Subgenus (Laevicardium) W. Swainson, 1840

(3-5-4-0-4-2-4-16-4-0-0-0-0)
Ref. Bernard, 1983 p 38

apicinum P. P. Carpenter, 1864
(3-5-4-0-4-2-4-16-4-1-0-0-0)
[?=Laevicardium (Laevicardium) elenense (G. B. Sowerby, 1840)]
Ref. Abbott, 1974 p 486

? attenuatum (G. B. Sowerby, 1841)
(3-5-4-0-4-2-4-16-4-2-0-0-0)
Attenuated Cockle
Ref. Abbott & Dance, 1982 p 332 c

? biradiatum (J. G. Bruguiere, 1789)
(3-5-4-0-4-2-4-16-4-3-0-0-0)
Two-rayed Cockle
Ref. Abbott & Dance, 1982 p 332 c

clarionense (L. G. Hertlein & A. M. Strong, 1947)
(3-5-4-0-4-2-4-16-4-4-0-0-0)
Ref. Abbott, 1974 p 486
Keen, 1971 p 160 bw
Syn. Cardium (Laevicardium) clarionense L. G. Hertlein & A. M. Strong, 1947
Ref. Bernard, 1983 p 38

elatum (G. B. Sowerby, 1833)
(3-5-4-0-4-2-4-16-4-5-0-0-0)
Giant Eggcockle, Giant Pacific Cockle, Giant Pacific Egg Cockle
Ref. Abbott, 1974 p 486 bw
Abbott & Dance, 1982 p 331 c
Amer. Fish. Soc., 1988 p 39
Keen, 1971 p 160 bw c
Lindner, 1977 pl 60 c
Syn. Cardium (Cardium) elatum G. B. Sowerby, 1833
Ref. Bernard, 1983 p 38

elenense (G. B. Sowerby, 1840)[(1841)]
(3-5-4-0-4-2-4-16-4-6-0-0-0)
Syn. ? Laevicardium (Laevicardium) apicinum P. P. Carpenter, 1864
Ref. Abbott, 1974 p 486
Syn. Cardium (Cardium) apicinum P. P. Carpenter, 1864;
Cardium (Cardium) elenense G. B. Sowerby, 1841;
Laevicardium (Laevicardium) pedernalense H. A. Pilsbry & A. A. Olsson, 1941
Ref. Bernard, 1983 p 38
Syn. Cardium (Cardium) apicinum P. P. Carpenter, 1864
Ref. Keen, 1971 p 160

interrogatorium E. Fischer-Piette, 1977
(3-5-4-0-4-2-4-16-4-7-0-0-0)
[=Clinocardium (Clinocardium) californiense (G. P. Deshayes, 1839)]
Ref. Bernard, 1983 p 39

laevigatum (C. v Linne, 1758)
(3-5-4-0-4-2-4-16-4-8-0-0-0)
Common Egg Cockle, Eggcockle
Ref. Amer. Fish. Soc., 1988 p 39
Syn. Laevicardium (Laevicardium) vitellinum L. A. Reeve, 1844
Ref. Abbott, 1974 p 485 c
Abbott & Dance, 1982 p 331 c

mortoni (T. A. Conrad, 1830)
(3-5-4-0-4-2-4-16-4-9-0-0-0)
Morton Eggcockle, Morton's Egg Cockle
Ref. Abbott, 1974 p 486 bw
Abbott & Dance, 1982 p 331 c

oblongum (J. F. Gmelin, 1791) [T]
(3-5-4-0-4-2-4-16-4-10-0-0-0)
Oblong Cockle
Ref. Abbott, 1974 p 485
Abbott & Dance, 1982 p 331 c

pedernalense H. A. Pilsbry & A. A. Olsson, 1941
(3-5-4-0-4-2-4-16-4-11-0-0-0)
[=Laevicardium (Laevicardium) elenense (G. B. Sowerby, 1841)]
Ref. Bernard, 1983 p 38

pictum (E. Ravenel, 1861)
(3-5-4-0-4-2-4-16-4-12-0-0-0)
Painted Eggcockle, Ravenel's Egg Cockle
Ref. Abbott, 1974 p 486 bw
Abbott & Dance, 1982 p 331 c
Amer. Fish. Soc., 1988 p 39

? rackette (E. Donovan, 1825)
(3-5-4-0-4-2-4-16-4-13-0-0-0)
Rackett's Cockle
Ref. Abbott & Dance, 1982 p 331 c

substriatum (T. A. Conrad, 1837)
(3-5-4-0-4-2-4-16-4-14-0-0-0)
Common Pacific Egg Cockle, Pacific Coast Egg Cockle, Pacific Eggcockle
Ref. Abbott, 1974 p 486 bw
Abbott & Dance, 1982 p 332 c
Amer. Fish. Soc., 1988 p 39
Syn. Cardium (Cardium) cruentatum A. A. Gould in Blake, 1855;
Cardium (Cardium) substriatum T. A. Conrad, 1837 [not A. Orbigny, 1850]
Ref. Bernard, 1983 p 38

sybariticum (W. H. Dall, 1886)
(3-5-4-0-4-2-4-16-4-15-0-0-0)
Dall's Egg Cockle, Delicate Eggcockle
Ref. Abbott, 1974 p 486 bw
Amer. Fish. Soc., 1988 p 39

vitellinum L. A. Reeve, 1844
(3-5-4-0-4-2-4-16-4-16-0-0-0)
[=Laevicardium (Laevicardium) laevigatum (C. v Linne, 1758)]
Ref. Abbott, 1974 p 485
Abbott & Dance, 1982 p 331