Subgenus (Ectenagena) W. P. Woodring, 1938

(3-5-4-0-18-7-0-5-4-0-0-0-0)
Ref. Abbott, 1974 p 519 d
Bernard, 1983 p 50
Vaught, 1989 p 134
[see also as Genus]

elongata W. H. Dall, 1916 [T]
(3-5-4-0-18-7-0-5-4-1-0-0-0)
Ref. Abbott, 1974 p 519
Syn. Calyptogena (Calyptogena) elongata W. H. Dall, 1916 [not Akebiconcha kawamurai elongata Ozaki, 1958]
Ref. Bernard, 1983 p 50

magnifica K. J. Boss & R. D. Turner, 1980
(3-5-4-0-18-7-0-5-4-2-0-0-0)
Magnificent Calypto Clam
Ref. Abbott & Dance, 1982 p 351 c
Bernard, 1983 p 50

modioliforma (K. J. Boss, 1968)
(3-5-4-0-18-7-0-5-4-3-0-0-0)
Ref. Abbott, 1974 p 519