Subgenus (Marmarostoma) W. Swainson, 1829

(5-4-1-3-2-12-5-13-13-0-0-0-0)
Ref. Lindner, 1977 p 39
Syn. (Senectus) W. Swainson, 1840
Ref. Abbott, 1974 p 57
Keen, 1971 p 353
Vaught, 1989 p 11