Cover photo by Chris Willis. Find the Common Thorntail in the FBIS database (Freshwater Biodiversity Information System) here. Family Gomphidae Identification Medium-large size Length up to 53mm; Wingspan attains 69mm. The Common Thorntail is most similar to the Cape Thorntail (Ceratogomphus triceraticus), but is smaller and paler. Ceratogomphus pictus has thin black edging on the … Continue reading Common Thorntail (Ceratogomphus pictus)