Subgenus (Suchium) J. Makiyama, 1925 [1924]

(5-4-1-3-2-11-13-17-5-0-0-0-0)
Ref. Lindner, 1977 p 37
Vaught, 1989 p 10

giganteum (R. P. Lesson, 1831)
(5-4-1-3-2-11-13-17-5-1-0-0-0)
Button Shell, Giant Button Shell
Ref. Abbott & Dance, 1982 p 44 c
Kaicher, 1990 #5731 bw
Lindner, 1977 pl 5 c

moniliferum (J. B. P. A. de Lamarck, 1822)
(5-4-1-3-2-11-13-17-5-2-0-0-0)
Ref. Kaicher, 1990 #5729 bw
Lindner, 1977 pl 5 c