- Kapal, Genus Kapal Martin, 1930 † (OCTOPODA (unassigned)) (FOSSIL)
- Kapala, syn of: Genus Buccipagoda W.F. Ponder, 2010 (BUCCINIDAE)
- kapala, Falsimargarita kapala B.A. Marshall, 2016 - (CALLIOSTOMATIDAE)
- kapalae, Xyleptogyra kapalae B.A. Marshall, 1988 - (MELANODRYMIIDAE)
- kapalae, Pectinodonta kapalae B.A. Marshall, 1985 - (PECTINODONTIDAE)
- kapalae, Cyclopecten kapalae H.H. Dijkstra, 1990 - (PROPEAMUSSIIDAE)
- kapalae, Turbo kapalae B.A. Marshall, 1988 - (TURBINIDAE)
- Kaparachlamys, Genus Kaparachlamys Boreham, 1965 † (PECTINIDAE) (FOSSIL)
- kapaurensis, Macrocycloides kapaurensis (E.A. Smith, 1897) - (RHYTIDIDAE)
- kapayanensis, Phaedusa filicostata kapayanensis (J.J.M. de Morgan, 1885) - (CLAUSILIIDAE)
- kapayanensis, Alycaeus kapayanensis J.J.M. de Morgan, 1885 - (CYCLOPHORIDAE)
- kapelana, Bythinella kapelana P. Radoman, 1976 - (BYTHINELLIDAE)
- kapellae, Helix kapellae W. Kobelt, 1906 - syn of: Helix pomatia C. Linnaeus, 1758 - (HELICIDAE)
- kapila, Kashmirites kapila (Diener, 1897 †) - (PRIONITIDAE) (FOSSIL)
- kapiolaniae, Alcyna kapiolaniae H.A. Pilsbry, 1917 - syn of: Alcyna ocellata (A. Adams, 1860) - (TROCHIDAE)
- kapitea, Notocallista kapitea A.G. Beu, 1970 † - (VENERIDAE) (FOSSIL)
- kapitiensis, Callochiton kapitiensis M.K. Mestayer, 1926 - (CALLOCHITONIDAE)
- kapitiensis, Mesopeplum kapitiensis M.K. Mestayer, 1929 - syn of: Mesopeplum convexum (J.R.C. Quoy, 1835) - (PECTINIDAE)
- kapitzkei, Pavloviteuthis kapitzkei T. Engeser, 1995 † - (DIPLOBELIDAE) (FOSSIL)
- kaplani, Pseudolimea kaplani Kurushin, 1987 † - (LIMIDAE) (FOSSIL)
- kapnodes, Mesomphix kapnodes (W.G. Binney, 1857) - (ZONITIDAE)
- kaporensis, Robertsiella kaporensis D.H.S. Davis, 1980 - (POMATIOPSIDAE)
- kappa, Taia lanaonis kappa (P. Bartsch, 1907) - (VIVIPARIDAE)
- kappleri, Doryssa kappleri (J.H. Vernhout, 1914) - (PACHYCHILIDAE)
- Kapua, Subgenus Turriscala (Kapua) Marwick, 1931 † (EPITONIIDAE) (FOSSIL)
- kapua, Jupiteria kapua J. Marwick, 1931 † - (NUCULANIDAE) (FOSSIL)
- kapuaensis, Pleuromeris kapuaensis J. Marwick, 1931 † - (CARDITIDAE) (FOSSIL)
- kapuaensis, Polyschides kapuaensis P.A. Maxwell, 1992 † - (GADILIDAE) (FOSSIL)
- kapuana, Partulina horneri kapuana J.J. Gouveia & J.J. Gouveia, 1920 - (ACHATINELLIDAE)
- Kapuatriton, Genus Kapuatriton A.G. Beu & P.A. Maxwell, 1987 (CANCELLARIIDAE)
- kapuensis, Achatinella mustelina kapuensis D.A. Welch, 1938 - (ACHATINELLIDAE)
- kapuranga, Splendrillia kapuranga R.K. Dell, 1953 - (DRILLIIDAE)
- kaputarensis, Cralopa kaputarensis J. Stanisic, 1990 - (CHAROPIDAE)
- kaputarensis, Vitellidelos kaputarensis M. Shea & R.J. Griffiths, 2010 - (RHYTIDIDAE)
- Kara, Subgenus Thaumastus (Kara) H. Strebel, 1910 (MEGASPIRIDAE)
- Karabaghia, Genus Karabaghia W.A. Lindholm, 1927 (HYGROMIIDAE)
- karachiensis, Ischnochiton karachiensis P. Kaas, 1954 - syn of: Ischnochiton bouryi C. Dupuis, 1917 - (ISCHNOCHITONIDAE)
- karachiensis, Brachyodontes karachiensis J.C. Melvill & R. Standen, 1907 - syn of: Brachidontes pharaonis (P. Fischer, 1870) - (MYTILIDAE)
- karachiensis, Cellana karachiensis (R. Winckworth, 1930) - (NACELLIDAE)
- karachiensis, Patella karachiensis R. Winckworth, 1930 - syn of: Cellana radiata (I. von Born, 1778) - (PATELLIDAE)
- karachiensis, Pupoides karachiensis A.J. Peile, 1929 - (PUPILLIDAE)
- karachiensis, Syrnola karachiensis J.C. Melvill, 1897 - (PYRAMIDELLIDAE)
- Karaclymenia, Genus Karaclymenia Bogoslovsky , 1983 † (CARINOCLYMENIIDAE) (FOSSIL)
- Karadzharia, Genus Karadzharia Korn, 2002 † (RECTOCLYMENIIDAE) (FOSSIL)
- Karadzharoceras, Genus Karadzharoceras Zhuravleva, 1972 † (DISCOSORIDA (unassigned)) (FOSSIL)
- Karaftohelix, Subgenus Bradybaena (Karaftohelix) H.A. Pilsbry, 1927 (BRADYBAENIDAE)
- karaftonis, Stenothyra karaftonis J.T. Kuroda, 1962 - (STENOTHYRIDAE)
- karagacensis, Melanopsis vindobonensis karagacensis P.S. Pavlovic, 1927 † - (MELANOPSIDAE) (FOSSIL)
- karagandense, Mimimitoceras karagandense (Bogoslovsky, 1971 †) - (PRIONOCERATIDAE) (FOSSIL)
- Karagandoceras, Genus Karagandoceras Librovitch, 1938 † (KARAGANDOCERATIDAE) (FOSSIL)
- KARAGANDOCERATIDAE Librovitch, 1957 † - Family (CEPHALOPODA-AMMONOIDEA-GONIATITIDA) (FOSSIL)
- karaganicus, Viviparus karaganicus Volkova, 1955 † - (VIVIPARIDAE) (FOSSIL)
- karaginskiensis, Chlamys karaginskiensis V.N. Sinelnikova, 1975 † - (PECTINIDAE) (FOSSIL)
- karagweensis, Limicolaria martensi karagweensis W. Kobelt, 1913 - (ACHATINIDAE)
- karagwensis, Limicolaria karagwensis W. Kobelt - (ACHATINIDAE)
- karagwensis insularis, Limicolaria karagwensis insularis M. Connolly, 1932 - (ACHATINIDAE)
- karainensis, Lindbergia karainensis W. Rähle & F. Riedel, 1987 - (PRISTILOMATIDAE)
- karajarensis, Rectoclymenia karajarensis Nikolaeva & Ivanovich, 2005 † - (RECTOCLYMENIIDAE) (FOSSIL)
- karaka, Jupiteria karaka J. Marwick, 1931 † - (NUCULANIDAE) (FOSSIL)
- karakaensis, Awateria karakaensis J. Marwick, 1931 † - (BORSONIIDAE) (FOSSIL)
- karakaschi, Pseudothurmannia karakaschi Manolov, 1962 † - (CRIOCERATITIDAE) (FOSSIL)
- karakaschi, Crioceras karakaschi Sarkar, 1955 † - syn of: Crioceratites shibaniae (Sarkar, 1955 †) - (CRIOCERATITIDAE) (FOSSIL)
- karakaschi, Cymatoceras karakaschi Shimansky, 1975 † - (CYMATOCERATIDAE) (FOSSIL)
- karakaschi, Neohoploceras karakaschi (Uhlig, 1902 †) - (NEOCOMITIDAE) (FOSSIL)
- Karakaschiceras, Genus Karakaschiceras Thieuloy , 1971 † (NEOCOMITIDAE) (FOSSIL)
- karakorum, Vespericola karakorum R.R. Talmadge, 1962 - (POLYGYRIDAE)
- karakovensis, Theodoxus karakovensis Taner, 1974 † - syn of: Theodoxus bukowskii (P. Oppenheim, 1919 †) - (NERITIDAE) (FOSSIL)
- karakovensis strictus, Theodoxus karakovensis strictus Taner, 1974 † - syn of: Theodoxus bukowskii (P. Oppenheim, 1919 †) - (NERITIDAE) (FOSSIL)
- karakubensis, Omphalotrochus karakubensis Zernetskaya, 1967 † - (OMPHALOTROCHIDAE) (FOSSIL)
- Karamaiceras, Genus Karamaiceras Sokolov, 1967 † (AMMONOIDEA (unassigned)) (FOSSIL)
- Karamaites, Genus Karamaites Sokolov, 1961 † (AMMONOIDEA (unassigned)) (FOSSIL)
- karamanensis, Conus pelagicus karamanensis ErünalErentöz, 1958 † - (CONIDAE) (FOSSIL)
