Dragonflies (Odonata) From The Sierras Of Tapirapeco And Unturan, In The Extreme South Of Venezuela Author DeMarmels, Jurg text Acta Biologica Venezuelica 1992 14 1 57 78 journal article 10.5281/zenodo.3266063 39c9ce8d-d95d-467e-9590-ab184d952201 3266063 Rimanella arcana Needham, 1933 Material. 3♂ , 1 ♀ , Unturan Remarks. An additional female was observed at the same place, perhaps ovipositing into some roots hanging over the creek. The water here was flowing rapidly over a steep rocky bottom.