Isospiridae is an extinct family of fossil sea snails, Paleozoic gastropod molluscs.
This family is unassigned to superfamily. This family has no subfamilies according to the taxonomy by Bouchet & Rocroi (2005). It is classified as "Basal taxa that are certainly Gastropoda" by Bouchet & Rocroi (2005).
Genera Isospira Koken, 1897 - type genus of the family Isospiridae. Species include:"Isospira". The Paleobiology Database, accessed 26 February 2010. Isospira bucanioides Koken, 1897 Isospira huttoni Cowper Reed, 1921 Isospira lepida Perner, 1903 Isospira nautilina Koken & Perner, 1925 Isospira reinwaldti Öpik, 1930 Isospira reticulatus Wängberg-Eriksson, 1964 - synonym: Isospira reticulata
Taxonomy Peter J. Wagner consider Isospiridae as synonym of Cyrtonellidae within Tergomya,Wagner P. J. (2008). "Paleozoic Gastropod, Monoplacophoran and Rostroconch Database". "Cyrtonellidae" The Paleobiology Database. Accessed 26 February 2010. The Paleobiology Database has become adatapted to this unpublished opinion by Wagner. This alternate taxonomy is as: Tergomya, Cyrtonellida, Cyrtonellidae.
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