Revision of the Oriental Chaetocnema species (Coleoptera, Chrysomelidae, Galerucinae, Alticini) Author Ruan, Yongying Author Yang, Xingke Author Konstantinov, Alexander S. Author Prathapan, Kaniyarikkal D. Author Zhang, Mengna text Zootaxa 2019 2019-11-15 4699 1 1 206 journal article 24881 10.11646/zootaxa.4699.1.1 c374bffb-02ad-4cfd-ab69-fc74b15c27a8 1175-5326 3543038 469CF6FE-D2A3-499F-A9AF-E46B68FBAFD8 Key to species of subgenus Udorpes 1. Body length exceeds 3.00 mm........................................................................... 2 - Body length less than 3.00 mm.......................................................................... 3 2. Antennae long, reaching middle of elytra, dorsum metallic green................. Chaetocnema merguiensis Bryant, 1941 - Antennae normal, not extending to middle of elytra, dorsum cupreous................ Chaetocnema cupreata Chen, 1934 3. Body length less than 1.70 mm .......................................................................... 4 - Body length exceeds 1.70 mm ........................................................................... 5 4. Pronotal base obviously expanded and convex at middle; body strongly convex at sides, body strongly narrowed and pointed towards posterior end...................................................... Chaetocnema paraumesaoi sp. nov. - Pronotal base evenly and very slightly convex at middle; body slightly convex at sides, posterior end of body rounded.............................................................................. Chaetocnema umesaoi Chûjô, 1961 5. Vertex covered with extremely weak and shallow punctures, hardly visible; vertex impunctate in middle....................................................................................... Chaetocnema reteimpunctata sp. nov. - Vertex covered with large punctures, without impunctate area in middle (in rare cases there is an extremely narrow longitudinal impunctate area in middle).............................................................................. 6 6. Antennae very short, not reaching base of elytra; wingless, humeral calli absent............. Chaetocnema glabra sp. nov. - Without such combination of characters................................................................... 7 7. Body strongly elongate and narrow; body length to width proportion exceeds 2.00; elytron length (along suture) to width (maximum) proportion exceeds 3.00........................................................................... 8 - Body normal, not strongly elongate....................................................................... 9 8. Pronotal punctures extremely bold; the distance between adjacent punctures equal to or smaller than diameter of punctures; hind wings highly reduced.................................................. Chaetocnema alticola Maulik, 1926 - Pronotal punctures normal, distance between punctures 1-2 times more than the diameter of punctures................................................................................. Chaetocnema shanxiensis Chen & Wang, 1980 9. Elytral punctures regular, arranged in single rows (excluding peri-scutellar punctures).............................. 13 - Elytral punctures not placed in single regular rows, confused or geminate........................................ 10 10. Elytral punctures partially geminate; peri-scutellar punctures tripled. Pronotal punctures minute, extremely closely placed............................................................................ Chaetocnema psylloides Pic, 1909 - Punctures on elytra confused or extremely closely placed with extra rows........................................ 11 11. Elytra extremely closely punctate with 15-17 rows of punctures............................................... 12 - Elytra not extremely closely punctate; however, confusedly punctate, punctures somewhat arranged in paired rows in the middle of elytron........................................................ Chaetocnema pusaensis Maulik, 1926 12. Aedeagus without apical denticle, apical third of aedeagus straight; dorsum with punctures extremely strong and much larger than those in C. malayana , interspace of pronotal punctures 0.5-1 times larger than their diameter; interspace of elytral punctures 1-1.5 times larger than their diameter................................. Chaetocnema concinnipennis Baly, 1877 - Aedeagus with apical denticle, apical third of aedeagus bent ventrally; dorsum with punctures finer than C. concinnipennis , interspace of pronotal punctures 1-2 times larger than their diameter; interspace of elytral punctures 1.5-2.5 times larger than their diameter............................................................. Chaetocnema malayana Baly, 1877 13. Basal third of pronotum strongly narrowed and constricted, narrower than middle; inter-antennal space narrow, width of interantennal space to width of antennal socket less than 1.5; pronotum only slightly wider than long, width to length ratio less than 1.5................................................................................................ 14 - Base of pronotum not strongly narrowed and constricted, not narrower than middle................................ 15 14. Body robust, cylindrical; lateral sides of elytra parallel........................... Chaetocnema cylindrica ( Baly, 1874 ) - Body normal, ovate; lateral sides of elytra convex...................... Chaetocnema modesta Gressitt & Kimoto, 1963 15. Pronotum with a longitudinal impunctate area in middle..................................................... 16 - Pronotum without an impunctate area in middle............................................................ 