What is "copepteryx"

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 .

The name is derived from the Greek words "Kope pteryx" meaning oar wing. The apparent reference to the 19th Century Paleontologist Edward Drinker Cope is accidental.

Copepteryx was a diving plotopterid bird which is similar to the Waimanu.