Subgenus (Fissidentalium) P. Fischer, 1885

(8-0-1-0-1-3-2-11-9-0-0-0-0)
Ref. Abbott, 1974 p 386
Keen, 1971 p 884
[see also as Genus]

Shell: The shell is large and circular in cross-section.
There are numerous longitudinal ribs.
A long slit is present on the convex side of the posterior (anal) (apical) opening.

complexum M. Yokoyama, 1920

(8-0-1-0-1-3-2-11-9-1-0-0-0)
[=Fissidentalium (Fissidentalium) yokoyamai (J. Makiyama, 1931)]
Ref. Habe, 1964 p 12

ergasticum P. Fischer, 1885 [T]

(8-0-1-0-1-3-2-11-9-2-0-0-0)
Ref. Abbott, 1974 p 386
[see also under Fissidentalium (Fissidentalium)]

floridense J. Henderson, 1920

(8-0-1-0-1-3-2-11-9-3-0-0-0)
Florida Tusk
Syn. Dentalium (Dentalium) capillosum J. G. Jeffreys
Ref. Abbott, 1974 p 386

megathyris W. H. Dall, 1890

(8-0-1-0-1-3-2-11-9-4-0-0-0)
Size 4.9" long
Ref. Abbott, 1974 p 884 d
Keen, 1971 p 884

meridionale H. A. Pilsbry & B. Sharp, 1897

(8-0-1-0-1-3-2-11-9-5-0-0-0)
Meridian Tusk
Ref. Abbott, 1974 p 386 bw

profundorum E. A. Smith, 1894

(8-0-1-0-1-3-2-11-9-6-0-0-0)
[=Fissidentalium (Fissidentalium) profundorum (E. A. Smith, 1894)]
Ref. Habe, 1964 p 13

vallicolens W. J. Raymond, 1904

(8-0-1-0-1-3-2-11-9-7-0-0-0)
Raymond's Tusk
[?=Dentalium (Dentalium) vallicolens W. J. Raymond, 1904
Ref. Keen, 1971 p 884
[=Dentalium (Graptacme) vallicolens W. J. Raymond, 1904]
Ref. Abbott, 1974 p 386

verrilli J. Henderson, 1920

(8-0-1-0-1-3-2-11-9-8-0-0-0)
Ref. Abbott, 1974 p 383