Hygromiidae

Helicodontidae Family Helminthoglyptidae Family Humboldtianidae Family Hygromiidae Family Monadeniidae Family Pleurodontidae Family Polygyridae Family Sphincterochilidae

Helminthoglyptidae Family Humboldtianidae（英语：Humboldtianidae） Family Hygromiidae（英语：Hygromiidae） Family Monadeniidae（英语：Monadeniidae） 高腰蝸牛科 Pleurodontidae Family

Helicodontidae Family Helminthoglyptidae Family Humboldtianidae Family Hygromiidae Family Monadeniidae Family Pleurodontidae Family Polygyridae Family Sphincterochilidae

Halolimnohelicidae Helicodontidae 扁雕蜗牛科（Helminthoglyptidae） Humboldtianidae 嗜石螺科（Hygromiidae） Monadeniidae 肋齿螺科（Pleurodontidae） 多圆螺科（Polygyridae） Sphincterochilidae

species of the Stylommatophoran families Polygyridae, Helicidae and Hygromiidae. These families are only distantly related, suggesting that this features