Fossil Foraminifera genera

Orbitolina is an extinct genus of foraminifera belonging to the order Textulariida and family Orbitolinidae. Fossils of this genus are widely found in beds deposited in the Tethys Ocean ranging from Aptian (early Cretaceous) to Cenomanian (early Late Cretaceous) in age. It has been used as a shallow carbonate platform facies marker and as a Cretaceous index fossil.

Alveolina is an extinct genus of foraminifera with an elliptical or spherical form.