Subgenus (Nucinella) S. V. Wood, 1851

(3-7-3-0-4-3-0-8-3-0-0-0-0)

adamsi (W. H. Dall, 1898)
(3-7-3-0-4-3-0-8-3-1-0-0-0)
Ref. Abbott, 1974 p 427

ovalis S. V. Wood, 1851 [T]
(3-7-3-0-4-3-0-8-3-2-0-0-0)
Ref. Abbott, 1974 p 427

serrei E. Lamy, 1912
(3-7-3-0-4-3-0-8-3-3-0-0-0)
Ref. Abbott, 1974 p 427 d

subdola (A. M. Strong & L. G. Hertlein, 1937)
(3-7-3-0-4-3-0-8-3-4-0-0-0)
Ref. Abbott, 1974 p 427