Megalagrion is a genus of damselflies in the family Coenagrionidae. It contains approximately 26 species, all of which are endemic to Hawaii. Nymphal Megalagrion live in widely diverse habitats, including the expected streams and pools. Megalagrion also exploit some surprising habitats such as plant leaf axils, waterfall faces, and even damp fern litter far from water sources. M. oahuense is the only species of damselfly whose naiad is terrestrial, living in damp fern litter until metamorphosis. Many species of Megalagrion are in danger due to habitat loss and predation by non-native fish. To protect them, non-native fish should never be released in Hawaiian streams. The genus contains the following species: Megalagrion adytum - adytum swamp damselfly Megalagrion amaurodytum Megalagrion blackburni Megalagrion calliphya Megalagrion deceptor Megalagrion dinesiotes Megalagrion eudytum Megalagrion hawaiiense Megalagrion heterogamias Megalagrion jugorum - Maui upland damselfly, (Maui, Critically Endangered) Megalagrion kauaiense Megalagrion koelense - Koele mountain damselfly Megalagrion leptodemas - crimson Hawaiian damselfly Megalagrion mauka Megalagrion molokaiense - Molokai damselfly Megalagrion nesiotes - flying earwig Hawaiian damselfly Megalagrion nigrohamatum - nigrohamatum damselfly Megalagrion oahuense - Oahu damselfly Megalagrion oceanicum - oceanic Hawaiian damselfly Megalagrion oresitrophum Megalagrion orobates Megalagrion pacificum - Pacific Hawaiian damselfly Megalagrion paludicola - Kauai bog damselfly Megalagrion vagabundum Megalagrion williamsoni Megalagrion xanthomelas - orangeblack Hawaiian damselfly References Coenagrionidae Endemic fauna of Hawaii Taxa named by Robert McLachlan (entomologist) Zygoptera genera