Genus Planocarina Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara, 2016
Diagnosis: Test elongated-pyriform, with a distinct neck, lateral margins tapering towards the aperture. A ﬂat keel surrounds the entire posterior part of the test. Test hyaline or slightly yellowish, composed of circular to elongated shell plates probably recycled from euglyphid testate amoeba prey.
Differential diagnosis: See diagnosis of Gibbocarina.
Type species: Planocarina carinata (Archer 1867) Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara 2016.
Included taxa: All former Nebela species with a ﬂat keel, such as: N. carinata, N. marginata, N. maxima and N. spumosa, but excluding those with a lateral horn (i.e. the genus Cornutheca).