Oodescelis, Motschulsky, 1845

Bai, Xing-Long, Li, Xiu-Min & Ren, Guo-Dong, 2019, A review of the genus Oodescelis Motschulsky, 1845 (Coleoptera: Tenebrionidae Platyscelidini) from China, Zootaxa 4656 (3), pp. 401-430 : 406

Key to species of the genus Oodescelis from China (based on males)

1. Anterior margin of pronotum deeply emarginate, anterior angles sharp........................................... 2

- Anterior margin of pronotum straight or nearly straight, anterior angles obtuse..................................... 6

2. Prosternal process, in lateral view, weakly obtuse apically; elytra elongate-oval, surface of elytral apex and epipleura dull, surface of epipleura without punctures or wrinkles (subgenus Planoodescelis )..................................... 3

- Prosternal process, in lateral view, sharp apically; elytra oval, surface of elytral apex and epipleura shiny, surface of epipleura with punctures and wrinkles (subgenus Acutoodescelis )....................................................... 4

3. Body black; pronotum widest at base, disc with dense punctures; elytra flattened, width at middle almost equal to that at base; abdomen without setal brush; metatibiae slightly curved; parameres much shorter than phallobase, base of parameres nearly as wide as apex, distal part wide and flat ( Figs. 39–40 ).............. Oodescelis (Planoodescelis) kansouensis Kaszab, 1940

- Body brown; pronotum widest at middle, disc with very sparse punctures; elytra weak convex, width at middle obviously wider than that at base; abdominal ventrites 1, 2 and 5 with setal brush at middle; metatibiae straight; parameres nearly as long as phallobase, base of parameres strongly wider than apex, distal part narrow and long ( Figs. 41–42 )................................................................................ Oodescelis (Planoodescelis) lii Bai & Ren , sp. nov.

4. Pronotal punctures elongate, merging into distinct longitudinal long furrows at sides; metatibiae weakly curved................................................. Oodescelis (Acutoodescelis) punctatissima punctatissima ( Fairmaire, 1886)

- Pronotal punctures round, part of them merging into extremely short longitudinal furrows at sides; metatibiae straight..... 5

5. Elytral punctures as large as those on pronotum but sparser; base of parameres not parallel laterally ( Fig. 15 )......................................................... Oodescelis (Acutoodescelis) punctatissima emmerichi Kaszab, 1940

- Elytral punctures smaller than those on pronotum but much sparser; base of parameres more parallel laterally ( Fig. 17 ).......................................... Oodescelis (Acutoodescelis) punctatissima henanana Bai & Ren , subsp. nov.

6. Protibiae club-shaped (basal half thin, widening into club-shaped from middle to apex) ( Figs. 5–6 ); parameres nearly as long as phallobase (subgenus Clavatoodescelis )................................................................. 7

- Protibiae evenly widening from base to apex ( Figs. 7–8, 10 ); or protibiae axe-shaped (basal half thin, inner side strongly widening into axe-shaped from middle to apex) ( Figs. 9, 11–14 ); parameres much shorter than phallobase.................... 8

7. Length of the tibial club on protibiae much longer than width in ventral view; apex of parameres strongly hook-liked curved to dorsal side in lateral view ( Fig. 26 )............................ Oodescelis (Clavatoodescelis) oblonga ( Ballion, 1878)

- Length of the tibial club on protibiae nearly as long as width in ventral view; apex of parameres weakly hook-liked curved to dorsal side in lateral view ( Fig. 24 )....................... Oodescelis (Clavatoodescelis) acutanguloides Kaszab, 1940

8. Protibiae evenly widening from base to apex ( Fig. 7 ); parameres not flattened, without longitudinal groove at middle, phallobase without lateral prominences or deep longitudinal groove (subgenus Convexoodescelis ).................................................................... Oodescelis (Convexoodescelis) brevipennis brevipennis (Kaszab, 1938)

- Protibiae axe-shaped ( Figs. 9, 11–14 ); or protibiae evenly widening from base to apex ( Figs. 8, 10 ); parameres flattened, with longitudinal groove at middle, phallobase with lateral prominences and deep longitudinal groove (subgenus Ovaloodescelis ) 9

9. Protibiae evenly widening from base to apex ( Figs. 8, 10 ).................................................... 10

- Protibiae axe-shaped ( Figs. 9, 11–14 ).................................................................... 11

10. Pronotum narrowly depressed along lateral margins from base to middle; inner side of metatibiae weakly curved at middle; outer margins of parameres with sharp hooks at apex in dorsal view ( Fig. 29 ).................................................................................................. Oodescelis (Ovaloodescelis) ovalis ( Ballion, 1878)

- Pronotum not depressed along lateral margins; inner side of metatibiae strongly curved at middle; outer margins of parameres with round hooks at apex in dorsal view ( Fig. 27 )................... Oodescelis (Ovaloodescelis) affinis ( Seidlitz, 1893)

11. Length of the axe shorter than half length of protibiae ( Fig. 14 ); outer margins of parameres with round hooks at apex in dorsal view ( Fig. 37 )............................................... Oodescelis (Ovaloodescelis) tibialis ( Ballion, 1878)

- Length of the axe as long as half length of protibiae ( Figs. 9, 11–13 ); outer margins of parameres with obtuse or sharp hooks at apex in dorsal view ( Figs. 31, 33, 35 ).................................................................... 12

12. Outer margins of parameres with short and obtuse hooks at apex in dorsal view ( Figs. 33, 35 )........................ 13

- Outer margins of parameres with long and sharp hooks at apex in dorsal view ( Fig. 31 )............................. 14

13. Pronotum wider, not flattened laterally, depressed along lateral margins between base and middle; parameres long, narrowing forward from middle laterally ( Fig. 33 )..................... Oodescelis (Ovaloodescelis) similis similis (Kaszab, 1938)

- Pronotal disc more convex, weakly flattened laterally, not depressed along lateral margins; parameres short, narrowing forward from base laterally ( Fig. 35 )................................. Oodescelis (Ovaloodescelis) subattenuata Egorov, 1991

14. Parameres long, apex hook-liked curved to dorsal side in lateral view.. Oodescelis (Ovaloodescelis) heydeni ( Seidlitz, 1893)

- Parameres short, apex not hook-liked curved to dorsal side in lateral view ( Figs. 31–32 ).................................................................................... Oodescelis (Ovaloodescelis) pseudotibialis Skopin, 1973

Figures

FIGURES 31–42. Parameres of male aedeagus in dorsal and lateral view. 31–32. Oodescelis pseudotibialis; 33–34. O. similis similis; 35–36. O. subattenuata; 37–38. O. tibialis; 39–40. O. kansouensis; 41–42. O. lii.

FIGURES 15–30. Parameres of male aedeagus in dorsal and lateral view. 15–16. Oodescelis punctatissima emmerichi; 17–18. O. punctatissima henanana; 19–20. O. punctatissima punctatissima; 21–22. O. pyripenis; 23–24. O. acutanguloides; 25–26. O. oblonga; 27–28. O. affinis; 29–30. O. ovalis.

FIGURES 5–14. Male protibiae. 5. Oodescelis acutanguloides; 6. O. oblonga; 7. O. brevipennis brevipennis; 8. O. affinis; 9. O. heydeni; 10. O. ovalis; 11. O. pseudotibialis; 12. O. similis similis; 13. O. subattenuata; 14. O. tibialis.