 Reports of this species in the Gulf of Mexico or south of North Carolina are incorrect, and result from taxonomic confusion with other flat white species of "Crepidula", including "Crepidula atrasolea", and "Crepidula depressa".In the past, "Crepidula plana" has been reported to range from 48°N to 38°S; 97.75°W to 34.9°W.Much of this distribution information is incorrect, because it has not been updated to reflect the current taxonomic understanding of this group of similar species.