Subgenus (Sectiarca) A. A. Olsson, 1961

(3-7-3-0-1-1-1-2-17-0-0-0-0)
Ref. Abbott, 1974 p 423
[=(Scapharca) J. E. Gray, 1847]
Ref. Vaught, 1989 p 115
[see also as Genus]

concinna (G. B. Sowerby, 1833)
(3-7-3-0-1-1-1-2-17-1-0-0-0)
Ref. Abbott, 1974 p 423

floridana (T. A. Conrad, 1869) [T]
(3-7-3-0-1-1-1-2-17-2-0-0-0)
Cut-ribbed Ark
Ref. Abbott, 1974 p 423 bw
Abbott & Dance, 1982 p 292 c
Amer. Fish. Soc., 1988 p 24

lienosa (T. Say) [f]
(3-7-3-0-1-1-1-2-17-3-0-0-0)
Syn. Anadara (Anadara) secticostata L. A. Reeve, 1844
Ref. Abbott, 1974 p 423