20 16. Hind wings absent, antero-lateral angle of pronotum invisible from dorsal view....... Chaetocnema rahlensis Shukla, 1960 - Hind wings entire, antero-lateral angle of pronotum visible from dorsal view..................................... 17 17. Body length exceeds 2.40 mm .......................................................................... 18 - Body length less than 2.40 mm ......................................................................... 19 18. Elytra strongly costate at sides, peri-scutellar punctures form three or four rows; inter-antennal space about as wide as antennal socket.................................................................. Chaetocnema westwoodi Baly, 1877 - Elytra not costate or only slightly costate; peri-scutellar punctures arranged in two short rows, occasionally more than two lines; inter-antennal space obviously wider than antennal socket.......................... Chaetocnema ingenua ( Baly, 1876 ) 19. Peri-scutellar punctures form four rows; frons and orbit extremely strongly and closely punctate, with interspace of punctures narrower than diameter of punctures......................................... Chaetocnema midimpunctata sp. nov. - Peri-scutellar punctures geminate; frons and orbit normally punctate, with interspace wider than diameter of punctures.......................................................................... Chaetocnema modiglianii Jacoby, 1896 20. Head narrow, orbit narrow; ratio of width between inner-margin of eyes to width of diameter of eye less than 2.00; supra-orbital sulcus, supra-antennal and supra-frontal sulci ‘W’ shaped.................................................... 21 - Head and orbit normal or wide; ratio of width between inner-margin of eyes to width of diameter of eye more than 2.00... 22 21. Pronotum quadrate, lateral sides straight and parallel to each other................... Chaetocnema angustifrons sp. nov. - Pronotum not quadrate, lateral sides convex and slightly converging forward.............. Chaetocnema belli Jacoby 1904 22. Elytra strongly costate; vertex strongly punctate, with punctures as large as those on frons.......................... 23 - Elytra not strongly costate or only costate at sides........................................................... 24 23. Body length 1.90–2.00 mm; peri-scutellar punctures single or slightly geminate........ Chaetocnema singala Maulik, 1926 - Body length exceeds 2.20 mm , body robust; peri-scutellar punctures usually form three rows, occasionally geminate............................................................................. Chaetocnema bretinghami Baly, 1877 24. Body somewhat broad, pronotum broad, base of pronotum as wide as that of elytra................................ 25 - Body normal, pronotum not conspicuously broad, base of pronotum narrower than elytral base....................... 28 25. A shallow transverse depression present near the base of pronotum; hind wings absent............................................................................................... Chaetocnema sulcicollis Chen & Wang, 1980 - Base of pronotum without a transverse depression.......................................................... 26 26. Dorsum shiny metallic green; supra-antennal and supra-orbital sulci obsolete, covered by punctures; the space between eye and antennal socket wide and densely covered with coarse punctures........................ Chaetocnema greenica sp. nov. - Dorsum not metallic green, supra-antennal and supra-orbital sulci present; space between eye and antennal socket narrow... .................................................................................................. 27 27. Peri-scutellar punctures single or partially geminate; apical denticle of aedeagus wide and truncate with concave apex............................................................................. Chaetocnema paragreenica sp. nov. - Peri-scutellar punctures geminate; apical denticle of aedeagus narrow and flat at top..... Chaetocnema latapronota sp. nov. 28. Antennae robust and shortened, not extending beyond humeral calli over pronotum................................ 29 - Antennae slender and long, extending slightly beyond humeral calli over pronotum................................ 30 29. Anterolateral calli of pronotum well developed, produced antero-laterally, truncate and oblique, prominent from upper view.................................................................. Chaetocnema zangana Chen & Wang, 1981 - Anterolateral calli of pronotum not strongly produced, rounded, not prominent from upper view........................................................................................... Chaetocnema kumaonensis Scherer, 1969 30. Peri-scutellar punctures form three rows................................... Chaetocnema concinnicollis ( Baly 1874 ) - Peri-scutellar punctures geminate........................................................................ 31 31. Head evenly and strongly punctate; frons, orbit and vertex evenly punctate with equally strong punctures......................................................................... Chaetocnema eastafghanica Konstantinov et al. , 2011 - Head with frons more strongly punctate than vertex; punctures on vertex shallow and distant........................ 32 32. Pronotum widened anteriorly, with base narrower than apex.......................... Chaetocnema bella ( Baly, 1876 ) - Pronotum not widened anteriorly, with base as wide as or wider than apex....................................... 33 33. Peri-scutellar punctures geminate or occasionally form three rows, peri-scutellar rows of punctures reach the middle of elytra; hind wings reduced.......................................................... Chaetocnema cognata Baly, 1877 - Peri-scutellar punctures form single row or geminate, with fewer punctures than in C. cognata , peri-scutellar rows of punctures short, not reaching the middle of elytra......................................... Chaetocnema afghana Gruev, 1988