Cover photo by Gerhard Diedericks. Find the Rock Hooktail in the FBIS database (Freshwater Biodiversity Information System) here. Family Gomphidae Identification Medium sized Length reaches 46mm; Wingspan attains 60mm. The overall colour of both sexes is yellow with thick, brownish-black markings. In mature males some of the dark bands on the thorax develop a weak … Continue reading Rock Hooktail (Paragomphus cognatus)