Subgenus (Micromactra) W. H. Dall, 1894

(3-4-4-0-21-3-2-41-14-0-0-0-0)
Ref. Abbott, 1974 p 488
Bernard, 1983 p 39
Keen, 1971 p 204
Vaught, 1989 p 130

angusta L. A. Reeve, 1854
(3-4-4-0-21-3-2-41-14-1-0-0-0)
Syn. Mactra (Mactra) angusta L. A. Reeve, 1854;
Mactra (Micromactra) atacama H. A. Pilsbry & A. A. Olsson, 1941
Ref. Bernard, 1983 p 39
Syn. Mactra (Mactra) atacama H. A. Pilsbry & A. A. Olsson, 1941
Ref. Keen, 1971 p 204 bw

atacama H. A. Pilsbry & A. A. Olsson, 1941
(3-4-4-0-21-3-2-41-14-2-0-0-0)
[=Mactra (Micromactra) angusta L. A. Reeve, 1854]
Ref. Bernard, 1983 p 39

californica T. A. Conrad, 1837 [T]
(3-4-4-0-21-3-2-41-14-3-0-0-0)
California Surfclam, Californian Mactra
Ref. Abbott, 1974 p 488 d
Amer. Fish. Soc., 1988 p 40
Keen, 1971 p 204 d
Syn. Mactra (Mactra) californica T. A. Conrad, 1837 [not L. A. Reeve, 1854];
Mactra (Mactra) falcata authors [not A. A. Gould, 1850];
Mactra (Mactra) fragilis authors [not J. E. Gray, 1854];
Mactra (Mactra) ovalina L. A. Reeve, 1854
Ref. Bernard, 1983 p 39

fonsecana L. G. Hertlein & A. M. Strong, 1950
(3-4-4-0-21-3-2-41-14-4-0-0-0)
Syn. Mactra (Mactra) angusta authors, not L. A. Reeve, 1854
Ref. Bernard, 1983 p 39
Syn. "Mactra (Mactra) angusta Deshayes" of H. A. Pilsbry & H. N. Lowe, 1932
Ref. Keen, 1971 p 204 bw

isthmica H. A. Pilsbry & H. N. Lowe, 1932
(3-4-4-0-21-3-2-41-14-5-0-0-0)
Ref. Bernard, 1983 p 39
Keen, 1971 p 204 bw

nasuta A. A. Gould, 1851
(3-4-4-0-21-3-2-41-14-6-0-0-0)
Gould's Pacific Mactra
Syn. Mactra (Mactra) californica L. A. Reeve, 1854;
Mactra (Mactra) deshayesi T. A. Conrad, 1868;
Mactra (Mactra) hiantina G. P. Deshayes, 1855;
Mactra (Mactra) revellei J. W. Durham, 1950
Ref. Abbott, 1974 p 488

vanattae H. A. Pilsbry & H. N. Lowe, 1932
(3-4-4-0-21-3-2-41-14-7-0-0-0)
Syn. Mactra (Micromactra) vanattae acymata H. A. Pilsbry & H. N. Lowe, 1932
Ref. Bernard, 1983 p 39
Keen, 1971 p 204 bw

acymata H. A. Pilsbry & H. N. Lowe, 1932
(3-4-4-0-21-3-2-41-14-7-1-0-0)
[=Mactra (Micromactra) vanattae H. A. Pilsbry & H. N. Lowe, 1932]
Ref. Bernard, 1983 p 39
Keen, 1971 p 204