Subgenus (Calloarca) J. E. Gray, 1857

(3-7-3-0-1-1-2-14-3-0-0-0-0)
Ref. Bernard, 1983 p 15
Keen, 1971 p 40
Vaught, 1989 p 115
[see also as Genus]

alternata (G. B. Sowerby, 1833)
(3-7-3-0-1-1-2-14-3-1-0-0-0)
Ref. Keen, 1971 p 40 bw
Syn. Byssoarca alternata G. B. Sowerby, 1833
Ref. Bernard, 1983 p 15