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This is a list of the gastropods found on the island of St. Helena.
Family Achatinidae
Genus Chilonopsis (†)
- Chilonopsis blofeldi (†)
- Chilonopsis exulatus (†)
- Chilonopsis helena (†)
- Chilonopsis melanoides (†)
- Chilonopsis nonpareil - Great Saint Helena awl snail (†)
- Chilonopsis subplicatus (†)
- Chilonopsis turtoni (†)
Family Charopidae
Genus Helenoconcha
- Helenoconcha leptalea (†)
- Helenoconcha minutissima (†)
- Helenoconcha polyodon (†)
- Helenoconcha pseustes (†)
- Helenoconcha relicta - Ammonite snail
- Helenoconcha sexdentata (†)
Genus Helenodiscus (†)
- Helenodiscus bilamellata (†)
- Helenodiscus vernoni - Wollaston's Saint Helena Discus snail (†)