblong, bent distally. Apex of vaginal palpus evenly rounded. 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. Width of posterior sclerotization about as great as that of anterior.

Material: 1♂ 1♀ ( USNM), Malaysia, Sabah, VII–VIII.1983, leg. G. F. Hevel & W. E. Steiner,; 1♂ 1♀ ( USNM), Bhutan, Damphu 16.IX.2005, wp–108, leg. K. Mahat, P. Loday, A. Konstantinov & K. D. Prathapan; 1♂ 6♀ ( USNM), Bhutan, env. Punakha, N 27 36.35 E 89 52.43, 19.IX.2005, 1400m, Leg. K. Mahat, K. D. Prathapan; 1♂ 3♀ ( USNM), South India, Western Ghats Karnataka Prov , env. Mudigere, 14.XI. 2003, 904m, river, leg. Konstantinov, Prathapan, Saluk; 1 ( BMNH), Pakistan: N.W.F. Swat Valley, 15miSW Barikot, 16 October 1977, Collectors: Gary F. Hevel & Mushtaq Ahmad, Chaetocnema det. A. Konstantinov, Chaetocnema warchalowskii Döberl det. Yongying Ruan, 2016.

Remarks: Type specimens are not available for this study, species concept is based on the original description and illustration of aedeagus provided by Warchalowski (1973).

C. warchalowskii closely resembles C. nigrica in external characters, but they may be distinguished from each other by the difference in punctation on frons (in C. warchalowskii , frons more densely punctate above clypeus). Moreover, aedeagus in C. warchalowskii is thinner in lateral view compared to that in C. nigrica . Apex of aedeagus in C. warchalowskii is gradually narrowed, while the same in C. nigrica is abruptly narrowed.

This species also resembles C. resplendens , from which it can be separated by shorter antennae, yellow pro- and mesofemur and shape of the aedeagus. In C. warchalowskii , antennae reach only slightly beyond humeral callus; while in C. resplendens , the antennae are longer and extend beyond middle of the elytra.

Chaetocnema warchalowskii resembles C. yaosanica Chen in the punctation on clypeus. However, they can be easily separated by the difference in punctures on pronotum and the shape of aedeagus.

Figures

FIGURE 68. Chaetocnema warchalowskii. 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 Pygidium (tergite 7) of female.