Vertigo geyeri is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusc or micromollusc in the family Vertiginidae, the whorl snails.
Bythiospeum acicula is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum is a genus of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum articense is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum bourguignati is a species of very small freshwater snail that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum bressanum is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum cisterciensorum is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum diaphanum is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum elseri is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum garnieri is a species of very small freshwater snails that have an operculum, aquatic gastropod molluscs in the family Moitessieriidae.
Bythiospeum noricum is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum pfeifferi is a species of very small freshwater snail that has an operculum, an aquatic gastropod mollusk in the family Moitessieriidae.
Bythiospeum quenstedti is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum reisalpense is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum tschapecki is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Bythiospeum klemmi is a species of small brackish water snail with an operculum, an aquatic gastropod mollusk in the family Moitessieriidae.
Moitessieriidae is a family of small freshwater snails, aquatic gastropod molluscs in the superfamily Truncatelloidea.
David Geyer was a German zoologist, malacologist and paleontologist.
