Subgenus (Goniocuna) Klappenbach, 1962
(3-4-4-0-5-2-2-2-2-0-0-0-0) Ref. Abbott, 1974 p 479 dalli E. G. Vanatta, 1904 [T] (3-4-4-0-5-2-2-2-2-1-0-0-0) Dall Condylclam, Dall's Cuna Clam Ref. Abbott, 1974 p 479 bw Amer. Fish. Soc., 1988 p 38
(3-4-4-0-5-2-2-2-2-0-0-0-0) Ref. Abbott, 1974 p 479
dalli E. G. Vanatta, 1904 [T] (3-4-4-0-5-2-2-2-2-1-0-0-0) Dall Condylclam, Dall's Cuna Clam Ref. Abbott, 1974 p 479 bw Amer. Fish. Soc., 1988 p 38