OxynooideaOxynooidea is a superfamily of small sea snails, bubble snails and bivalved gastropods, marine gastropod mollusks within the superorder Sacoglossa.FamiliesFamilies within the superfamily Oxynooidea: family Cylindrobullidae Thiele, 1931 family Juliidae E. A. Smith, 1885 family Oxynoidae Stoliczka, 1868 family Volvatellidae Pilsbry, 1895