Subgenus (Anchomasa) W. E. Leach in J. E. Gray, 1852

(3-4-3-2-1-1-3-4-1-0-0-0-0)
Ref. Abbott, 1974 p 543
Bernard, 1983 p 60
Syn. (Anchomosa) E. Lamy, 1925
Ref. Vaught, 1989 p 138
[see also as Genus]

lamellosa (A. Orbigny, 1846)
(3-4-3-2-1-1-3-4-1-1-0-0-0)
Ref. Abbott, 1974 p 543
Syn. Pholas (Pholas) lamellosa A. Orbigny, 1846;
Pholas (Pholas) subtruncata authors [not G. B. Sowerby, 1834]
Ref. Bernard, 1983 p 60

parva T. Pennant, 1777 [T]
(3-4-3-2-1-1-3-4-1-2-0-0-0)
Ref. Abbott, 1974 p 543

Similis
(3-4-3-2-1-1-3-4-1-3-0-0-0)
Rock Borer
Ref. Penniket, 1970 p 104 c

subtruncata (G. B. Sowerby, 1834)
(3-4-3-2-1-1-3-4-1-4-0-0-0)
Pacific Mud Piddock, Pacific Mud-piddock
Ref. Amer. Fish. Soc., 1988 p 46
Syn. Barnea (Barnea) pacifica R. E. C. Stearns, 1871;
Barnea (Barnea) spathulata G. P. Deshayes, 1843
Ref. Abbott, 1974 p 543
Keen, 1971 p 275 bw
Syn. Pholas (Pholas) pacifica R. E. C. Stearns, 1871;
Pholas (Pholas) spathulata G. P. Deshayes, 1843 [not G. B. Sowerby, 1871];
Pholas (Pholas) subtruncata G. B. Sowerby, 1834;
Zirfaea pilsbryi authors [not H. N. Lowe, 1931]
Ref. Bernard, 1983 p 60

truncata (T. Say, 1822)
(3-4-3-2-1-1-3-4-1-5-0-0-0)
Atlantic Mud-piddock, Fallen Angel Wing
Ref. Abbott, 1974 p 543 bw
Abbott & Dance, 1982 p 371 c
Amer. Fish. Soc., 1988 p 46