Radicidus, Short, Andrew Edward Z. & García, Mauricio, 2014

Short, Andrew Edward Z. & García, Mauricio, 2014, A new genus of egg case-carrying water scavenger beetle from the Guiana Shield (Coleoptera: Hydrophilidae: Acidocerinae), Zootaxa 3835 (2), pp. 251-262 : 260

Key to species of Radicidus gen. n.

1 Elytra with coarsely punctate striae laterally and in posterior half ( Fig. 4 A). Fifth abdominal ventrite with a glabrous patch apically ( Fig. 6 A). Size slightly larger on average (4.7–6.2 mm)................................................... 2

- Elytra without coarsely punctate striae ( Fig. 4 B). Fifth abdominal ventrite pubescent throughout ( Fig. 6 B). Size smaller, less than 5.0 mm............................................................................ R. granitum sp. n.

2 Glabrous region of fifth ventrite smaller, not exceeding half the width of the ventrite. Parameres each divided into two projections ( Fig. 7 A)......................................................................... R. ayacucho sp. n.

- Glabrous region of the fifth ventrite larger, extending three-fourths the width of the ventrite. Parameres not divided into two projections ( Fig. 7 B)................................................................. R. surinamenesis sp. n.

Figures

FIGURE 4. Elytra of Radicitus spp. A) R. ayacucho, B) R. granitum.

FIGURE 6. Abdominal ventrites of Radicitus spp. A) R. ayacucho, B) R. granitum.

FIGURE 7. Aedeagi of Radicitus spp. A) R. ayacucho, B) R. surinamensis, C) R. cf. granitum (Suriname), D) R. granitum (Venezuela).