Coelometoponini, Perkins, 2005

Perkins, Philip D., 2005, A revision of the African hygropetric genus Coelometopon Janssens, and description of Oomtelecopon new genus (Coleoptera: Hydraenidae), Zootaxa 949 (1), pp. 1-103 : 1-103

Key to Genera and Species of Coelometoponini

1. Lateral margin of elytron formed by granules on prominently raised 8th interval (pseudoepipleuron) (Fig. 7); females with fringe of strong spines on last tergite; strongly granulate, moderately setose species................................... Coelometopon Janssens 3

­ Lateral margin of elytron not formed by pseudoepipleuron of 8th interval; females last tergite without spines; weakly granulate, very strongly setose species with large callosity in front of each eye (Figs. 1, 2) ............................... Oomtelecopon new genus 2

2. Elytra humped at abrupt posterior declivity which at summit on 2nd interval bears large, very setose callosity; more strongly setose, smaller ca. 2.23 mm (Fig. 3)............ ........................................................................................................... O. setosum n. sp.

­ Each elytron with 9 or 10 callosities; flatter species, not humped at posterior declivity, callosities at summit not larger than other callosities; less strongly setose, larger ca. 2.85 mm (Fig. 5).............................................................................. O. sebastiani n. sp.

3. Large species, ca. 2.50–4.50 mm; clypeus anterior angles rounded; labrum very short, mostly hidden beneath clypeus; pronotum lateral depressions very wide; Tanzania.... 4

­ Smaller species, ca. 2.00– 2.70 mm; labrum longer, not hidden, males often with cluster of large setae on each side (Fig. 58); clypeus anterior angles rounded or not; pronotum lateral depressions not as wide; South Africa and Zimbabwe............................... 7

4. Pronotum with median groove delimited on each side by granulate ridge ................... 5

­ Pronotum with midlongitudinal ridge in anterior 1/2, fovea in posterior; markedly sexually dimorphic species (Figs. 44, 45) ............................................. C. leleupi Janssens

5. Size larger, ca. 3.40–4.5 mm; pronotum lateral margins armed with large, sharp tubercles; elytral odd­numbered intervals each with unilinear row of granules (Fig. 47) ...... .................................................................................................... C. madidum Janssens

­ Size smaller, ca. 2.50–3.20 mm; pronotum lateral margin with small granules about equal in size to granules on disc; elytra with at least some odd­numbered intervals non­granulate, shining................................................................................................... 6

6. Median groove delimited on each side by unilinear row of granules on ridge; smaller species, ca. 2.50 mm, with distinctive piceous punctures on otherwise reddish­brown elytra (Fig. 49)............................................................................. C. cavifrons Janssens

­ Median groove delimited on each side by band of granules; larger species, ca. 3.11 mm, more robust; dorsum piceous(Fig. 51) .................................. C. kilimanjaro n. sp

7. Pronotum markedly fimbriate laterally; clypeus anterior angles broadly rounded; mentum with large median depression; males with labrum simple (Fig. 7) .......................... ...................................................................................................... C. fimbriatum n. sp.

­ Pronotum granulate laterally, not fimbriate; clypeus anterior angles not as broadly rounded; mentum with depression on each side of midline; males with cluster of erect setae on each side of labrum near anterior angles of clypeus (Fig. 58); ( endroedyi Group) ....................................................................................................................................... 8

8. Pronotum with large non­granulate areas; elytra non­granulate on basal 1/4 of 1st and 3rd intervals, at least ..................................................................................................... 9

­ Pronotum nearly uniformly densely granulate, lacking large non­granulate areas; elytral odd­numbered intervals granulate......................................................................... 12

9. Elytra with 1st and 3rd intervals non­granulate, shining ............................................ 10

­ Elytra with at least posterior portions of 1st and 3rd intervals granulate.................... 11

10. Elytra with 5th interval non­granulate; odd­numbered intervals wider, costate portions of even­numbered intervals more pronounced; elytra brown, head and pronotal disc darker (Fig. 12).................................................................................. C. costatum n. sp.

