Falcidens is one of three genera within the Falcidentidae; its radula consists of a single row of teeth which are mineralized in crystalline hydroxyapatite (a most unusual mineral in organisms), and its teeth are not periodically shed and replaced like in other molluscs. For details of the radula, see Radula#In_caudofoveates.
It contains the following species:
Falcidens acutargatus Salvini-Plawen, 1992
Falcidens aequabilis Salvini-Plawen, 1972
Falcidens caudatus Heath, 1918)
Falcidens chiastos Scheltema, 1989
Falcidens crossotus Salvini-Plawen, 1968
Falcidens gutturosus Kowalewsky, 1901)
Falcidens halanychi Schander, Scheltema & Ivanov, 2006
Falcidens hartmanae Schwabl, 1961)
Falcidens hoffmanni Stork, 1939)
Falcidens indicus Stork, 1941)
Falcidens ingolfensis Salvini-Plawen, 1971
Falcidens limifossorides Salvini-Plawen, 1986
Falcidens liosqueameus Salvini-Plawen, 1969
Falcidens lipuros Scheltema, 1989
Falcidens longus Scheltema, 1998
Falcidens loveni Nierstrasz, 1902)
Falcidens macracanthos Scheltema, 1998
Falcidens macrafrondis Scheltema, 1989
Falcidens nontargatus Salvini-Plawen, 1992
Falcidens normanni Nierstrasz, 1903)
Falcidens poias Scheltema, 1995
Falcidens profundus Salvini-Plawen, 1968
Falcidens sagittiferus Salvini-Plawen, 1968
Falcidens sterreri Salvini-Plawen, 1967)
Falcidens strigisquamatus Salvini-Plawen, 1977)
Falcidens targatus Salvini-Plawen, 1986
Falcidens targotegulatus Salvini-Plawen, 1992
Falcidens thorensis Salvini-Plawen, 1971
Falcidens vasconiensis Salvini-Plawen, 1996
Falcidens wireni Nierstrasz, 1902)
