Cassidulinidae
The Cassidulinidae is a family of Paleocene to recent benthic foraminifera that make up part of the rotaliid superfamily Cassidulinoidea, characterized by calcareous test with biserially arranged chambers in a planispiral coil, at least in the early stage, but which later may uncoil.
The Cassidulinidae includes three subfamilies, the Cassidulininae, Ehrenbergininae, and Orthoplectinae, which contain as many as fourteen genera.