­ Elytra with 5th interval partially granulate; odd­numbered intervals narrower, costate portions of even­numbered intervals less pronounced; piceous to black; pronotum with sides markedly emarginate in front of widest part (Fig. 13)... C. emarginatum n. sp.

11. Pronotum with sides weakly emarginate behind widest part, disc more convex, median groove deeper, narrower, and more uniform in width; female last tergite bilobate (Fig. 9) ........................................................................................................ C. endroedyi n. sp.

­ Pronotum with sides straight behind widest part, disc less convex, median groove widened anteriorly; female last tergite not bilobate (Fig. 34) ........ C. langebergense n. sp.

12. Elytra with ground sculpture of micropores................................................................ 13

­ Elytra without micropore ground sculpture ................................................................ 14

13. Pronotum with sides roundly produced at widest part, cordiform (Fig. 30) ................... .................................................................................................. C. minipunctum n. sp.

­ Pronotum angulate at widest part ................................................................................ 14

14. Granules on margin of elytron (pseudoepipleuron) closely spaced, separated from one another by less than granule width; body narrower; aedeagus as figured (Figs. 40, 41) ..................................................................................................... C. granulatum n. sp.

­ Granules on elytral margin more widely spaced; body slightly wider; aedeagus as figured (Figs. 42, 43) ...................................................................... C. mussardi Janssens.

15. Pronotum with sides roundly produced at widest part................................................. 16

­ Pronotum with sides angulate at widest part ............................................................... 18

16. Pronotum cordiform, not emarginate in front of widest part (Fig. 23) ........................... ....................................................................................................... C. coronatum n. sp

­ Pronotum markedly emarginate in front of widest part .............................................. 17

17. Elytral 7th interval with unilinear row of granules interrupted at depression in basal 1/ 3, below which 8th interval widened, thickened and multi­granulate; body larger and wider, elytra more robust and longer, body length/elytral length as 256/167 (Fig. 17) .............................................................................................................. C. brincki n. sp.

­ Elytron slightly depressed in basal 1/3 of 7th interval, but 7th interval with non­interrupted unilinear row of granules, and 8th interval not thickened, margin with unilinear row of granules; body less robust, elytra shorter, body length/elytral length as 241/152 (Fig. 38)........................................................................................... C. natalensis n. sp.

18. Pronotum with sides straight behind widest part ........................................................ 19

­ Pronotum with sides emarginate behind widest part................................................... 20

19. Clypeus set at an angle to plane of frons disc; dorsum bicolored, head and pronotum piceous, elytra brown; elytral punctures large; male labrum smaller (Fig. 15) .............. ................................................................................................... C. punctipennis n. sp.

­ Clypeus disc below plane of frons disc, but not set at an angle; dorsum piceous; eyes slightly larger when compared to interocular width; male labrum larger, broadly arcuate laterally, apicomedian notch deep (Fig. 31) ..................... C. balfourbrownei n. sp.

20. Elytral 2nd interval with first costate area subequal to or smaller than second costate area ..................................................................................................................................... 21

­ Elytral 2nd interval with first costate area more prominent than second costate area 22

21. Elytra with granules of 2nd, 4th and 6th intervals subequally prominent over posterior declivity (Fig. 25) ..................................................................... C. clandestinum n. sp.

­ Elytra with granules over posterior declivity more prominent on 2nd and 4th intervals than on 6th interval (Fig. 27).......................................................... C. blinkwater n. sp.

22. Aedeagus not strongly sinuate; females with last tergite strongly bilobate (Figs. 36, 37) ................................................................................................................. C. zulu n. sp.

­ Aedeagus strongly sinuate; females with last tergite bilobate or arcuate ................... 23

23. Aedeagus as illustrated; females with last tergite strongly bilobate (Figs. 21, 22)......... ............................................................................................ C. drakensbergensis n. sp.

­ Aedeagus as illustrated; females with last tergite arcuate (Figs. 19, 20) ........................ ...................................................................................................... C. angulatum n. sp.