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- Cephalaspidea: a sub-order of Opisthobranch Gastropod molluscs. They usually possess a reduced internal shell.
- Sacoglossa, a clade of Heterobranch sea slugs and snails which go in for kleptoplasty ('stealing' plastids). They eat algae and keep the chloroplasts for their own use.
- Sea butterflies: a group of pelagic sea snails sometimes called pteropods. They belong to the clade Thecosomata.
- Sea angels, or cliones, are Opisthobranch Gastropod molluscs of the clade Gymnosomata.
- Sea hares are medium to large size marine Gastropod molluscs. They belong to two families of the Opisthobranchia.
- Onchidiidae: a family of air-breathing sea slugs.
It would seem that their similar growth pattern, with the loss of torsion, bilateral symmetry, reduction of the Gastropod shell, and somewhat similar life styles, evolved a number of times in the Gastropods.