Comitas kenneti (FOSSIL) A.G. Beu, 1970 †
Inquisitor kilburni F.E. Wells, 1994
Comitas kirai A.W.B. Powell, 1969
Miraclathurella kleinrosa G.W. Nowell-Usticke, 1969
Crassispira kluthi H.K. Jordan, 1936
Inquisitor komiticus (FOSSIL) C.R. Laws, 1939 †
Knefastia kugleri (FOSSIL) P.O. Jung, 1965 †
Antiplanes kurilensis Y.I. Kantor & A.V. Sysoev,1991
Abyssocomitas kurilokamchatica A.V. Sysoev & Y.I. Kantor,1986
Inquisitor kurodai (T. Habe & S. Kosuge,1966)
Comitas kuroharai (K. Oyama, 1962)
Thelecytharella kwandangensis (M.M. Schepman, 1913)
Carinodrillia lachrymosa J.H. McLean & L.H. Poorman,1971
Crassispira laevisulcata H.F. Von Maltzan, 1883
Crassispira lagouardensis P. Lozouet, 2015
Leucosyrinx lancea Y.C. Lee, 2001
Ptychobela lanceolata (L.A. Reeve, 1845)
Inquisitor lanceolatus (FOSSIL) (L.H. Hupé, 1854 †)
Inquisitor lassulus C. Hedley, 1922
Inquisitor laterculata (G.B. II Sowerby, 1870)
Funa laterculoides (K.H. Barnard, 1958)
Comitas latescens (FOSSIL) (F.W. Hutton, 1873 †)
Comitas latiaxialis (FOSSIL) (P. Marshall, 1918 †)
Inquisitor latifasciata (G.B. II Sowerby, 1870)
Crassispira latiriformis (J.C. Melvill, 1923)
Inquisitor latiriformis R.N. Kilburn, 1988
Funa latisinuata (E.A. Smith, 1877)
Crassispira latizonata (E.A. Smith, 1882)
Comitas laura (K.H.J. Thiele, 1925)
Crassispira lavanonoensis L. Bozzetti, 2008
Crassispira lavillei (FOSSIL) M.E.A. de Boury, 1899 †
Ptychobela lavinia (W.H. Dall, 1919)
Crassiclava layardi (G.B. III Sowerby, 1897)
Crassispira lepta (FOSSIL) (F.E. Edwards, 1861 †)
Crassispira lepta leptoides (FOSSIL) M.E.A. de Boury, 1899 †