Nososticta taracumbi is a species of Australian damselfly in the family Platycnemididae, commonly known as a Melville Island threadtail. It is endemic to Melville Island, Northern Territory, where it inhabits streams.
Nososticta taracumbi is a small, slender damselfly, coloured black with bright blue and white markings in the male, and ochre-like colouring in the female. Wings have a brown-yellowish tinge.