Claim: Endemic to Japan during the Oligocene living from 28.4—23 mya, Copepteryx is an extinct genus of the extinct family Plotopteridae within the kingdom Animalia.
Evidence: Copepteryx is an extinct genus of flightless bird of the family Plotopteridae, endemic to Japan during the Oligocene living from 28.4—23 mya, meaning it existed for approximately million years. Genus: †Copepteryx
Olson & Hasegawa, 1996 Family: †Plotopteridae Kingdom: Animalia