Genus Micromactra W. H. Dall, 1894

(3-4-4-0-21-3-2-55-0-0-0-0-0)
Ref. Vokes, 1980 p 136
[see also as Subgenus under Genus Mactra]
Ref. Abbott, 1974 p 488
Keen, 1971 p 204