The Tumbling Creek cavesnail is a species of freshwater cave snail with gills and an operculum, an aquatic gastropod mollusk in the family Amnicolidae.
The Blue Spring aphaostracon or Blue Spring hydrobe, scientific name Aphaostracon asthenes, is a species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Cochliopidae.
Aphaostracon is a genus of very small or minute freshwater snails in the family Cochliopidae that have an operculum.
The dense hydrobe, scientific name Aphaostracon pycnum, is a species of small freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Cochliopidae.
Cincinnatia is a genus of very small freshwater snails that have an operculum, aquatic gastropod molluscs in the family Hydrobiidae, the mud snails.
Coahuilix is a genus of small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Cochliopidae.
Cochliopidae is a family of small freshwater snails with gills and an operculum, aquatic gastropod mollusks.
Pomatiopsidae is a family of small, mainly freshwater snails, that have gills and an operculum, aquatic gastropod mollusks in the superfamily Truncatelloidea.
Lithoglyphidae is a family of small freshwater snails with gills and an operculum, aquatic gastropod mollusks.
Heleobia is a genus of small freshwater and brackish water snails with a gill and an operculum, aquatic gastropod mollusks in the family Cochliopidae and the superfamily Truncatelloidea.
Ecrobia truncata, common name the truncated marsh hydrobia or minute hydrobia, is a species of very small aquatic snail, an operculate gastropod mollusk in the family Hydrobiidae.
Littoridinops palustris is a species of very small aquatic snail, an operculate gastropod mollusk in the family Hydrobiidae.
Onobops crassus is a species of very small aquatic snail, an operculate gastropod mollusk in the family Hydrobiidae.
Pyrgophorus platyrachis is a species of very small aquatic snail, an operculate gastropod mollusk in the family Hydrobiidae.
Spurwinkia salsa is a species of very small aquatic snail, an operculate gastropod mollusk in the family Cochliopidae.
Littoridinops is a genus of very small aquatic snails, operculate gastropod mollusks in the family Hydrobiidae.
Onobops is a genus of very small aquatic snails, operculate gastropod mollusks in the family Cochliopidae or in the Hydrobiidae.
Ecrobia is a genus of very small aquatic snails, operculate gastropod mollusks in the family Hydrobiidae.
Potamolithus is a genus of small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Tateidae.
Floridobia is a genus of very small freshwater snails that have an operculum, in the family Hydrobiidae, the mud snails.
