Palaeozygopleuridae is an extinct taxonomic family of fossil sea snails, marine gastropod molluscs.

Tornus is a genus of fossil sea snails, marine gastropod mollusks in the family Tornidae.

- Bembexia is a genus of fossil sea snails, marine gastropod mollusks.

Cortinellidae is an extinct taxonomic family of fossil sea snails.

Planitrochidae is an extinct family of fossil sea snails, Paleozoic gastropod mollusks.

Trochactaeon is an extinct genus of fossil sea snails, marine gastropod mollusks in the family Acteonellidae.

This family is not to be confused with the family of fossil sea snails with a similar name, Craspedostomatidae.

Pileolidae is an extinct family of fossil sea snails, marine gastropod mollusks.

Clisospiroidea is an extinct taxonomic superfamily of fossil sea snails, marine gastropod molluscs.

Perunelidae is an extinct family of fossil sea snails, marine gastropod mollusks in the clade Caenogastropoda.

Palaeozygopleuridae is an extinct taxonomic family of fossil sea snails, marine gastropod molluscs.

Tornus is a genus of fossil sea snails, marine gastropod mollusks in the family Tornidae.

- Bembexia is a genus of fossil sea snails, marine gastropod mollusks.

Cortinellidae is an extinct taxonomic family of fossil sea snails.

Planitrochidae is an extinct family of fossil sea snails, Paleozoic gastropod mollusks.

Trochactaeon is an extinct genus of fossil sea snails, marine gastropod mollusks in the family Acteonellidae.

This family is not to be confused with the family of fossil sea snails with a similar name, Craspedostomatidae.

Pileolidae is an extinct family of fossil sea snails, marine gastropod mollusks.

Clisospiroidea is an extinct taxonomic superfamily of fossil sea snails, marine gastropod molluscs.

Perunelidae is an extinct family of fossil sea snails, marine gastropod mollusks in the clade Caenogastropoda.