Planorbidae, common name the ramshorn snails or ram's horn snails, is a family of air-breathing freshwater snails, aquatic pulmonate gastropod molluscs. Unlike most molluscs, the blood of ram's horn snails contains iron-based hemoglobin instead of copper-based hemocyanin. As a result, planorbids are able to breathe oxygen more efficiently than other molluscs. The presence of hemoglobin gives the body a reddish colour. This is especially apparent in albino animals.
Bithyniidae is a family of small freshwater snails with an operculum, aquatic gastropod molluscs in the clade Littorinimorpha.
Anceya is a genus of tropical freshwater snails with an operculum, aquatic gastropod mollusks in the family Paludomidae.
Cleopatra ferruginea is a species of freshwater snails with an operculum, aquatic gastropod molluscs in the family Paludomidae.
Coelatura is a genus of bivalve in the Unionidae family.
Ferrissia is a genus of small, air-breathing freshwater limpets, aquatic gastropod mollusks in the family Planorbidae, the ram's horn snails and their allies.
Lanistes is a genus of freshwater snails which have a gill and an operculum, aquatic gastropod mollusks in the family Ampullariidae, the apple snails.
Melanoides is a genus of freshwater snail with an operculum, an aquatic gastropod mollusk in the subfamily Thiarinae of the family Thiaridae.
Subulina is a genus of small tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Achatinidae.
Syrnolopsis is a genus of medium-sized freshwater snails with an operculum, aquatic gastropod mollusks in the family Paludomidae.
Streptaxidae is a family of carnivorous air-breathing land snails, terrestrial pulmonate gastropod mollusks in the clade Stylommatophora. Six Streptaxidae subfamilies are accepted in the 2005 taxonomy of the Gastropoda by Bouchet & Rocroi.
Urocyclidae is a family of air-breathing land snails, semi-slugs and land slugs, terrestrial pulmonate gastropod mollusks in the superfamily Helicarionoidea,.
Paludomidae, common name paludomids, is a family of freshwater snails, gastropod molluscs in the clade Sorbeoconcha.
Stanleya is a genus of freshwater snails, aquatic gastropod molluscs in the family Paludomidae.
Pseudocleopatra broecki is a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Paludomidae.
Cleopatra bulimoides is a species of freshwater snails with an operculum, aquatic gastropod molluscs in the family Paludomidae.
Pseudocleopatra is a genus of freshwater snails in the family Paludomidae.
Pettancylus is a genus of air-breathing freshwater snails, pulmonate gastropod mollusks in the subfamily Ancylinae of the family Planorbidae.
Potadoma is a genus of gastropods belonging to the family Pachychilidae.
