Subgenus (Thyasira) J. B. P. A. de Lamarck, 1818

(3-4-4-0-20-6-2-30-3-0-0-0-0)
Ref. Bernard, 1983 p 29
Bernard, 1984 p 35

barbarensis (W. H. Dall, 1890)
(3-4-4-0-20-6-2-30-3-1-0-0-0)
Santa Barbara Cleftclam
Ref. Abbott, 1974 p 464 d
Amer. Fish. Soc., 1988 p 35
Keen, 1971 p 131 d
Syn. Cryptodon barbarensis W. H. Dall, 1890
Ref. Bernard, 1983 p 29

bisecta T. A. Conrad, 1849
(3-4-4-0-20-6-2-30-3-2-0-0-0)
Pacific Cleft Clam
Syn. Thyasira (Thyasira) disjuncta W. M. Gabb, 1866
Ref. Abbott, 1974 p 463 d

nipponica T. Habe & S. Nomura, 1925
(3-4-4-0-20-6-2-30-3-2-1-0-0)
[=Conchocele disjuncta W. M. Gabb, 1866]
Ref. Bernard, 1983 p 29

croulinensis (J. G. Jeffreys, 1874)
(3-4-4-0-20-6-2-30-3-3-0-0-0)
Ref. Abbott, 1974 p 463 d
Syn. Clausina croulinensis J. G. Jeffreys, 1847
Ref. Wagner, 1984 p 59 bw

cycladia S. Wood, 1853
(3-4-4-0-20-6-2-30-3-4-0-0-0)
Ref. Abbott, 1974 p 463

cygnus W. H. Dall, 1916
(3-4-4-0-20-6-2-30-3-5-0-0-0)
Swan Cleftclam
Ref. Abbott, 1974 p 464
Amer. Fish. Soc., 1988 p 35
Bernard, 1983 p 29

disjuncta W. M. Gabb, 1866
(3-4-4-0-20-6-2-30-3-6-0-0-0)
[=Thyasira (Thyasira) bisecta T. A. Conrad, 1849]
Ref. Abbott, 1974 p 463

ochotica Krishtofovich, 1936
(3-4-4-0-20-6-2-30-3-6-1-0-0)
[=Conchocele disjuncta W. M. Gabb, 1866]
Ref. Bernard, 1983 p 29

elliptica A. E. Verrill & K. J. Bush, 1898
(3-4-4-0-20-6-2-30-3-7-0-0-0)
Ref. Abbott, 1974 p 464 d

equalis (A. E. Verrill & K. J. Bush, 1898)
(3-4-4-0-20-6-2-30-3-8-0-0-0)
Equal Clleftclam
Ref. Abbott, 1974 p 463
Amer. Fish. Soc., 1988 p 35
Syn. Cryptodon croulinensis altus A. E. Verrill & K. J. Bush, 1898;
Cryptodon equalis A. E. Verrill & K. J. Bush, 1898
Ref. Bernard, 1984 p 35 bw
Syn. Cryptodon equalis A. E. Verrill & K. J. Bush, 1898
Ref. Wagner, 1984 p 59 bw

Var. alta A. E. Verrill & K. J. Bush, 1898
(3-4-4-0-20-6-2-30-3-8-0-0-1)
Ref. Abbott, 1974 p 463 d

eumyaria M. Sars, 1870
(3-4-4-0-20-6-2-30-3-9-0-0-0)
Mya Cleftclam
Ref. Abbott, 1974 p 464
Amer. Fish. Soc., 1988 p 35

excavata W. H. Dall, 1901
(3-4-4-0-20-6-2-30-3-10-0-0-0)
Ref. Abbott, 1974 p 464 d
Keen, 1971 p 131 d
[=Conchocele excavata (W. H. Dall, 1901)]
Ref. Bernard, 1983 p 29

ferruginosa (E. Forbes, 1844)
(3-4-4-0-20-6-2-30-3-11-0-0-0)
[=Thyasira (Axinulus) ferruginea R. Winckworth, 1932]
Ref. Abbott, 1974 p 463
Syn. Kellia ferruginosa E. Forbes, 1844
Ref. Wagner, 1984 p 59 bw

flexuosa authors [not Tellina flexuosa G. Montagu, 1803]
(3-4-4-0-20-6-2-30-3-12-0-0-0)
[=Thyasira (Thyasira) gouldii (R. A. Philippi, 1845)]
Ref. Bernard, 1984 p 35
Wagner, 1984 p 60

