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Taxonomy > Calyptraeidae > Crepidula < Previous species - Next species > (within the family) Crepidula onyx Sowerby I, 1824 Keen (1971) Sea shells of tropical West America. Marine Mollusks from Baja California to Peru. - p. 460 Skoglund (2002) Panamic province molluscan literature: additions and changes from 1971 through 2000. III Gastropoda. - p. 73 Paredes & Cardoso (2007) La familia Calyptraeidae en Perú (Gastropoda: Caenogastropoda). - p. 178 Berschauer & Clark (2018) Sea Shells of Southern California. Marine Shells of the Californian Province. - p. 54 Collin (2019) Calyptraeidae from the northeast Pacific (Gastropoda: Caenogastropoda). - p. 118 Gurgo Salice & Cáceres (2021) Baja Californian sea shells. - p. 36 Statistics Frequency very common - 110 localities (55.84 %) Sediment 34 (0 fine >> 100 coarse sediment) Size and comments Up to 72mm in length according to the literature; beach finds in the Gulf of California reach about 60mm in length. Images Length 53.3mm. Taxonomy > Calyptraeidae > Crepidula < Previous species - Next species > (within the family)