Subgenus (Axinulus) A. E. Verrill & K. J. Bush, 1898

(3-4-4-0-20-6-2-30-1-0-0-0-0)
Syn. (Tellimya) T. Brown
Ref. Abbott, 1974 p 463

brevis A. E. Verrill & K. J. Bush, 1898
(3-4-4-0-20-6-2-30-1-1-0-0-0)
Short Cleftclam
Ref. Abbott, 1974 p 463
Amer. Fish. Soc., 1988 p 35

ferruginea R. Winckworth, 1932
(3-4-4-0-20-6-2-30-1-2-0-0-0)
Reddish Cleftclam
Ref. Amer. Fish. Soc., 1988 p 35
Syn. Thyasira (Thyasira) ferruginosa E. Forbes, 1844
Ref. Abbott, 1974 p 463 d