Isospiridae
Introduction '''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 (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 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Isospiridae as synonym of Cyrtonellidae within Tergomya, The Paleobiology Database has become adatapted to this unpublished opinion by Wagner. This alternate taxonomy is as: Tergomya, Cyrtonellida, Cyrtonellidae.
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