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Taxonomy > Arcidae > Acar < Previous species - Next species > (within the family) Acar gradata (Broderip & Sowerby I, 1829) Keen (1971) Sea shells of tropical West America. Marine Mollusks from Baja California to Peru. - p. 40 Huber (2010) Compendium of Bivalves. A Full-Color Guide to 3'300 of the World's Marine Bivalves. A Status on Bivalvia after 250 Years of Research. - p. 130 Coan & Valentich-Scott (2012) Bivalve Seashells of Tropical West America. Marine Bivalve Mollusks from Baja California to Northern Peru. - p. 161 Gurgo Salice & Cáceres (2021) Baja Californian sea shells. - p. 210 Statistics Frequency occasional - 21 localities (10.66 %) Sediment 63 (0 fine >> 100 coarse sediment) Size and comments The literature indicates a maximum length of 37mm; beach finds from the Gulf remain below 30mm. Images Length 19.6mm. Taxonomy > Arcidae > Acar < Previous species - Next species > (within the family)