Fluvioviridavis
Fluvioviridavis is an extinct genus of bird from the Early Eocene Green River Formation of Wyoming and London Clay Formation of the United Kingdom. There are three known species: F. platyrhamphus from the Green River and F. michaeldanielsi and F. nazensis from the London Clay. Fluvioviridavis is the only genus currently named in the monotypic family Fluvioviridavidae.