- karamanensis, Fusus karamanensis E. Forbes, 1844 - syn of: Enginella leucozona (R.A. Philippi, 1844) - (FASCIOLARIIDAE)
- karamanensis, Cancilla scrobiculata karamanensis ErünalErentöz, 1958 - (MITRIDAE)
- karamanensis, Tornus karamanensis B.M. Landau & al., 2013 † - (TORNIDAE) (FOSSIL)
- karamanensis, Conomitra karamanensis B.M. Landau & al., 2013 † - (VOLUTOMITRIDAE) (FOSSIL)
- karamani, Iglica karamani (L. Kušcer, 1935) - (HYDROBIIDAE)
- karamani, Lyhnidia karamani S. Hadžišce, 1959 - (HYDROBIIDAE)
- karamea, Canallodiscus karamea B.A. Marshall & G.M. Barker, 2008 - (CHAROPIDAE)
- karangatiense, Stenopopanoceras karangatiense A.M. Popov, 1968 † - (PARAPOPANOCERATIDAE) (FOSSIL)
- Karangatites, Genus Karangatites Popov , 1968 † (MEEKOCERATIDAE) (FOSSIL)
- karangense, Proclava karangense (Martin, 1906 †) - (CERITHIIDAE) (FOSSIL)
- karangensis, Longchaeus karangensis (Martin, 1905 †) - (PYRAMIDELLIDAE) (FOSSIL)
- karanglense, Pseudocycloceras karanglense I.S. Barskov, 1959 † - (SPYROCERATIDAE) (FOSSIL)
- karapadensis, Karapadites karapadensis (Kossmat, 1897 †) - (KOSSMATICERATIDAE) (FOSSIL)
- Karapadites, Subgenus Kossmaticeras (Karapadites) Collignon, 1954 † (KOSSMATICERATIDAE) (FOSSIL)
- karasawai, Limacina karasawai Y. Ando, 2011 † - (LIMACINIDAE) (FOSSIL)
- Karaschiceras, Genus Karaschiceras † (AMMONOIDEA (unassigned)) (FOSSIL)
- karasensis, Egilina karasensis E. Robba, 2013 † - (PYRAMIDELLIDAE) (FOSSIL)
- karasensis, Turbonilla karasensis E. Robba, 2013 † - (PYRAMIDELLIDAE) (FOSSIL)
- karasensis, Puposyrnola karasensis E. Robba, 2013 † - (PYRAMIDELLIDAE) (FOSSIL)
- karasensis, Nisiturris karasensis E. Robba, 2013 † - (PYRAMIDELLIDAE) (FOSSIL)
- karasensis, Bartschella karasensis E. Robba, 2013 † - (PYRAMIDELLIDAE) (FOSSIL)
- karasuna, Theodoxus karasuna A. Mousson - (NERITIDAE)
- karataucicus, Procolumbites karataucicus Astachova, 1968 † - (COLUMBITIDAE) (FOSSIL)
- karatauense, Corysoceras karatauense P.A. Zhuravleva, 1974 † - syn of: Almaloceras abaeratum P.A. Zhuravleva, 1974 † - (ONCOCERIDA (unassigned)) (FOSSIL)
- karatshatyrensis, Laschmaspira karatshatyrensis (Licharev, 1967 †) - (ORTHONEMIDAE) (FOSSIL)
- karavankensis, Sloeudaronia karavankensis A. Kaim & al., 2006 † - (SKENEIDAE) (FOSSIL)
- karczewski, Setobaudinia karczewski F. Köhler, 2011 - (CAMAENIDAE)
- karczewskii, Donaldiella karczewskii Krawczynski, 2002 † - (LOPHOSPIRIDAE) (FOSSIL)
- Kardailites, Genus Kardailites Ruzhentsev & Bogoslovskaya, 1971 † (STENOGLAPHYRITIDAE) (FOSSIL)
- Karelainia, Genus Karelainia G.M. Davis, 1979 (POMATIOPSIDAE)
- kareli, Kerkia kareli Beran, M. Bodon & S. Cianfanelli, 2014 - (HYDROBIIDAE)
- karenae, Ferreiraella xylophaga karenae (B.I. Sirenko, 2001) - (ABYSSOCHITONIDAE)
- karenae, Phyllodesmium karenae R.C. Moore & T.M. Gosliner, 2009 - (FACELINIDAE)
- karenaica, Surcula karenaica Noetling, 1901 † - (CLAVATULIDAE) (FOSSIL)
- karenkoensis, Diplommatina taiwanica karenkoensis J.T. Kuroda, 1941 - (DIPLOMMATINIDAE)
- karenorum, Plectopylis karenorum (W.T. Blanford, 1865) - (PLECTOPYLIDAE)
- karetai, Pleurotomaria karetai Begg & J. Grant-Mackie, 2003 † - (PLEUROTOMARIIDAE) (FOSSIL)
- karevi, Ohrigocea karevi S. Hadžišce, 1959 - (HYDROBIIDAE)
- Karevia, syn of: Genus Ohrigocea S. Hadžišce, 1956 (HYDROBIIDAE)
- kargalensis, Eothinites kargalensis Ruzhentsev, 1933 † - (METALEGOCERATIDAE) (FOSSIL)
- Kargalites, Genus Kargalites Ruzhencev , 1938 † (MARATHONITIDAE) (FOSSIL)
- karica, Onoba karica A.N. Golikov, 1986 - syn of: Onoba aculeus (Gould, 1841) - (RISSOIDAE)
- karici, Melanopsis karici P.S. Pavlovic, 1903 † - (MELANOPSIDAE) (FOSSIL)
- karikalensis, Leptoconus karikalensis Cossmann, 1900 † - (CONIDAE) (FOSSIL)
- karikalensis, Ranella karikalensis A.E.M. Cossmann, 1903 - syn of: Aspa marginata (J.F. Gmelin, 1791) - (RANELLIDAE)
- karikalensis, Solariella karikalensis A.E.M. Cossmann, 1911 † - (SOLARIELLIDAE) (FOSSIL)
- karikalensis, Laevistrombus karikalensis (A.E.M. Cossmann, 1903 †) - (STROMBIDAE) (FOSSIL)
- karinae, Hesperisternia karinae (G.W. Nowell-Usticke, 1959) - (BUCCINIDAE)
- karinae, Pisania karinae G.W. Nowell-Usticke, 1959 - syn of: Hesperisternia karinae (G.W. Nowell-Usticke, 1959) - (BUCCINIDAE)
- karinae, Conus karinae G.W. Nowell-Usticke, 1968 - syn of: Conasprella mindana (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- karinae, Latirus karinae G.W. Nowell-Usticke, 1969 - syn of: Pustulatirus virginensis (R.T. Abbott, 1958) - (FASCIOLARIIDAE)
- karinae, Graecina karinae R. von Cosel, 2006 - (LUCINIDAE)
- karinae, Phrontis karinae (G.W. Nowell-Usticke, 1971) - (NASSARIIDAE)
- kariyana, Ancula kariyana K. Baba, 1990 - (GONIODORIDIDAE)
- karkarensis, Pronoella karkarensis Ronchetti, 1970 † - (ARCTICIDAE) (FOSSIL)
- karkarensis, Cimomia karkarensis F. Haas & Miller, 1952 † - (HERCOGLOSSIDAE) (FOSSIL)
- karki, Joleaudella karki Öpik, 1930 † - (BELLEROPHONTIDAE) (FOSSIL)
- karlae, Coelocaulus karlae Rohr & al., 2003 † - (MURCHISONIIDAE) (FOSSIL)
- karlikensis, Kolihadiscus karlikensis (Horný, 2005 †) - (CYRTOLITIDAE) (FOSSIL)
- karlikensis, Cyrtodiscus karlikensis Horný, 2005 † - syn of: Kolihadiscus karlikensis (Horný, 2005 †) - (SINUITIDAE) (FOSSIL)
- karlini, Alvania karlini A.H. Clarke, 1963 - (RISSOIDAE)
- karlmartini, Nuculana karlmartini N.E. Weisbord, 1964 - (NUCULANIDAE)
- karlschmidti, Conus karlschmidti C.J. Maury, 1917 † - (CONIDAE) (FOSSIL)
- karlschmidti, Astralium karlschmidti C.J. Maury, 1917 † - (TURBINIDAE) (FOSSIL)
- Karlschmidtia, Subgenus Epiphragmophora (Karlschmidtia) F. Haas, 1955 (EPIPHRAGMOPHORIDAE)
- karlsteinensis, Cyclonema karlsteinensis J. Perner, 1903 † - (PLATYCERATIDAE) (FOSSIL)
- karlukovoensis, Alinda biplicata karlukovoensis I. Dedov, 2009 - (CLAUSILIIDAE)
- Karlwaageites, Genus Karlwaageites Cooper, 1994 † (AMMONOIDEA (unassigned)) (FOSSIL)
- karnaniense, Deroceras karnaniense A. Wiktor, 1984 - (AGRIOLIMACIDAE)
- karnekampi, Sinoennea karnekampi W.J.M. Maassen, 1999 - (DIAPHERIDAE)
- Karnekampia, Genus Karnekampia H.P. Wagner, 1988 (PECTINIDAE)
- Karoceras, Genus Karoceras Roussanoff, 1909 † (KAROCERATIDAE) (FOSSIL)
