[2] These recent changes in the definition of Crepidula are based on both DNA sequence data as well as anatomical work.

Dissections of various calyptraeids show that species that are now placed in Grandicrepidula and Maoricrypta are anatomically very different from the true Crepidula.

In these cases close examination of the mode of development or of DNA data is vital to verify the species identity.

Adults use their large gill to capture microalgae from suspension, but there is some evidence that small juveniles can also use the radula to scrape algae from the substrate.

Crepidula convexa - Native to the east coast of North America and ranging from South Carolina to New England.