Pneuminion

Perkins, Philip D., 2004, A revision of the South African endemic water beetle genus Pneuminion Perkins (Coleoptera: Hydraenidae), Zootaxa 538, pp. 1-38 : 5-6

Key to Species of Pneuminion

1 Pronotal foveae deeply impressed and wide; elytra with saddle, each elytron with five unilinear, subcostate rows of setae ( Figs. 11 ) .................................... impressum n. sp.

­ Pronotal foveae not deeply impressed; elytra not subcostate........................................ 2

2 Elytra with setae of serial punctures and setae of intervals each forming unilinear, uninterrupted lines, about 18 narrowly spaced rows on each elytron ........................... 3

­ Elytral intervals each with unilinear row of setae, setae of series less developed, setae not overlapping, not forming discrete line as on intervals ............................................ 5

3 Elytral setal bases lacking perceptible granules, elytra more shining ( Fig. 5 )................ .................................................................................................................. tubum n. sp.

­ Elytral setal bases each with a distinct granule on anterior margin .............................. 4

4 Dorsum black, setae more developed, whitish; pronotal foveae rugulose, micropunctulate, and with granules ( Fig. 2 )........................................................... velamen Perkins

­ Dorsum dark brown or brown, setae less developed, testaceous; pronotal fovea punctate, punctures each divided by a granule, therefore appearing paired ( Fig. 3 ) ............. .............................................................................................................. endroedyi n. sp.

5 Pronotal reliefs with interpunctal surfaces smooth, shining ......................................... 6

­ Frons disc and pronotal reliefs dull............................................................................... 8

6 Size small, ca. 1.30 mm long; interpunctal surfaces of frons disc smooth and shining ( Fig. 10 ).................................................................................................... nanum n. sp.

­ Size larger, ca. 1.50­2.00 mm; frons shining or dull ..................................................... 7

7 Pronotal foveae subrugulose, deeper ( Fig. 6 )...................................... natalensis n. sp.

­ Pronotal disc more uniformly punctate, foveae punctate, shallower, especially anteromedian fovea ( Figs. 1 , 9 ).................................................................... punctatum n. sp.

8 Elytra semisulcate, intervals raised slightly; elytra longer, ca. 3x as long as length of pronotum, ratio as 37/111 ( Figs. 7 , 8 ) semisulcatum n. sp.

­ Elytral intervals less raised; pronotal U­shaped fovea deeper; elytra shorter, ratio of lengths of pronotum and elytra as 37/100 ( Fig. 4 ) ...................... balfourbrownei n. sp.

Figures

FIGURE 1. Pneuminion punctatum holotype. Structures and sculpture.

FIGURE 2. Pneuminion velamen holotype. Dorsal and lateral habitus.

FIGURE 3. Pneuminion endroedyi holotype. Dorsal and lateral habitus.

FIGURE 4. Pneuminion balfourbrownei holotype. Dorsal and lateral habitus.

FIGURE 5. Pneuminion tubum holotype. Dorsal and lateral habitus.

FIGURE 6. Pneuminion natalensis holotype. Dorsal and lateral habitus.

FIGURE 7. Pneuminion semisulcatum holotype. Dorsal and lateral habitus.

FIGURE 8. Pneuminion semisulcatum holotype. Ventral habitus.

FIGURE 9. Pneuminion punctatum holotype. Dorsal and lateral habitus.

FIGURE 10. Pneuminion nanum holotype. Dorsal and lateral habitus.

FIGURE 11. Pneuminion impressum holotype. Dorsal and lateral habitus.