- KAROCERATIDAE Teichert, 1939 † - Family (CEPHALOPODA-NAUTILOIDEA-ONCOCERIDA) (FOSSIL)
- karoensis, Diplommatina karoensis W.J.M. Maassen, 2002 - (DIPLOMMATINIDAE)
- karokorum, Vespericola karokorum R.R. Talmadge, 1962 - syn of: Vespericola karakorum R.R. Talmadge, 1962 - (POLYGYRIDAE)
- karolinae, Melanella karolinae W. Engl, 2006 - (EULIMIDAE)
- Karolus, Subgenus Cecilioides (Karolus) L. de Folin in L. de Folin & R. Perrier, 1870 (FERUSSACIIDAE)
- karooensis, Tihkia karooensis (L.R. Cox, 1932 †) - (SILESUNIONIDAE) (FOSSIL)
- karooensis, Unio karooensis L.R. Cox, 1932 † - syn of: Tihkia karooensis (L.R. Cox, 1932 †) - (UNIONIDAE) (FOSSIL)
- karoroensis, Tritia karoroensis (P.A. Maxwell, 1988 †) - (NASSARIIDAE) (FOSSIL)
- karpa, Aphelodoris karpa N.G. Wilson, 2003 - (DORIDIDAE)
- karpatensis, Mareleptopoma karpatensis R.G. Moolenbeek, 1984 - (PICKWORTHIIDAE)
- karpathoensis, Pusia karpathoensis F. Nordsieck, 1969 - syn of: Mitromorpha karpathoensis (F. Nordsieck, 1969) - (COSTELLARIIDAE)
- karpathoensis, Mitromorpha karpathoensis (F. Nordsieck, 1969) - (MITROMORPHIDAE)
- karpathoensis, Alvania colossophilus karpathoensis F. Nordsieck, 1972 - (RISSOIDAE)
- karpathoensis, Jujubinus karpathoensis F. Nordsieck, 1973 - (TROCHIDAE)
- karpathoensis aegeensis, Jujubinus karpathoensis aegeensis F. Nordsieck, 1982 - (TROCHIDAE)
- karpatoensis, Mitromorpha karpatoensis F. Nordsieck, 1969 - syn of: Mitromorpha karpathoensis (F. Nordsieck, 1969) - (MITROMORPHIDAE)
- karpinskii, Proshumardites karpinskii (Rauser-Chernousova, 1928 †) - (AGATHICERATIDAE) (FOSSIL)
- karpinskii, Clymenia karpinskii E. Perna, 1914 † - syn of: Genuclymenia karpinskii (E. Perna, 1914 †) - (CLYMENIIDAE) (FOSSIL)
- karpinskii, Genuclymenia karpinskii (E. Perna, 1914 †) - (CYMACLYMENIIDAE) (FOSSIL)
- karpinskii, Monitoceras karpinskii Janischewsky, 1900 † - (GASTRIOCERATIDAE) (FOSSIL)
- karpinskii, Nordophiceras karpinskii (Mojsisovics, 1886 †) - (MEEKOCERATIDAE) (FOSSIL)
- karpinskii, Paragastrioceras karpinskii Fredericks, 1915 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- karpinskii, Pseudopronorites karpinskii (Librovitch, 1939 †) - (PRONORITIDAE) (FOSSIL)
- karpinskyana, Medlicottia karpinskyana Krotow, 1885 † - (MEDLICOTTIIDAE) (FOSSIL)
- karpinskyi, Anarcestes karpinskyi Holzapfel, 1895 † - syn of: Cabrieroceras crispiforme (Kayser, 1879 †) - (ANARCESTIDAE) (FOSSIL)
- karpinskyi, Ceratites karpinskyi Smith, 1914 † - syn of: Frechites occidentalis (Smith, 1914 †) - (CERATITIDAE) (FOSSIL)
- karpinskyi, Waagenoceras karpinskyi Miller, 1944 † - (CYCLOLOBIDAE) (FOSSIL)
- karpinskyi, Goniatites karpinskyi Holzapfel, 1895 † - syn of: Cabrieroceras crispiforme (Kayser, 1879 †) - (GONIATITIDAE) (FOSSIL)
- karpinskyi, Nautilus karpinskyi Karakasch, 1907 † - syn of: Palelialia karpinskyi (Karakasch, 1907 †) - (NAUTILIDAE) (FOSSIL)
- karpinskyi, Stacheoceras karpinskyi C. Gemmellaro, 1887 † - (NEOSTACHEOCERATIDAE) (FOSSIL)
- karpinskyi, Neptunoceras karpinskyi Shimansky, 1949 † - (NEPTUNOCERATIDAE) (FOSSIL)
- karpinskyi, Palelialia karpinskyi (Karakasch, 1907 †) - (PSEUDONAUTILIDAE) (FOSSIL)
- karpinskyi, Spyroceras karpinskyi P.A. Zhuravleva, 1962 † - (SPYROCERATIDAE) (FOSSIL)
- karpinskyi, Sturia karpinskyi Mojsisovics, 1902 † - (STURIIDAE) (FOSSIL)
- karpovi, Melanopsis nobilis karpovi Gozhik in Gozhik & Datsenko, 2007 † - (MELANOPSIDAE) (FOSSIL)
- karraculum, Hyptiotheca karraculum Bengtson & al., 1990 † - (HYOLITHIDA (unassigned)) (FOSSIL)
- karreri, Coelostylina karreri E.A.L. Kittl, 1894 † - (COELOSTYLINIDAE) (FOSSIL)
- karreri, Lithoconus karreri Hoernes & Auinger, 1879 † - (CONIDAE) (FOSSIL)
- karreri, Lacuna karreri E.A.L. Kittl, 1892 † - (LITTORINIDAE) (FOSSIL)
- karreri, Lobites karreri Mojsisovics, 1875 † - (LOBITIDAE) (FOSSIL)
- karrooensis, Tihkia karrooensis L.R. Cox, 1932 † - syn of: Tihkia karooensis (L.R. Cox, 1932 †) - (SILESUNIONIDAE) (FOSSIL)
- karsaklense, Umbetoceras karsaklense Ruzhencev & Bogoslovskaya, 1978 † - (HOMOCERATIDAE) (FOSSIL)
- karsteni, Ancilla karsteni (A.H.E. Beyrich, 1853 †) - (ANCILLARIIDAE) (FOSSIL)
- karsteni, Toxoceratoides karsteni (Uhlig, 1883 †) - (ANCYLOCERATIDAE) (FOSSIL)
- karsteni, Architectonica karsteni R.F. Rutsch, 1934 - (ARCHITECTONICIDAE)
- karsteni, Venezoliceras karsteni (Stieler, 1920 †) - (BRANCOCERATIDAE) (FOSSIL)
- karsteni, Cancellaria karsteni Anderson, 1929 † - syn of: Euclia codazzii F.M. Anderson, 1929 † - (CANCELLARIIDAE) (FOSSIL)
- karsteni, Neodeshayesites karsteni (Marcou, 1875 †) - (DESHAYESITIDAE) (FOSSIL)
- karsteni, Melanella karsteni Anderson, 1928 † - (EULIMIDAE) (FOSSIL)
- karsteni, Rissoa karsteni Janssen, 1978 † - (RISSOIDAE) (FOSSIL)
- karsteniana, Neniops karsteniana (W.L.H. Dohrn, 1860) - (CLAUSILIIDAE)
- karsteniana magistra, Neniops karsteniana magistra (G.B. Sowerby, 1892) - (CLAUSILIIDAE)
- Karsteniceras, Genus Karsteniceras Royo , 1945 † (LEPTOCERATOIDIDAE) (FOSSIL)
- karstenii, Ceratites karstenii (Klipstein, 1843 †) - (CERATITIDAE) (FOSSIL)
- karstenioides, Toxoceratoides karstenioides Vasicek & Skupien, 2002 † - (ANCYLOCERATIDAE) (FOSSIL)
- karsticus, Potamolithus karsticus L.R.L. Simone & N. Moracchioli, 1994 - (LITHOGLYPHIDAE)
- karubar, Microsveltia karubar A. Verhecken, 1997 - (CANCELLARIIDAE)
- karubar, Gemmuloborsonia karubar A.V. Sysoev & P. Bouchet, 1996 - (CLAVATULIDAE)
- karubar, Muusoctopus karubar (M.D. Norman, F.G. Hochberg & C.C. Lu, 1997) - (ENTEROCTOPODIDAE)
- karubari, Dulcina karubari R. von Cosel & P. Bouchet, 2008 - (LUCINIDAE)
- Karucia, Genus Karucia P. Glöer & V.M. Pešic, 2013 (HYDROBIIDAE)
- karui, Ratnadvipia karui Raheem & F. Naggs, 2006. - (ARIOPHANTIDAE)
- karukera, Haplocochlias karukera F. Rubio & E. Rolán, 2015 - (SKENEIDAE)
- karukeraensis, Anachis karukeraensis J. Pelorce & M.J. Faber, 2013 - (COLUMBELLIDAE)
- karukeraensis, Dendrodoris karukeraensis J.A. Ortea, J. Espinosa, G.M. Caballer & Y. Buske, 2012 - (DENDRODORIDIDAE)
- karukeraensis, Splendrillia karukeraensis P.J. Fallon, 2016 - (DRILLIIDAE)
- karukerensis, Pygmaepterys karukerensis B. Garrigues & D. Merle, 2014 - (MURICIDAE)
