The nematocerous family Nymphomyiidae is considered by some one of the most primitive groups of true Diptera (Griffiths, 19xx). The primarily aquatic adults have a thrips-like body and are found in the boreal regions of the globe. Three extant genera are known: Palaeodipteron Ide, Felicitomyia Kevan & Cutten, and Nymphomyia Tokunaga.

Undetermed specimens of the first fossil nymphomyiids have been found in Baltic and Bitterfeld amber (Hoffeins & Hoffeins, 1995). Their full description is forthcoming.