Isospiridae
Isospiridae is an extinct family of fossil sea snails, Paleozoic gastropod mollusks.
This family is unassigned to superfamily. This family has no subfamilies according to the taxonomy by Bouchet & Rocroi. It is classified as "Basal taxa that are certainly Gastropoda" by Bouchet & Rocroi.Genera
consider Isospiridae as synonym of Cyrtonellidae within Tergomya, The Paleobiology Database has become adatapted to this unpublished opinion by Wagner. This alternate taxonomy is as: Tergomya, Cyrtonellida, Cyrtonellidae.