found: World register of marine species, via WWW, Dec. 13, 2017(Hydrobiidae. Rank: Family. Superfamily Truncatelloidea, Order Littorinimorpha. Synonymised names: Nymphophilinae, Paludestrinidae, Pyrgulidae; Lithoglyphidae listed separately as an accepted family within Truncatelloidea. Common name: Spring snails) Hydrobia (Common name: mud snails)
found: NCBI taxonomy browser, Dec. 18, 2017(Hydrobiidae. Rank: family. Synonym: Pyrgulidae. Superfamily Truncatelloidea, Infraorder Littorinimorpha, (no rank) Hypsogastropoda, Subclass Caenogastropoda, Class Gastropoda; Lithoglyphidae separately listed another family within Truncatelloidea)
found: Worldwide mollusc species data base, via WWW, Dec. 18, 2017(Family Hydrobiidae. Truncatelloidea [Superfamily] - Littorinimorpha [Order] - Caenogastropoda [Subclass]; family Lithoglyphidae has separate entry)
found: Wikipedia, Dec. 18, 2017(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)
found: Wiktionary, Dec. 18, 2017(hydrobiid (plural hydrobiids): (zoology) Any member of the Hydrobiidae)