- Karukerina, Genus Karukerina J.A. Ortea, 2013 (RUNCINIDAE)
- Kasachia, syn of: Genus Kazachia Bazhenova, 1971 † (NUCULIDA (unassigned)) (FOSSIL)
- kasachstani, Macrochlamys kasachstani Y. Tzvetkov, 1940 - syn of: Macrochlamys clessini C.A. Westerlund, 1902 - (ARIOPHANTIDAE)
- kasachstanica, Pleuroclymenia kasachstanica Kind, 1944 † - (PLATYCLYMENIIDAE) (FOSSIL)
- kasaiensis, Zonitarion kasaiensis G.A. de Mol, 1970 - (UROCYCLIDAE)
- kasaii, Latitrigonia kasaii K. Maeda, 1963 † - (TRIGONIIDAE) (FOSSIL)
- kasanenkoi, Kolymia kasanenkoi Astaf'yeva & Kusnezov, 1988 † - (KOLYMIIDAE) (FOSSIL)
- kasanensis, Palaeolima kasanensis (Netschajew, 1894 †) - (LIMIDAE) (FOSSIL)
- kasanensis, Loxonema kasanensis Netchaev, 1894 † - syn of: Arribazona kasanensis (Netchaev, 1894 †) - (LOXONEMATIDAE) (FOSSIL)
- kasanensis, Arribazona kasanensis (Netchaev, 1894 †) - (MURCHISONIIDAE) (FOSSIL)
- kasanensis, Polidevcia kasanensis (de Verneuil, 1845 †) - (NUCULANIDAE) (FOSSIL)
- kasanensis, Siphogrammysia kasanensis (H.B. Geinitz, 1880 †) - (SANGUINOLITIDAE) (FOSSIL)
- kasanensis, Janeia kasanensis Netschajew, 1894 † - (SOLEMYIDAE) (FOSSIL)
- kasatka, Littorina kasatka D.G. Reid, N.I. Zaslavskaya & Sergievsky, 1991 - (LITTORINIDAE)
- kaschewarowi, Glycymeris kaschewarowi Grewingk, 1850 - syn of: Glycymeris septentrionalis (A.T. von Middendorff, 1849) - (GLYCYMERIDIDAE)
- kaschirtzevi, Praekolymia kaschirtzevi A.G. Kuznetsov & Biakov, 2014 † - (KOLYMIIDAE) (FOSSIL)
- Kaschkadakia, Genus Kaschkadakia † (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- kaschpurica, Viviparus kaschpurica (Pavlov, 1925 †) - (VIVIPARIDAE) (FOSSIL)
- kasei, Neritopsis kasei S. Kiel & K. Bandel, 2004 † - (NERITOPSIDAE) (FOSSIL)
- Kaseiella, Genus Kaseiella Frýda, 1998 † (MURCHISONIOIDEA (unassigned)) (FOSSIL)
- Kaseilla, Genus Kaseilla R.G. Moolenbeek & H.J. Hoenselaar, 2010 (PICKWORTHIIDAE)
- kashewarowi, Glycymeris kashewarowi Grewingk, 1848 † - (GLYCYMERIDIDAE) (FOSSIL)
- kashimaensis, Emarginula kashimaensis T. Shikama, 1962 - (FISSURELLIDAE)
- kashimana, Cardiomya kashimana T.A. Okutani & K. Sakurai, 1964 - (CUSPIDARIIDAE)
- kashimanum, Buccinum kashimanum T.A. Okutani, 1964 - (BUCCINIDAE)
- kashirtzevi, Valhallites kashirtzevi Shimanskiy, 1967 † - (TRIGONOCERATIDAE) (FOSSIL)
- kashirzevi, Tumaroceras kashirzevi Andrianov, 1985 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- kashiwajimensis, Globiscala kashiwajimensis M. Azuma, 1962 - syn of: Globiscala bullata (G.B. II Sowerby, 1844) - (EPITONIIDAE)
- kashiwajimensis, Phenacovolva kashiwajimensis C.N. Cate & M. Azuma in C.N. Cate, 1973 - syn of: Phenacovolva rehderi C.N. Cate, 1973 - (OVULIDAE)
- kashmirensis, Digoniostoma kashmirensis (G. Nevill, 1884) - (BITHYNIIDAE)
- kashmirensis, Corbicula kashmirensis W. Theobald, 1876 - syn of: Corbicula cashmiriensis G.P. Deshayes, 1854 - (CYRENIDAE)
- kashmirensis, Lymnaea kashmirensis B. Prashad, 1925 - (LYMNAEIDAE)
- kashmirensis, Sphaerium kashmirensis B. Prashad, 1937 - (SPHAERIIDAE)
- kashmiricus, Subinyoites kashmiricus (Diener, 1913 †) - (INYOITIDAE) (FOSSIL)
- kashmiricus, Praeundulomya kashmiricus (Reed, 1932 †) - (SANGUINOLITIDAE) (FOSSIL)
- Kashmirites, Genus Kashmirites Mathews, 1929 † (PRIONITIDAE) (FOSSIL)
- KASHMIRITIDAE Spath, 1934 † - Family (CEPHALOPODA-AMMONOIDEA-CERATITIDA) (FOSSIL)
- Kasimlarceltites, Genus Kasimlarceltites Lukeneder & Lukeneder, 2014 † (CELTITIDAE) (FOSSIL)
- kasium, Deroceras kasium W. Rähle, 1993 - (AGRIOLIMACIDAE)
- Kaskakia, Genus Kaskakia P. Glöer & V.M. Pešic, 2012 (HYDROBIIDAE)
- kasnakowi, Macrochlamys kasnakowi (C.A. Westerlund, 1898) - (ARIOPHANTIDAE)
- kasnakowi, Pseudonapaeus kasnakowi C.A. Westerlund, 1898 - (ENIDAE)
- kasnakowi, Hyalinia kasnakowi C.A. Westerlund, 1898 - syn of: Macrochlamys kasnakowi (C.A. Westerlund, 1898) - (ZONITIDAE)
- Kasperia, Subgenus Limax (Kasperia) H.H. Godwin-Austen, 1914 (LIMACIDAE)
- kaspiewi, Dosinia kaspiewi E. Fischer-Piette, 1967 - (VENERIDAE)
- kassenbergensis, Otostoma kassenbergensis S. Kiel & K. Bandel, 2004 † - (NERITIDAE) (FOSSIL)
- kassiana, Natica kassiana Wissmann, 1841 † - syn of: Hollandites spivaki (McLearn, 1946 †) - (NATICIDAE) (FOSSIL)
- kassitiana, Fusiaphera kassitiana J.M. Pacaud, Ledon & Loubry, 2015 † - (CANCELLARIIDAE) (FOSSIL)
- Kastanoceras, Genus Kastanoceras Kennedy & Cobban, 1990 † (ACANTHOCERATIDAE) (FOSSIL)
- kastoriae, Montenegrina kastoriae (H. Nordsieck, 1972) - (CLAUSILIIDAE)
- kastoriae prespaensis, Montenegrina kastoriae prespaensis H. Nordsieck, 1988 - (CLAUSILIIDAE)
- kastoriae sinosi, Montenegrina kastoriae sinosi B. Páll-Gergely, 2010 - (CLAUSILIIDAE)
- kastorias, Bithynia kastorias P. Glöer, C. Albrecht & T. Wilke, 2007 - (BITHYNIIDAE)
- kastoroae, Nipponaphera kastoroae (A. Verhecken, 1997) - (CANCELLARIIDAE)
- kastoroae, Axelella kastoroae A. Verhecken, 1997 - syn of: Nipponaphera kastoroae (A. Verhecken, 1997) - (CANCELLARIIDAE)
- kastoroae, Epitonium kastoroae E.F. Garcia, 2003 - (EPITONIIDAE)
- kastoroae, Lucinoma kastoroae R. von Cosel & P. Bouchet, 2008 - (LUCINIDAE)
- kastoroae, Leptotrophon kastoroae R. Houart, 1997 - (MURICIDAE)
- kastriatae, Metahedenstroemia kastriatae (Arthaber, 1911 †) - (LANCEOLITIDAE) (FOSSIL)
- kasyotonis, Satsuma kasyotonis J.T. Kuroda & T. Kano, 1941 - (CAMAENIDAE)
- kasyotonis, Luchuena eucharista kasyotonis (J.T. Kuroda, 1945) - (ENIDAE)
- Katacanites, Genus Katacanites Kullmann, 1963 † (PROLECANITIDA (unassigned)) (FOSSIL)
- Katadesmia, Genus Katadesmia W.H. Dall, 1908 (MALLETIIDAE)
- Katageioceras, Genus Katageioceras Zhuravleva, 1972 † (DISCOSORIDA (unassigned)) (FOSSIL)
- Katakosmokeras, Genus Katakosmokeras Buckman, 1925 † (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- katalexis, Mexichromis katalexis N. Yonow, 2001 - (CHROMODORIDIDAE)
- katana, Nipponoteuthis katana Iba & al., 2014 † - (NIPPONOTEUTHIDAE) (FOSSIL)
- katangana, Lanistes katangana H.A. Pilsbry & J.C. Bequaert, 1927 - syn of: Cleopatra nsendweensis katangana (H.A. Pilsbry & J.C. Bequaert, 1927) - (AMPULLARIIDAE)
- katangana, Cleopatra nsendweensis katangana (H.A. Pilsbry & J.C. Bequaert, 1927) - (PALUDOMIDAE)
