Comprised of a single family, and a single genus.
Froggatt, W. W. 1906. Notes on the hymenopterous genus Megalyra Westwood, with descriptions of new species. Proceedings of the Linnean Society of New South Wales 31: 399-407.
Shaw, S. R. 1990. A taxonomic revision of the long-tailed wasps of the genus Megalyra Westwood (Hymenoptera: Megalyridae). Invertebrate Taxonomy 3: 1005-1052.