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The currently accepted suprageneric classification of Recent patelloid archaeogastropods is based largely on radula and gill morphology, with relatively little consideration given to the shell….
shell structure, patelloid, bellerophontoid, gastropods
MacClintock, Copeland. 1967. "Shell structure of patelloid and bellerophontoid gastropods (Mollusca)." Bulletin of the Peabody Museum of Natural History , (22). https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/22