Mesogastropoda was for many years a traditional taxonomic group of snails, an order. The order was composed mostly of sea snails, but it also included some land snails and freshwater snails, all of which were prosobranch gastropod mollusks.
Oncomelania hupensis is a species of very small tropical freshwater snail, an aquatic gastropod mollusk in the family Pomatiopsidae.
Hydrobiidae, commonly known as mud snails, is a large cosmopolitan family of very small freshwater and brackish water snails with an operculum; they are in the order Littorinimorpha.
The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles a toy spinning top.
Latia neritoides is a species of small freshwater snail or limpet, an aquatic gastropod mollusc in the family Latiidae.
Madagasikara spinosa is a species of tropical freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Pachychilidae.
Gillia altilis, common name the Buffalo pebblesnail, is a species of freshwater snail, an aquatic gastropod mollusk with an operculum in the family Lithoglyphidae.
Pomatiopsidae is a family of small, mainly freshwater snails, that have gills and an operculum, aquatic gastropod mollusks in the superfamily Truncatelloidea.
Neotricula aperta is a species of freshwater snail, an aquatic gastropod mollusk in the family Pomatiopsidae.
Lacuna vincta, commonly known as northern lacuna, wide lacuna, northern chink shell, or banded chink shell, is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles. It is found intertidally and in shallow waters in both the northern Atlantic Ocean and the northern Pacific Ocean. It is a herbivore, feeding on seaweed and diatoms with its toothed radula.
Blanfordia is a genus of terrestrial gastropod mollusks in the family Pomatiopsidae. They are land snails which have an operculum.
Blanfordia bensoni is a species of land snail which has an operculum, a terrestrial gastropod mollusk in the family Pomatiopsidae.
Fukuia integra, also known as Blanfordia integra, is a species of land snail which has an operculum, a terrestrial gastropod mollusk in the family Pomatiopsidae.
Fukuia is a genus of amphibious freshwater snails and land snails with an operculum, gastropod mollusks in the family Pomatiopsidae.
Erhaia is a genus of small to minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Amnicolidae.
Pomatiopsis is a genus of amphibious snails with gills and an operculum, aquatic freshwater gastropod mollusks in the family Pomatiopsidae.
†Paraprosostenia is a fossil genus of prehistoric freshwater snails, aquatic gastropod mollusks in the family Pomatiopsidae.
Pomatiopsis lapidaria is an amphibious species of snail with gills and an operculum, a gastropod mollusk in the family Pomatiopsidae.
Hubendickia is a genus of freshwater snails with gills and an operculum, aquatic gastropod mollusks in the family Pomatiopsidae.
Faunus ater is a species of brackish water snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.
