Trissexodontidae
 Trissexodontidae is a family of air-breathing land snails terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea (according taxonomy of the Gastropoda by Bouchet & Rocroi 2005).This family has no subfamilies. The family Trissexodontidae was separated out from the from families Hygromiidae and Helicodontidae and some authors still classify these species within those families.