 "Theodoxus" species living in brackish water include "Theodoxus fluviatilis" and "Theodoxus jordani", but they are apparently not closely related.The exact type locality for this species is unknown, but it is probably the Main river in Southern Germany.Glöer (2002) considered the type locality sensu Linnaeus as ""Habitat in fluviis, Upsaliae ad molendinam Ulvam & alibi"", but this would suggest a brackish water environment.