Subgenus (Bucardium) J. E. Gray, 1853

(3-4-4-0-4-2-1-22-2-0-0-0-0)
Syn. Ringicardium P. Fischer, 1887
Ref. Lindner, 1977 p 110
Vaught, 1989 p 129
[see also as Genus]

ringens J. G. Bruguiere, 1798
(3-4-4-0-4-2-1-22-2-1-0-0-0)
Ref. Lindner, 1977 pl 60 c