- katangense, Pisidium katangense H.A. Pilsbry & J.C. Bequaert, 1927 - syn of: Pisidium kenianum H.B. Preston, 1911 - (SPHAERIIDAE)
- Katastoma, syn of: Subgenus Brachypodella (Brevipedella) H.A. Pilsbry, 1903 (UROCOPTIDAE)
- Katayama, syn of: Genus Oncomelania Gradler, 1881 (POMATIOPSIDAE)
- katchekense, Dentalium katchekense E. Fischer-Piette & M. Nicklés, 1946 - (DENTALIIDAE)
- katchhensis, Myurella katchhensis E.W. Vredenburg, 1925 † - (TEREBRIDAE) (FOSSIL)
- Katelysia, Genus Katelysia A. Römer, 1857 (VENERIDAE)
- katerana, Amplirhagada katerana G.A. Solem, 1981 - (CAMAENIDAE)
- katerinae, Turanena katerinae E. Gittenberger, 1996 - (ENIDAE)
- kateruensis, Anomia kateruensis Hislop, 1859 † - (ANOMIIDAE) (FOSSIL)
- katerythros, Hypselodoris katerythros N. Yonow, 2001 - syn of: Hypselodoris katherythros N. Yonow, 2001 - (CHROMODORIDIDAE)
- katha, Purpuradusta katha T. Iredale, 1939 - syn of: Purpuradusta microdon (J.E. Gray, 1828) - (CYPRAEIDAE)
- Kathadena, syn of: Genus Rhynchotrochus O.F. von Möllendorff, 1895 (CAMAENIDAE)
- kathae, Thuridilla kathae T.M. Gosliner, 1995 - (PLAKOBRANCHIDAE)
- Katharina, Genus Katharina J.E. Gray, 1847 (MOPALIIDAE)
- katharinae, Unipeltoceras katharinae Jeannet, 1951 † - (ASPIDOCERATIDAE) (FOSSIL)
- katherina, Benthastelena katherina T. Iredale, 1936 - (CALLIOSTOMATIDAE)
- katherinae, Hexaplex katherinae E.H. Vokes, 1968 † - (MURICIDAE) (FOSSIL)
- katherinae, Cingula katherinae P. Bartsch, 1911 - syn of: Boreocingula martyni (W.H. Dall, 1886) - (RISSOIDAE)
- katherinae, Bankia katherinae W.J. Clench & H. Turner, 1946 - syn of: Bankia campanellata C.E. von Moll & G.F. Roch, 1931 - (TEREDINIDAE)
- katherinae, Bassina katherinae J. Marwick, 1948 - (VENERIDAE)
- Katherinella, Subgenus Pitar (Katherinella) Tegland, 1929 † (VENERIDAE) (FOSSIL)
- katherinepalmerae, Lucina katherinepalmerae N.E. Weisbord, 1964 - (LUCINIDAE)
- katherythros, Hypselodoris katherythros N. Yonow, 2001 - (CHROMODORIDIDAE)
- kathiae, Bostryx kathiae A.S.H. Breure, 1978 - (BULIMULIDAE)
- kathieae, Bathoxiphus kathieae V. Scarabino & F. Scarabino, 2010 - (ENTALINIDAE)
- kathiewayae, Vexillum kathiewayae R. Salisbury, M. Herrmann & A.M. Dekkers, 2012 - (COSTELLARIIDAE)
- kathiewayae, Pseudocyphoma kathiewayae C.N. Cate, 1973 - syn of: Cyphoma intermedium (G.B. I Sowerby, 1828) - (OVULIDAE)
- kathiewayae, Turbonilla kathiewayae A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- kathiewayae, Turris kathiewayae R.N. Kilburn, A.E. Fedosov & B.M. Olivera, 2012 - (TURRIDAE)
- kathiewayae, Pitar kathiewayae K.L. Lamprell & R.N. Kilburn, 1999 - (VENERIDAE)
- kathiewayana, Colubraria kathiewayana E.J. Fittkau & M. Parth, 1993 - (COLUBRARIIDAE)
- kathleenae, Trizonoceras kathleenae Moore, 1936 † - (DIMORPHOCERATIDAE) (FOSSIL)
- kathleenae, Epistroboceras kathleenae Ramsbottom & Moore † - (TRIGONOCERATIDAE) (FOSSIL)
- kathmandica, Cylindrophaedusa kathmandica H. Nordsieck, 1973 - (CLAUSILIIDAE)
- Kathocardia, syn of: Genus Trachycardium O.A.L. Mörch, 1853 (CARDIIDAE)
- kathrinae, Pseudobithynia kathrinae P. Glöer & U. Bössneck, 2007 - (BITHYNIIDAE)
- kathrini, Pseudobithynia kathrini P. Glöer & U. Bössneck, 2007 - syn of: Pseudobithynia kathrinae P. Glöer & U. Bössneck, 2007 - (BITHYNIIDAE)
- kathwayae, Dentalium kathwayae K.L. Lamprell & J.M. Healy, 1998 - (DENTALIIDAE)
- kathyae, Fenimorea kathyae D.L. Tippett, 1995 - (DRILLIIDAE)
- katiae, Drillia katiae F. Nolf, 2006 - (DRILLIIDAE)
- katiawarensis, Pelecyora katiawarensis (E. Fischer-Piette & B. Métivier, 1971) - (VENERIDAE)
- katieae, Cyrtodaria katieae Marincovich Jr., 1993 † - (HIATELLIDAE) (FOSSIL)
- katieae, Towaipecten katieae A.G. Beu, 1995 † - (PECTINIDAE) (FOSSIL)
- katipoides, Runcina katipoides (M.C. Miller & W.B. Rudman, 1968) - (RUNCINIDAE)
- katjawarana, Basedowena katjawarana G.A. Solem, 1993 - (CAMAENIDAE)
- katlabuhensis, Caspia katlabuhensis Roshka, 1973 † - (HYDROBIIDAE) (FOSSIL)
- katoi, Loxobucania katoi (T. Kobayashi, 1930 †) - (BUCANIIDAE) (FOSSIL)
- katoi, Calliostoma katoi (K. Sakurai, 1994) - (CALLIOSTOMATIDAE)
- katoi, Glossodoris katoi K. Baba, 1938 - (CHROMODORIDIDAE)
- katoi, Hirasea katoi T. Habe, 1973 - (ENDODONTIDAE)
- katoi, Onoceras katoi T. Kobayashi † - (ONCOCERATIDAE) (FOSSIL)
- katoi, Hemiprionites katoi (Yehara, 1927 †) - (PRIONITIDAE) (FOSSIL)
- katoi, Scalites katoi T. Kobayashi, 1934 † - (RAPHISTOMATIDAE) (FOSSIL)
- katoi, Tibia katoi H. Noda & H. Watanabe, 1996 † - (ROSTELLARIIDAE) (FOSSIL)
- katoi, Lonoa katoi T. Habe, 1976 - (SEMELIDAE)
- katoi, Microgaza katoi (J.T. Kuroda & T. Habe, 1961) - (SOLARIELLIDAE)
- Katoptychia, Genus Katoptychia Perner, 1907 † (LOXONEMATIDAE) (FOSSIL)
- katorii, Japonia katorii H. Minato, 1985 - (CYCLOPHORIDAE)
- Katosira, Genus Katosira Koken, 1892 † (SETTSASSIIDAE) (FOSSIL)
- Katostoma, syn of: Genus Leptaxis R.T. Lowe, 1852 (HYGROMIIDAE)
- katowense, Paradentalium katowense (J.W. Brazier, 1877) - (DENTALIIDAE)
- katrinae, Hemiaclis katrinae W. Engl, 2006 - (EULIMIDAE)
- katrolensis, Indotrigonia katrolensis Agrawal, 1956 † - (TRIGONIIDAE) (FOSSIL)
- Katroliceras, Genus Katroliceras Spath † (ATAXIOCERATIDAE) (FOSSIL)
- Katrolites, Genus Katrolites † (AMMONOIDEA (unassigned)) (FOSSIL)
- katsharavai, Imerites katsharavai Rouchadze, 1933 † - syn of: Paraimerites katsharavai (Rouchadze, 1933 †) - (HEMIHOPLITIDAE) (FOSSIL)
- katsharavai, Imerites katsharavai Rouchadzé, 1933 † - syn of: Calanquites katsharavai (Rouchadzé, 1933 †) - (HEMIHOPLITIDAE) (FOSSIL)
- katsharavai, Paraimerites katsharavai (Rouchadze, 1933 †) - (HETEROCERATIDAE) (FOSSIL)
- katsharavai, Calanquites katsharavai (Rouchadzé, 1933 †) - (HETEROCERATIDAE) (FOSSIL)
- katsuae, Palmulacypraea katsuae (J.T. Kuroda, 1960) - (CYPRAEIDAE)
- katsuae, Notadusta katsuae J.T. Kuroda, 1960 - syn of: Palmulacypraea katsuae (J.T. Kuroda, 1960) - (CYPRAEIDAE)
- katsuae, Erronea katsuae J.T. Kuroda, 1960 - syn of: Palmulacypraea katsuae (J.T. Kuroda, 1960) - (CYPRAEIDAE)
- katsuae, Cypraea katsuae J.T. Kuroda, 1960 - syn of: Palmulacypraea katsuae (J.T. Kuroda, 1960) - (CYPRAEIDAE)
