. "The maiden rocksnail, scientific name \u2020Leptoxis formosa, was a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae.This species was endemic to the United States. It is now extinct."@en . . . . . . "EX" . "IUCN2.3" . "Maiden rocksnail"@en . .