"The striate slitshell, scientific name Gyrotoma lewisii, 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 . . . . "IUCN2.3" . . "EX" . "Striate slitshell"@en . . . .