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, 1992Falcidens aequabilis Salvini-Plawen, 1972Falcidens caudatus Heath, 1918)Falcidens chiastos Scheltema, 1989Falcidens crossotus Salvini-Plawen, 1968Falcidens gutturosus Kowalewsky, 1901)Falcidens halanychi Schander, Scheltema & Ivanov, 2006Falcidens hartmanae Schwabl, 1961)Falcidens hoffmanni Stork, 1939)Falcidens indicus Stork, 1941)Falcidens ingolfensis Salvini-Plawen, 1971Falcidens limifossorides Salvini-Plawen, 1986Falcidens liosqueameus Salvini-Plawen, 1969Falcidens lipuros Scheltema, 1989Falcidens longus Scheltema, 1998Falcidens loveni Nierstrasz, 1902)Falcidens macracanthos Scheltema, 1998Falcidens macrafrondis Scheltema, 1989Falcidens nontargatus Salvini-Plawen, 1992Falcidens normanni Nierstrasz, 1903)Falcidens poias Scheltema, 1995Falcidens profundus Salvini-Plawen, 1968Falcidens sagittiferus Salvini-Plawen, 1968Falcidens sterreri Salvini-Plawen, 1967)Falcidens strigisquamatus Salvini-Plawen, 1977)Falcidens targatus Salvini-Plawen, 1986Falcidens targotegulatus Salvini-Plawen, 1992Falcidens thorensis Salvini-Plawen, 1971Falcidens vasconiensis Salvini-Plawen, 1996Falcidens wireni Nierstrasz, 1902)
