Euomphalus J. de C. Sowerby, 1814 - type genus - synonyms: Phymatifer, Schizostoma, Paromphalus.
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Euomphalidae is an extinct family of Paleozoic marine molluscs which may be gastropods with anisostrophically coiled shells (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).
Amphiscapha is a fossil gastropod mollusk, or less likely a monoplacophoran, genus from the Pennsylvanian and Lower Permian of North and South America, included in the family Euomphalidae.