Subgenus (Macoploma) H. A. Pilsbry & A. A. Olsson, 1941

(3-4-4-0-24-14-1-24-7-0-0-0-0)
Ref. Bernard, 1983 p 45
Keen, 1971 p 227
Vaught, 1989 p 132
[=(Psammacoma) W. H. Dall, 1900]
Ref. Abbott, 1974 p 507
[see also as Genus]

medioamericana A. A. Olsson, 1942
(3-4-4-0-24-14-1-24-7-1-0-0-0)
Ref. Bernard, 1983 p 45
Keen, 1971 p 227 d