- katsuae, Vesicomya katsuae J.T. Kuroda, 1952 - (VESICOMYIDAE)
- katsuae guidoi, Palmulacypraea katsuae guidoi (F.Jr. Lorenz, 2002) - (CYPRAEIDAE)
- katsuae guidoi, Notadusta katsuae guidoi F.Jr. Lorenz, 2002 - syn of: Palmulacypraea katsuae guidoi (F.Jr. Lorenz, 2002) - (CYPRAEIDAE)
- katsunakamai, Calliostoma katsunakamai S. Kosuge, 1998 - (CALLIOSTOMATIDAE)
- katsurenensis, Coniglobus mercatorius katsurenensis T. Habe & M. Chinen, 1985 - (CAMAENIDAE)
- katsurensis, Actinodontophora katsurensis M. Ichikawa, 1951 † - (ACTINODONTOPHORIDAE) (FOSSIL)
- katsurensis, Costatoria katsurensis Nakazawa, 1967 † - (MYOPHORIIDAE) (FOSSIL)
- kattaensis, Bucania kattaensis L. Waagen, 1880 † - syn of: Retispira kattaensis (L. Waagen, 1880 †) - (BUCANIIDAE) (FOSSIL)
- kattaensis, Retispira kattaensis (L. Waagen, 1880 †) - (KNIGHTITIDAE) (FOSSIL)
- kattaensis, Phymatopleura kattaensis (L. Waagen, 1880 †) - (PHYMATOPLEURIDAE) (FOSSIL)
- kattaensis, Pleurotomaria kattaensis L. Waagen, 1880 † - syn of: Phymatopleura kattaensis (L. Waagen, 1880 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- kattingeri, Campylaea trizona kattingeri (H. Knipper, 1939) - (HELICIDAE)
- Katunioides, Genus Katunioides Aksarina, 1978 † (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- katurana, Coliracemata katurana W.F. Ponder, H. Fukuda & A. Hallan, 2014 - (CLENCHIELLIDAE)
- katurici, Gyraulus katurici (Š. Brusina, 1897) - (PLANORBIDAE)
- katwahiensis, Aviculopecten katwahiensis L. Waagen, 1881 † - (AVICULOPECTINIDAE) (FOSSIL)
- katyae, Chrystella katyae E. Rolán, J. Espinosa & R. Fernández-Garcés, 1991 - (PICKWORTHIIDAE)
- katzeri, Arthaberites katzeri Turina, 1912 † - (CERATITIDA (unassigned)) (FOSSIL)
- katzeri, Clivunella katzeri (Gorjanovic-Kramberger, 1909 †) - (CLAVATULIDAE) (FOSSIL)
- katzeri, Illyricocongeria katzeri (Kochansky-Devidé, 1978 †) - (DREISSENIDAE) (FOSSIL)
- katzeri, Melanopsis katzeri Š. Brusina, 1904 † - (MELANOPSIDAE) (FOSSIL)
- katzeri, Unio katzeri Š. Brusina, 1904 † - (UNIONIDAE) (FOSSIL)
- katzeri bicostatus, Unio katzeri bicostatus Žagar-Sakaè, 1986 † - syn of: Unio katzeri Š. Brusina, 1904 † - (UNIONIDAE) (FOSSIL)
- katzeri tricostatus, Unio katzeri tricostatus Žagar-Sakaè, 1986 † - syn of: Unio katzeri Š. Brusina, 1904 † - (UNIONIDAE) (FOSSIL)
- Katzeria, Genus Katzeria Sliskovic, 1966 † (RADIOLITIDAE) (FOSSIL)
- katzi, Acanthina katzi Fleming, 1972 † - (MURICIDAE) (FOSSIL)
- Kauaia, Genus Kauaia E.R. Sykes, 1900 (AMASTRIDAE)
- Kauaia, Genus Kauaia Waterhouse, 1963 † (AMASTRIDAE) (FOSSIL)
- kauaia, Arca kauaia (W.H. Dall, P. Bartsch & H.A. Rehder, 1938) - (ARCIDAE)
- kauaia, Tucetona kauaia (W.H. Dall, P. Bartsch & H.A. Rehder, 1938) - (GLYCYMERIDIDAE)
- kauaia, Ostrea kauaia W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Neopycnodonte cochlear (G.S. Poli, 1795) - (OSTREIDAE)
- kauaiensis, Achatinella kauaiensis W. Newcomb - syn of: Kauaia kauaiensis (W. Newcomb, 1860) - (ACHATINELLIDAE)
- kauaiensis, Kauaia kauaiensis (W. Newcomb, 1860) - (AMASTRIDAE)
- kauaiensis, Xenophorarca kauaiensis (W.H. Dall, P. Bartsch & H.A. Rehder, 1938) - (ARCIDAE)
- kauaiensis, Erosaria poraria kauaiensis J.C. Melvill, 1888 - (CYPRAEIDAE)
- kauaiensis, Philonesia kauaiensis H.B. Baker, 1940 - (EUCONULIDAE)
- kauaiensis, Pleuropoma kauaiensis H.A. Pilsbry & C.M. Cooke, 1908 - (HELICINIDAE)
- kauaiensis, Georissa kauaiensis H.A. Pilsbry, 1928 - (HYDROCENIDAE)
- kauaiensis, Mimachlamys kauaiensis (W.H. Dall, P. Bartsch & H.A. Rehder, 1938) - (PECTINIDAE)
- kauaiensis, Turbonilla kauaiensis H.A. Pilsbry & C.M. Cooke, 1917 - syn of: Turbonilla lirata (A. Adams, 1855) - (PYRAMIDELLIDAE)
- kauaiensis, Spondylus kauaiensis W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Spondylus mimus A.A. Olsson, 1931 - (SPONDYLIDAE)
- kauaiensis, Lyrodus kauaiensis (W.H. Dall, P. Bartsch & H.A. Rehder, 1938) - (TEREDINIDAE)
- kauaiensis, Melania kauaiensis W.H. Pease, 1870 - (THIARIDAE)
- kauaiensis, Nesopupa kauaiensis C.M.F. Ancey, 1904 - (VERTIGINIDAE)
- kauaiensis orientalis, Pleuropoma kauaiensis orientalis M.C. Neal, 1934 - (HELICINIDAE)
- kauaium, Parvamussium kauaium (W.H. Dall, P. Bartsch & H.A. Rehder, 1938) - (PROPEAMUSSIIDAE)
- kauensis, Amastra melanosis kauensis H.A. Pilsbry & C.M. Cooke, 1915 - (AMASTRIDAE)
- kaufeli, Cochlodina laminata kaufeli E. Gittenberger - (CLAUSILIIDAE)
- Kauffmanella, Genus Kauffmanella M.R. Cooper, 2015 † (PTEROTRIGONIIDAE) (FOSSIL)
- kauffmani, Pedioceras kauffmani H.A. Leanza, 1967 † - (ANCYLOCERATIDAE) (FOSSIL)
- kauffmani, Buchotrigonia kauffmani Villamil, 1992 † - (BUCHOTRIGONIIDAE) (FOSSIL)
- kauffmani, Marvacrassatella kauffmani Ward & B.W. Blackwelder, 1987 † - (CRASSATELLIDAE) (FOSSIL)
- kauffmani, Naticonema kauffmani Peel, 1975 † - (PLATYCERATIDAE) (FOSSIL)
- kauffmani, Rutitrigonia kauffmani H.A. Leanza, 1993 † - (RUTITRIGONIIDAE) (FOSSIL)
- kauffmani, Tellinimera kauffmani Marincovich Jr., 1993 † - (TELLINIDAE) (FOSSIL)
- kaufmanensis, Cucullaea kaufmanensis Gardner, 1935 † - (CUCULLAEIDAE) (FOSSIL)
- kaufmanni, Rotopericyclus kaufmanni D. Korn & al., 2010 † - (ROTOPERICYCLIDAE) (FOSSIL)
- kaufmanni, Irdanites kaufmanni Klug, 2001 † - (TEICHERTICERATIDAE) (FOSSIL)
- kaufmanni, Armatites kaufmanni W. Korn, 2014 † - (TORNOCERATIDAE) (FOSSIL)
- kauiensis, Lyrodus kauiensis W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Lyrodus pedicellatus (J.L.A. Quatrefages, 1849) - (TEREDINIDAE)
- kauilani, Erosaria kauilani A. Kenyon, 1900 - syn of: Erosaria erosa (C. Linnaeus, 1758) - (CYPRAEIDAE)
- kaukensis, Omphalocirrus kaukensis Gubanov & al., 1995 † - (OMPHALOCIRRIDAE) (FOSSIL)
- kaulensis, Devonorhineoderma kaulensis Heidelberger, 2003 † - (GOSSELETINIDAE) (FOSSIL)
- kaunakakai, Euconulus subtilissimus kaunakakai H.B. Baker, 1941 - (EUCONULIDAE)
- kaunakakaiensis, Amastra kaunakakaiensis H.A. Pilsbry & C.M. Cooke, 1914 - (AMASTRIDAE)
- Kaunhowenia, Genus Kaunhowenia Abdel Gawad, 1986 † (APORRHAIDAE) (FOSSIL)
- kaupakaluana, Partulina nivea kaupakaluana H.A. Pilsbry & C.M. Cooke, 1912 - (ACHATINELLIDAE)
