Archaeotrogon

They were initially thought be prehistoric trogon. However, it is nowadays generally believed that they are not very closely related to these tropical forest birds of our time, but rather convergent. The Archaeotrogonidae actually seem to be Cypselomorphae and related to nightjars and hummingbirds, either as a basal lineage or as a distinct but entirely extinct family. The latter might be more justified than with other indeterminate Cretaceous and Paleogene modern birds: they are known from a time when the living cypselomorph families were already distinct, yet appears as well highly autapomorphic and the archaeotrogonid lineage seems to go as far back as that of nightjars for example. A 2021 phylogenetic analysis constrained to molecular results found them to be the sister group to nightjars.