Discus is a genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Discidae, the disk snails.
Anguispira is a genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Discidae, the disk snails.
Mitra is a large genus of medium to large predatory sea snails, marine gastropod mollusks in the family Mitridae, the miter shells or mitre snails.
The excised slitshell, scientific name †Gyrotoma excisa, was a species of freshwater snail, an aquatic gastropod mollusk in the family Pleuroceridae. This species was endemic to the United States. It is now extinct.
The striate slitshell, scientific name Gyrotoma lewisii, was a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species was endemic to the United States. It is now extinct.
The pagoda slitshell, scientific name †Gyrotoma pagoda, was a species of freshwater snail, a gastropod in the family Pleuroceridae. This species was endemic to the United States. It is now extinct.
The ribbed slitshell, scientific name Gyrotoma pumila, was a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae family. This species was endemic to the United States.
The pyramid slitshell, scientific name Gyrotoma pyramidata, was a species of freshwater snail, a gastropod in the Pleuroceridae family. It was endemic to the United States. It is now extinct.
The round slitshell, scientific name Gyrotoma walkeri, is an extinct species of freshwater snail, an aquatic gastropod mollusk in the family Pleuroceridae. This species was endemic to the United States.
Leptoxis is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Pleuroceridae.
Obovaria is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels. There are at least six described species in Obovaria at present, all of which are found in the United States. Obovaria subrotunda is found in Canada as well.
Stagnicola is a genus of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Lymnaeidae, the pond snails.
Streptostyla is a genus of predatory, air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Spiraxidae.
Pleuroceridae, common name pleurocerids, is a family of small to medium-sized freshwater snails, aquatic gilled gastropod mollusks in the superfamily Cerithioidea.These snails have an operculum and typically a robust high-spired shell.
Parafossarulus is a genus of freshwater snails with gills and an operculum, an aquatic prosobranch gastropod mollusks in the family Bithyniidae.
Thiara is a genus of freshwater snails, aquatic gastropod mollusks in the family Thiaridae.
Stenomelania is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Thiaridae known as thiarids.
Jagora is a genus of freshwater snails which have an operculum, aquatic gastropod mollusks in the family Pachychilidae.
Rotundaria is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels.
