ApterrinellaCarixiaPlummerinellaRamovsia Calcivertellinae is a subfamily of foraminifera belonging to the order Miliolida.

[1][2] Calcivertellids have been found in Pennsylvanian[3] to Triassic[4] beds and had a cosmopolitan distribution.

[4][5] The calcivertellids are characterized by a porcelain-like test consisting of a single tube, initially forming a spiral but opening out into a zigzag shape.

They live attached to a surface or to other organisms.

This Foraminifera-related article is a stub.