What is "involutinidae"

Involutinidae is a family of foraminiferal protozoans included in the Involutinida, is characterized by calcareous tests consisting of an undivided planispirally to trochospirally coiled tubular second chamber wound around the initial proloculus, and which may have thickenings or nodes on one or both sides. Includes four subfamilies, Aulotortinae, Involutininae, Triadodiscinae, and Triasininae.

The Involutinidae were previously included in the in the Treatise on Invertebrate Paleontology Part C, 1964.