Triacanthagyna is a genus of dragonflies in the family Aeshnidae. The species have large eyes and broad wings. The females have three prominent spines under the last abdominal segment which gives the genus its name. They are commonly known as three-spined darners.
The genus contains the following species:Triacanthagyna caribbea Williamson, 1923 - Caribbean Darner Triacanthagyna dentata (Geijskes, 1943) Triacanthagyna ditzleri Williamson, 1923 Triacanthagyna nympha (Navás, 1933) Triacanthagyna obscuripennis (Blanchard, 1847) Triacanthagyna satyrus (Martin, 1909) Triacanthagyna septima (Selys in Sagra, 1857) - Pale-green Darner Triacanthagyna trifida (Rambur, 1842) - Phantom Darner Triacanthagyna williamsoni von Ellenrieder & Garrison, 2003