Subgenus (Stenoradsia) W. H. Dall, 1879
(7-0-5-3-0-5-4-6-20-0-0-0-0)
[see also under Genus Stenoplax]acrior P. P. Carpenter in H. A. Pilsbry, 1892
(7-0-5-3-0-5-4-6-20-1-0-0-0)
[=Stenoplax (Stenoradsia) magdalenensis (R. B. Hinds, 1844)]
Ref. Kaas & Van Belle, 1980 p 2