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The species Formicium mirabile, named by Theodore D. A. Cockerell in 1920, and Formicium brodiei, named by John O. Westwood in 1854, are both known from fore-wings found in middle Eocene of Bournemouth, Dorset, England.
If Macrodontopteryx is indeed a distinct genus, perhaps some pseudotooth bird fossils found in Lutetian (Middle Eocene, MP11-13, about 45 Ma) deposits at Etterbeek (Belgium) belong therein.
The family is represented in the fossil record by the extinct genus Proaracana with the single species P. dubia known from the Middle Eocene of Italy.
†Eucommia rolandii (Early-Middle Eocene; Mississippi and British Columbia)
Fossils of the Middle Eocene outcrops near Quilchena, British Columbia added to the northern range of the species and are associated with a second species of Eucommia, E. rowlandii.
In 1987, Peters named another monospecific genus of ameghinornithid, Aenigmavis sapea, based on a nearly complete skeleton from the Middle Eocene Messel pit of Germany.