''Colymbiculus'' is an extinct genus of

loon Loons (North American English) or divers ( British / Irish English) are a group of aquatic birds found in much of North America and northern Eurasia. All living species of loons are members of the genus ''Gavia'', family Gaviidae and order G ...

that lived in Novopskov,

Ukraine Ukraine ( uk, Україна, Ukraïna, ) is a country in Eastern Europe. It is the second-largest European country after Russia, which it borders to the east and northeast. Ukraine covers approximately . Prior to the ongoing Russian invas ...

in the Eocene.

References

Extinct birds of Europe Gaviiformes Eocene birds {{paleo-bird-stub