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.