flexuosa (G. Montagu, 1803) [T]
(3-4-4-0-20-6-2-30-3-13-0-0-0)
Flexuose Cleft Clam, Flexuose Cleftclam
Ref. Amer. Fish. Soc., 1988 p 35
Syn. Thyasira (Thyasira) inaequalis (A. E. Verrill & K. J. Bush, 1898);
Thyasira (Thyasira) insignis (A. E. Verrill & K. J. Bush, 1898);
Thyasira (Thyasira) plana (A. E. Verrill & K. J. Bush, 1898)
Ref. Abbott, 1974 p 463 d
Syn. Tellina flexuosa G. Montagu, 1803;
Thyasira (Thyasira) inaequalis A. E. Verrill & K. J. Bush, 1898;
Thyasira (Thyasira) insignis A. E. Verrill & K. J. Bush, 1898;
Thyasira (Thyasira) plana A.E. Verrill & K. J. Bush, 1898
Ref. Wagner, 1984 p 60 bw

Form gouldii R. A. Philippi, 1845
(3-4-4-0-20-6-2-30-3-13-0-1-0)
Ref. Abbott, 1974 p 463

Form sarsii R. A. Philippi, 1845
(3-4-4-0-20-6-2-30-3-13-0-2-0)
Ref. Abbott, 1974 p 463

gouldii R. A. Philippi in T. Soot-Ryen, 1932
(3-4-4-0-20-6-2-30-3-13-1-0-0)
[=Thyasira (Thyasira) gouldii (R. A. Philippi, 1845)]
Ref. Bernard, 1984 p 35

fuegiensis (W. H. Dall, 1890)
(3-4-4-0-20-6-2-30-3-14-0-0-0)
Syn. Cryptodon fuegiensis W. H. Dall, 1890
Ref. Bernard, 1983 p 29

gouldii (R. A. Philippi, 1845)
(3-4-4-0-20-6-2-30-3-15-0-0-0)
Gould Cleftclam
Ref. Amer. Fish. Soc., 1988 p 36
Syn. Lucina gouldii R. A. Philippi, 1845;
Tellina flexuosa authors [not G. Montagu, 1803];
Thyasira (Thyasira) wajampolkana L. V. Krishtofovich, 1936
Ref. Bernard, 1983 p 29
Syn. Axinus gouldii R. A. Philippi in G. O. Sars, 1878;
Lucina gouldii R. A. Philippi, 1845;
Thyasira (Thyasira) flexuosa authors, not Tellina flexuosa G. Montagu, 1803;
Thyasira (Thyasira) flexuosa gouldii R. A. Philippi in T. Soot-Ryen, 1932;
Thyasira (Thyasira) tokunagai T. Kuroda & T. Habe, 1951;
Thyasira (Thyasira) wajampolkana L. V. Krishtofovich, 1936
Ref. Bernard, 1984 p 35 bw
Syn. Lucina gouldii R. A. Philippi, 1845;
Thyasira (Thyasira) flexuosa authors [not Tellina flexuosa G. Montagu, 1803];
Thyasira (Thyasira) tokunagai T. Kuroda & T. Habe, 1951;
Thyasira (Thyasira) wajampolkana L. V. Krishtofovich, 1936
Ref. Wagner, 1984 p 60 bw

grandis A. E. Verrill & E. A. Smith, 1885
(3-4-4-0-20-6-2-30-3-16-0-0-0)
Syn. Thyasira (Thyasira) pyriformis W. H. Dall, 1886
Ref. Abbott, 1974 p 463 d

granulosa T. A. Monterosato, 1874
(3-4-4-0-20-6-2-30-3-17-0-0-0)
Granulose Cleftclam
Ref. Abbott, 1974 p 463
Amer. Fish. Soc., 1988 p 36

inaequalis (A. E. Verrill & K. J. Bush, 1898)
(3-4-4-0-20-6-2-30-3-18-0-0-0)
[=Thyasira (Thyasira) flexuosa (G. Montagu, 1803)]
Ref. Abbott, 1974 p 463
Wagner, 1984 p 60

insignis (A. E. Verrill & K. J. Bush, 1898)
(3-4-4-0-20-6-2-30-3-19-0-0-0)
[=Thyasira (Thyasira) flexuosa (G. Montagu, 1803)]
Ref. Abbott, 1974 p 463
Wagner, 1984 p 60