- kaupakaluana, Amastra affinis kaupakaluana A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- kaupi, Cymbiola kaupi R.W. Dunker, 1863 - syn of: Cymbiola cymbiola (J.F. Gmelin, 1791) - (VOLUTIDAE)
- kaupii, Palaeozygopleura kaupii (G.A. Goldfuss, 1844 †) - (PALAEOZYGOPLEURIDAE) (FOSSIL)
- kaurna, Octopus kaurna T.N. Stranks, 1990 - (OCTOPODIDAE)
- Kaurnella, Genus Kaurnella Ludbrook, 1941 † (ARCHAEOGASTROPODA (unassigned)) (FOSSIL)
- kava, Tambja kava M. Pola, V. Padula, T.M. Gosliner & J.L. Cervera, 2014 - (POLYCERIDAE)
- kavalerovae, Yakutionautilus kavalerovae Arkhipov & I.S. Barskov, 1970 † - (TRIGONOCERATIDAE) (FOSSIL)
- kavasensis, Rhacophyllites kavasensis (Kovacs, 1942 †) - (DISCOPHYLLITIDAE) (FOSSIL)
- kavasensis, Paradasyceras kavasensis Kovacs, 1942 † - syn of: Rhacophyllites kavasensis (Kovacs, 1942 †) - (JURAPHYLLITIDAE) (FOSSIL)
- kavera, Minidonta kavera F.J. Brook, 2010 - (ENDODONTIDAE)
- kaviengensis, Ancilla kaviengensis Y.I. Kantor, A.E. Fedosov, N. Puillandre & P. Bouchet, 2016 - (ANCILLARIIDAE)
- kavirondica, Ferrissia kavirondica G. Mandahl-Barth, 1954 - (PLANORBIDAE)
- kavoricus, Hybochelus kavoricus H.S. Ladd, 1945 † - (CHILODONTIDAE) (FOSSIL)
- kavranensis, Chlamys kavranensis V.N. Sinelnikova, 1975 † - (PECTINIDAE) (FOSSIL)
- kavusani, Valvata kavusani H. Schütt in H. Schütt & Kavusan, 1984 † - (VALVATIDAE) (FOSSIL)
- kawabei, Thala kawabei M. Herrmann & M. Chino, 2015 - (COSTELLARIIDAE)
- kawaensis, Siphonalia kawaensis J.A. Bartrum 1919 - (BUCCINIDAE)
- kawaensis, Tugali kawaensis J.A. Bartrum 1919 - (FISSURELLIDAE)
- kawaguchi, Vitrinula kawaguchi T. Habe, 1961 - (ARIOPHANTIDAE)
- kawaiensis, Pseudohyalina kawaiensis (L. Pfeiffer, 1854) - (GASTRODONTIDAE)
- kawaiensis, Helix kawaiensis L. Pfeiffer, 1854 - syn of: Pseudohyalina kawaiensis (L. Pfeiffer, 1854) - (HELICIDAE)
- kawaiensis, Helix kawaiensis L.A. Reeve, 1854 - syn of: Hawaiia minuscula (A. Binney, 1841) - (HELICIDAE)
- kawaihapaiensis, Amastra antiqua kawaihapaiensis H.A. Pilsbry & C.M. Cooke, 1914 - (AMASTRIDAE)
- kawaiiki, Achatinella apexfulva kawaiiki D.A. Welch, 1942 - (ACHATINELLIDAE)
- kawaluensis, Sulcospira kawaluensis Marwoto & Isnaningsih, 2012 - (PACHYCHILIDAE)
- kawamotoae, Vexillum kawamotoae R. Salisbury, 2011 - (COSTELLARIIDAE)
- kawamotoi, Hemiphaedusa kawamotoi J.T. Kuroda & Is. Taki, 1944 - (CLAUSILIIDAE)
- kawamurai, Maxacteon kawamurai (T. Habe, 1952) - (ACTEONIDAE)
- kawamurai, Punctacteon kawamurai (T. Habe, 1952) - syn of: Maxacteon kawamurai (T. Habe, 1952) - (ACTEONIDAE)
- kawamurai, Aegista hatakedai kawamurai J.T. Kuroda & T. Habe, 1951 - (BRADYBAENIDAE)
- kawamurai, Ancistrolepis kawamurai T. Habe & K. Itô, 1972 - (BUCCINIDAE)
- kawamurai, Buccinum kawamurai T. Habe & K. Itô, 1965 - (BUCCINIDAE)
- kawamurai, Hamineobulla kawamurai T. Habe, 1950 - (BULLIDAE)
- kawamurai, Capulus kawamurai T. Habe, 1992 - syn of: Capulus danieli (J.C.H. Crosse, 1858) - (CAPULIDAE)
- kawamurai, Mundophaedusa kawamurai KItô & T. Habe, 1982 - (CLAUSILIIDAE)
- kawamurai, Leptoconus kawamurai T. Habe, 1962 - (CONIDAE)
- kawamurai, Cuspidaria kawamurai J.T. Kuroda, 1948 - syn of: Cuspidaria gigantea B. Prashad, 1932 - (CUSPIDARIIDAE)
- kawamurai, Cylichnella kawamurai T. Habe, 1958 - (CYLICHNIDAE)
- kawamurai, Fissidentalium kawamurai J.T. Kuroda & T. Habe in T. Habe, 1961 - (DENTALIIDAE)
- kawamurai, Amaea kawamurai M. Azuma, 1960 - syn of: Amaea splendida (M.E.A. de Boury, 1913) - (EPITONIIDAE)
- kawamurai, Epitonium kawamurai M. Azuma, 1960 - syn of: Amaea splendida (M.E.A. de Boury, 1913) - (EPITONIIDAE)
- kawamurai, Melanella kawamurai (J.T. Kuroda & T. Habe, 1950) - (EULIMIDAE)
- kawamurai, Stilifer kawamurai (T. Habe, 1976) - (EULIMIDAE)
- kawamurai, Eulima kawamurai T. Habe, 1961 - (EULIMIDAE)
- kawamurai, Puncturella kawamurai T. Habe, 1961 - (FISSURELLIDAE)
- kawamurai, Harpa major kawamurai T. Habe, 1973 - (HARPIDAE)
- kawamurai, Limaria kawamurai H. Masahito & T. Habe, 1972 - (LIMIDAE)
- kawamurai, Lyonsia kawamurai T. Habe, 1952 - (LYONSIIDAE)
- kawamurai, Dentimargo kawamurai (T. Habe, 1951) - (MARGINELLIDAE)
- kawamurai, Hemifusus kawamurai T. Kira, 1965 - (MELONGENIDAE)
- kawamurai, Ventomnestia kawamurai T. Habe, 1950 - syn of: Ventomnestia girardi (J.V. Audouin, 1826) - (MNESTIIDAE)
- kawamurai, Babelomurex kawamurai (T. Kira, 1959) - (MURICIDAE)
- kawamurai, Hirtomurex kawamurai (T. Shikama, 1978) - (MURICIDAE)
- kawamurai, Murex kawamurai T. Shikama, 1964 - syn of: Chicoreus axicornis (J.B.P.A. Lamarck, 1822) - (MURICIDAE)
- kawamurai, Chicoreus axicornis kawamurai T. Shikama, 1964 - (MURICIDAE)
- kawamurai, Natica kawamurai K. Sakurai, 1983 - (NATICIDAE)
- kawamurai, Nuculana pernula kawamurai T. Habe, 1961 - (NUCULANIDAE)
- kawamurai, Philine kawamurai (T. Habe, 1958) - (PHILINIDAE)
- kawamurai, Inquisitor kawamurai (T. Habe & S. Kosuge, 1966) - (PSEUDOMELATOMIDAE)
- kawamurai, Antiplanes kawamurai T. Habe, 1958 - syn of: Antiplanes obesus H. Ozaki, 1958 - (PSEUDOMELATOMIDAE)
- kawamurai, Rectiplanes kawamurai T. Habe, 1958 - syn of: Antiplanes obesus H. Ozaki, 1958 - (PSEUDOMELATOMIDAE)
- kawamurai, Thatcheriasyrinx orientis kawamurai (J.T. Kuroda, 1959) - (RAPHITOMIDAE)
- kawamurai, Semisulcospira kawamurai J.T. Kuroda, 1929 - (SEMISULCOSPIRIDAE)
- kawamurai, Pisidium kawamurai A. Mori, 1938 - (SPHAERIIDAE)
- kawamurai, Thyasira kawamurai T. Habe, 1951 - (THYASIRIDAE)
- kawamurai, Notosinister kawamurai S. Kosuge, 1962 - syn of: Costatophora iniqua (F.P. Jousseaume, 1898) - (TRIPHORIDAE)
- kawamurai, Akebiconcha kawamurai J.T. Kuroda, 1943 - (VESICOMYIDAE)
- kawamurai, Lyria kawamurai T. Habe, 1975 † - syn of: Plicolyria planicostata (G.B. III Sowerby, 1903 †) - (VOLUTIDAE) (FOSSIL)
- kawamurai, Amoria kawamurai T. Habe, 1975 - syn of: Amoria grayi kawamurai T. Habe, 1975 - (VOLUTIDAE)
- kawamurai, Amoria grayi kawamurai T. Habe, 1975 - (VOLUTIDAE)
- kawamurai, Volvatella kawamurai T. Habe, 1946 - (VOLVATELLIDAE)
- kawamurai helenae, Latiaxis kawamurai helenae M. Azuma, 1973 - syn of: Babelomurex helenae (M. Azuma, 1973) - (MURICIDAE)
- kawamurai helenae, Babelomurex kawamurai helenae M. Azuma, 1973 - syn of: Babelomurex helenae (M. Azuma, 1973) - (MURICIDAE)
