The Raphistomatidae is a family of Paleozoic gastropods established by Koken, 1896, whose range extends from the Upper Cambrian to Middle Permian, comprising lentuclar, turbiniform, and stepped shells with a short slit, notch, or sinus on the aperture lip that generally results in a selenizone.

J. Brooks Knight, et al in the Treatise

Treatise on Invertebrate Paleontology

The Treatise on Invertebrate Paleontology published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and covering every phylum, class, order, family, and genus of fossil and...

 Part 1, 1960, included the Raphistomatidae in the Pleurotomariacea

Pleurotomariacea

The superfamily Pleurotomariacea, based on Swainson, 1840 and described in the Treatise on Invertebrate Paleontology, was established for mostly conispiral, but also discoidal and auriform shells that have a nacreous, aragonite, inner layer.The Pleurotomariacea, now often seen as...

 and subdived the family into four subfamilies described herein.

• Opheletinae,Knight,1956-- generally low spired with a wide umbilicus and V-shaped labral sinus ending at the perophery in a short notch that generates an obscure selenizone. U Camb - L Ord

• Raphistomatinae, Koken, 1896 -- consissts of shells commonly with a narrow protruding base and more or less flattened upper surface and a deep v-shaped labral sinus in most species ending in a shallow notch at the end of a peripheral selenezone. M Ord - ?L Carb

• Liospirinae, Knight,1956 - has lentiucal shells with a moderately deep V-shaped sinus resulting in a short slit that generates a convex selinizone found mostly, or entirely, on the upper side. ?L ord - M Perm

• Omospitinae, Wenz,1958 -- contains gradate, that is stepped shells with a ramp and a relativeley wide, shallow sinus or labral slit resulting in a selenizone just within the outer margin of the ramp. M Ord- L Jur (note, range inconsistent with that given for the family)

Jeffery, 2003, included the Raphistomatidae in the Euomphaloidea

Euomphaloidea

Euomphaloidea, originally Euomphalacea, is an extinct superfamily of marine molluscs that lived from the Early Ordovician to the Late Cretaceous, included in the Gastropoda but speculated as instead perhaps Monoplacophora.-Description:...

 (=Euomphalacea). The subfamilies Opheletinae and Raphistomatinae are retained, but the Lionsprinae and Omospirinae have be reassigned to the Eotomaridae and Loxonematidae

Loxonematidae

Loxonematidae is an extinct taxonomic family of sea snails, marine gastropod molluscs.This family has no subfamilies....

, respectivley.

In the perspective of Bouchet and Rocroi, 2005 the Raphistomatidae is simply included in "Basal taxa that are certainly Gastropoda" without assigning it to any higher taxa.