magellanica W. H. Dall, 1901
(3-4-4-0-20-6-2-30-3-20-0-0-0)
Ref. Bernard, 1983 p 29

obesa A. E. Verrill
(3-4-4-0-20-6-2-30-3-21-0-0-0)
[=Thyasira (Thyasira) trisinuata A. Orbigny, 1842]
Ref. Abbott, 1974 p 463

ovoidea W. H. Dall, 1889
(3-4-4-0-20-6-2-30-3-22-0-0-0)
Ref. Abbott, 1974 p 463 d

plana (A. E. Verrill & K. J. Bush, 1898)
(3-4-4-0-20-6-2-30-3-23-0-0-0)
[=Thyasira (Thyasira) flexuosa (G. Montagu, 1803)]
Ref. Abbott, 1974 p 463
Wagner, 1984 p 60

plicata A. E. Verrill & E. A. Smith, 1885
(3-4-4-0-20-6-2-30-3-24-0-0-0)
Ref. Abbott, 1974 p 463

polygona J. G. Jeffreys, 1863
(3-4-4-0-20-6-2-30-3-25-0-0-0)
[=Thyasira (Thyasira) trisinuata A. Orbigny, 1842]
Ref. Abbott, 1974 p 463

pygmaea A. E. Verrill & K. J. Bush, 1898
(3-4-4-0-20-6-2-30-3-26-0-0-0)
Ref. Abbott, 1974 p 464 d

pyriformis W. H. Dall, 1886
(3-4-4-0-20-6-2-30-3-27-0-0-0)
[=Thyasira (Thyasira) grandis A. E. Verrill & E. A. Smith, 1885]
Ref. Abbott, 1974 p 463

rotunda J. G. Jeffreys, 1881
(3-4-4-0-20-6-2-30-3-28-0-0-0)
Rotund Cleftclam
Ref. Abbott, 1974 p 463
Amer. Fish. Soc., 1988 p 36

sarsi R. A. Philippi, 1845
(3-4-4-0-20-6-2-30-3-29-0-0-0)
Ref. Wagner, 1984 p 60

simplex A. E. Verrill & K. J. Bush, 1898
(3-4-4-0-20-6-2-30-3-30-0-0-0)
Simple Cleftclam
Ref. Abbott, 1974 p 464
Amer. Fish. Soc., 1988 p 36

subovata J. G. Jeffreys, ? 1881
(3-4-4-0-20-6-2-30-3-31-0-0-0)
Ref. Abbott, 1974 p 464

succisa J. G. Jeffreys, 1876
(3-4-4-0-20-6-2-30-3-32-0-0-0)
Cut-off Cleftclam
Ref. Abbott, 1974 p 464
Amer. Fish. Soc., 1988 p 36

tokunagai T. Kuroda & T. Habe, 1951
(3-4-4-0-20-6-2-30-3-33-0-0-0)
[=Thyasira (Thyasira) gouldii (R. A. Philippi, 1845)]
Ref. Bernard, 1984 p 35
Wagner, 1984 p 60

tomeana W. H. Dall, 1901
(3-4-4-0-20-6-2-30-3-34-0-0-0)
Ref. Bernard, 1983 p 29

tortuosa J. G. Jeffreys, 1881 (
3-4-4-0-20-6-2-30-3-35-0-0-0)
Ref. Abbott, 1974 p 463

tricarinata W. H. Dall, 1916
(3-4-4-0-20-6-2-30-3-36-0-0-0)
Ref. Abbott, 1974 p 464
[=Conchocele excavata (W. H. Dall, 1901)]
Ref. Bernard, 1983 p 29

trisinuata A. Orbigny, 1842
(3-4-4-0-20-6-2-30-3-37-0-0-0)
Atlantic Cleft Clam, Atlantic Cleftclam
Ref. Amer. Fish. Soc., 1988 p 36
Syn. Thyasira (Thyasira) obesa A. E. Verrill;
Thyasira (Thyasira) polygona J. G. Jeffreys, 1863
Ref. Abbott, 1974 p 463 d

wajampolkana L. V. Krishtofovich, 1936
(3-4-4-0-20-6-2-30-3-38-0-0-0)
[=Thyasira (Thyasira) gouldii (R. A. Philippi, 1845)]
Ref. Bernard, 1983 p 29
Bernard, 1984 p 35
Wagner, 1984 p 60