"Turgid riffle shell"@en . "IUCN2.3" . . . . . . "The turgid riffle shell, turgid-blossom naiad, turgid-blossom pearly mussel, or turgid-blossom, scientific name Epioblasma turgidula, was a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.This species was endemic to the United States. It is now extinct."@en . "Dysnomia turgidula Lea, 1858" . . "EX" .