Kermarion kermadecensis (E.A. Smith, 1873) New Zealand, Kermadec Islands
Helicarion kiiensis M. Azuma, 1960 Japan
Helicarion kimioi M. Azuma, 1960 Japan
Geotrochus kinabaluensis (E.A. Smith, 1895) Malaysia, Borneo
Geotrochus kitteli J.J. Vermeulen, T.S. Liew& M. Schilthuizen, 2015
Rahula kleini E. Gittenberger, Leda& Sherub, 2017
Lepidotrichia kobelti (O.F. von Möllendorff,1890)
Bekkochlamys koshikijimana (H.A. Pilsbry& Y. Hirase, 1904) Japan, Kagoshima
Ovachlamys kotosyonis (J.T. Kuroda & T. Kano,1941) Japan
Helicarion koyamai J.T. Kuroda, 1953 Japan
Helicarion koyanoi T. Habe, 1953 Japan
Helicarion kreffti J.C. Cox, 1864 Queensland
Helicarion kurodai T. Habe, 1957 Japan
Helicarion kuroshimana Y. Hirase, 1908 Japan
Petalochlamys labilis (A.A. Gould, 1859) Japan, Mitsumori
Dendrotrochus labillardierei (E.A. Smith, 1884) Papua New Guinea, Admiralty Islands
Geotrochus labuanensis L. Pfeiffer, 1863 Malaysia, Borneo
Helicarion lampra (H.A. Pilsbry& Y. Hirase, 1904) Japan, Hyogo
Saphtia lamtoensis A.J. de Winter, 2008
Sivella latior (A.R.J.B. Bavay& P. Dautzenberg, 1908) Vietnam, Nat Son
Dendrotrochus layardi (W.D. Hartman, 1889) Vanuatu Island, New Hebrides14,2 mm
Helicarion leopardina T. Iredale, 1941 New South Wales
Helicarion leucospira L. Pfeiffer, 1857 Australia, Lismore
Dupontia levensonia J. Gerlach, 2003 Seychelles
Dupontia levis H.H. Godwin-Austen, 1908 Mauritius
Nipponochlamys lineatus (H.A. Pilsbry& Y. Hirase, 1904) Japan
Harmogenanina linophora (P.M.A. Morelet, 1860) Mauritius
Trochochlamys lioconus (H.A. Pilsbry& Y. Hirase, 1905) Japan, Yamagata
Helicarion lioderma H.A. Pilsbry, 1901 Japan
Westracystis lissus (E.A. Smith, 1894) Australia, Weaber Ranges6,7 mm
Helicarion longa H.A. Pilsbry & Y. Hirase,1905 Japan
Helicarion longissima H.A. Pilsbry & Y. Hirase,1909 Japan
Hemitrichiella luteofasciata (H.C. Lea, 1840) Philippines, Luzon Island27,4 mm
Hemitrichiella luteofasciata libmanana (P. Bartsch, 1942) Philippines, Catanduanes30 mm
Helicarion maculosa Hyman, Lamborena& Köhler, 2017