Dragonflies (Odonata) From The Sierras Of Tapirapeco And Unturan, In The Extreme South Of Venezuela DeMarmels, Jurg Acta Biologica Venezuelica 1992 14 1 57 78 4BKDZ Geijskes, 1976 Geijskes 1976 [1272,2028,889,926] Insecta Megapodagrionidae Oxystigma Animalia Odonata 3 60 Arthropoda species williamsoni  Material.  3♂, 5 ♀, Base Camp 2433522136 [1506,1896,940,979] 1989-02-14 1989-03-06 1989-02-14 MIZA J. DeMarmels & A. Chacon Venezuela 160 2.036111 Base Camp and surroundings, on the upper Rio Mavaca, left bank 21 -65.113884 3 60 8 5 3 Amazonas