- kawamurai hukuiense, Pisidium kawamurai hukuiense A. Mori, 1938 - syn of: Pisidium kawamurai A. Mori, 1938 - (SPHAERIIDAE)
- kawamurai sentix, Babelomurex kawamurai sentix F.M. Bayer, 1971 - syn of: Babelomurex sentix (F.M. Bayer, 1971) - (MURICIDAE)
- kawanai, Nipponochloritis kawanai E. Sorita, 1980 - (CAMAENIDAE)
- Kawanamia, Genus Kawanamia Kase, 1988 † (LOPHOSPIRIDAE) (FOSSIL)
- kawanensis, Saganoa kawanensis O. Masuda & T. Habe, 1984 - (HYDROBIIDAE)
- kawanishi, Conus kawanishi T. Shikama, 1970 - syn of: Hermes nussatella (C. Linnaeus, 1758) - (CONIDAE)
- kawanishii, Babelomurex kawanishii (S. Kosuge, 1979) - (MURICIDAE)
- kawanishii, Latiaxis kawanishii S. Kosuge, 1979 - syn of: Babelomurex kawanishii (S. Kosuge, 1979) - (MURICIDAE)
- Kawasakiceras, syn of: Genus Sactorthoceras Kobayashi, 1934 † (SACTORTHOCERATIDAE) (FOSSIL)
- kawasakii, Megalophaedusa kawasakii (J.T. Kuroda, 1936) - (CLAUSILIIDAE)
- kawasakii, Liospira kawasakii T. Kobayashi, 1930 † - syn of: Ceratopea kawasakii (T. Kobayashi, 1930 †) - (EOTOMARIIDAE) (FOSSIL)
- kawasakii, Orthoceras kawasakii T. Kobayashi, 1928 † - (ORTHOCERATIDAE) (FOSSIL)
- kawasakii, Ceratopea kawasakii (T. Kobayashi, 1930 †) - (RAPHISTOMATIDAE) (FOSSIL)
- kawauchidensis, Crassostrea kawauchidensis Tamura, 1977 † - (OSTREIDAE) (FOSSIL)
- kawauensis, Cookia kawauensis Powell, 1938 † - (TURBINIDAE) (FOSSIL)
- Kaweka, Genus Kaweka Marwick, 1931 † (TEREBRIDAE) (FOSSIL)
- kawhiae, Holcophylloceras kawhiae (Marshall, 1909 †) - (PHYLLOCERATIDAE) (FOSSIL)
- kawhiana, Vaugonia kawhiana (C.T. Trechmann, 1923 †) - (MYOPHORELLIDAE) (FOSSIL)
- kawhiana, Pinna kawhiana J. Marwick, 1953 † - (PINNIDAE) (FOSSIL)
- kawhiana, Trigonia kawhiana C.T. Trechmann, 1923 † - syn of: Vaugonia kawhiana (C.T. Trechmann, 1923 †) - (TRIGONIIDAE) (FOSSIL)
- kayae, Casmaria kayae J.A. Buijse, H. Dekker & G. Verbinnen, 2013 - (CASSIDAE)
- kayae, Hypselodoris kayae A.T. Young, 1967 - (CHROMODORIDIDAE)
- kayae, Neocancilla kayae W.O. Cernohorsky, 1978 - (MITRIDAE)
- kayae, Trophonopsis kayae T. Habe, 1981 - (MURICIDAE)
- kayae, Sinezona kayae D.L. Geiger & J.H. McLean, 2010 - (SCISSURELLIDAE)
- kayai, Chlupacites kayai (Kullmann, 1973 †) - (LATANARCESTIDAE) (FOSSIL)
- kayalensis, Barbatia kayalensis A. Dey, 1961 † - (ARCIDAE) (FOSSIL)
- kayalensis, Turricula kayalensis A. Dey, 1961 † - (CLAVATULIDAE) (FOSSIL)
- kayalensis, Volvarina kayalensis A. Dey, 1961 † - (MARGINELLIDAE) (FOSSIL)
- kayalensis, Comitas kayalensis A. Dey, 1962 - (PSEUDOMELATOMIDAE)
- kayalensis, Turritella kayalensis A. Dey, 1961 † - (TURRITELLIDAE) (FOSSIL)
- kayberensis, Subzebrinus kayberensis (C.M.F. Ancey, 1893) - (ENIDAE)
- kayeanum, Cymatoceras kayeanum (Blanford, 1861 †) - (CYMATOCERATIDAE) (FOSSIL)
- kayei, Ammonites kayei E. Forbes, 1846 † - syn of: Gaudryceras kayei (E. Forbes, 1846 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- kayei, Vertebrites kayei E. Forbes, 1846 † - syn of: Gaudryceras kayei (E. Forbes, 1846 †) - (AMMONOIDEA (unassigned)) (FOSSIL)
- kayei, Cypraea kayei E. Forbes, 1846 † - (CYPRAEIDAE) (FOSSIL)
- kayei, Gaudryceras kayei (E. Forbes, 1846 †) - (GAUDRYCERATIDAE) (FOSSIL)
- kayi, Bassleroceras kayi Ulrich & al., 1944 † - (BASSLEROCERATIDAE) (FOSSIL)
- kayi, Barroisiceras kayi Benavides-Caceres, 1956 † - (COLLIGNONICERATIDAE) (FOSSIL)
- kayi, Metalegoceras kayi Glenister & al., 1973 † - (METALEGOCERATIDAE) (FOSSIL)
- kayiani, Plectostoma kayiani T.S. Liew, J.J. Vermeulen & alias, 2014 - (DIPLOMMATINIDAE)
- kaykayae, Vitrinella kaykayae E. Rolán & J. Sellanes, 2004 - (TORNIDAE)
- Kayoceras, Genus Kayoceras Foerste, 1934 † (LOWOCERATIDAE) (FOSSIL)
- kayseri, Fidelites kayseri (Wedekind, 1918 †) - (AGONIATITIDAE) (FOSSIL)
- kayseri, Mesobeloceras kayseri (Holzapfel, 1882 †) - (BELOCERATIDAE) (FOSSIL)
- kayseri, Clymenia kayseri Drevermann, 1901 † - syn of: Kirsoceras kayseri (Drevermann, 1901 †) - (CLYMENIIDAE) (FOSSIL)
- kayseri, Cyrtodonta kayseri Frech, 1891 † - (CYRTODONTIDAE) (FOSSIL)
- kayseri, Naticopsis kayseri Holzapfel, 1895 † - (DELPHINULOPSIDAE) (FOSSIL)
- kayseri, Eotomaria kayseri A.H. Clarke & Ruedemann, 1903 † - syn of: Pleurorima kayseri (A.H. Clarke & Ruedemann, 1903 †) - (EOTOMARIIDAE) (FOSSIL)
- kayseri, Gephyroceras kayseri Wedekind, 1918 † - syn of: Ponticeras kayseri (Wedekind, 1918 †) - (GEPHUROCERATIDAE) (FOSSIL)
- kayseri, Goniatites kayseri Holzapfel, 1882 † - syn of: Mesobeloceras kayseri (Holzapfel, 1882 †) - (GONIATITIDAE) (FOSSIL)
- kayseri, Pleurorima kayseri (A.H. Clarke & Ruedemann, 1903 †) - (GOSSELETINIDAE) (FOSSIL)
- kayseri, Euryzone kayseri (E.F.R.K. Koken, 1889 †) - (GOSSELETINIDAE) (FOSSIL)
- kayseri, Lahnospira kayseri (Ulrich, 1892 †) - (GOSSELETINIDAE) (FOSSIL)
- kayseri, Kirsoceras kayseri (Drevermann, 1901 †) - (KIRSOCERATIDAE) (FOSSIL)
- kayseri, Loxonema kayseri Holzapfel, 1895 † - (LOXONEMATIDAE) (FOSSIL)
- kayseri, Palaeoneilo kayseri Beushausen, 1895 † - (MALLETIIDAE) (FOSSIL)
- kayseri, Palorthoceras kayseri Kröger & al., 2007 † - (ORTHOCERATIDAE) (FOSSIL)
- kayseri, Pharciceras kayseri Wedekind, 1918 † - (PHARCICERATIDAE) (FOSSIL)
- kayseri, Pleurotomaria kayseri E.F.R.K. Koken, 1889 † - syn of: Euryzone kayseri (E.F.R.K. Koken, 1889 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- kayseri, Pleurotomaria kayseri Ulrich, 1892 † - syn of: Lahnospira kayseri (Ulrich, 1892 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- kayseri, Ponticeras kayseri (Wedekind, 1918 †) - (PONTICERATIDAE) (FOSSIL)
- kayseri, Alpinites kayseri (Schindewolf, 1923 †) - (POSTTORNOCERATIDAE) (FOSSIL)
- kayseri, Wedekindoceras kayseri Schindewolf, 1923 † - syn of: Alpinites kayseri (Schindewolf, 1923 †) - (POSTTORNOCERATIDAE) (FOSSIL)
- kayseri, Barroisocaulus kayseri (Spitz, 1907 †) - (PTYCHOCAULIDAE) (FOSSIL)
- kayseriensis, Pseudamnicola kayseriensis P. Glöer, M.Z. Yildirim & Ü. Kebapçi, 2015 - (HYDROBIIDAE)
- kayseris, Stagnicola kayseris P. Glöer & M.Z. Yildirim, 2006 - (LYMNAEIDAE)
- kayserlingi, Ascoceras kayserlingi Barrande, 1865 † - (ASCOCERATIDAE) (FOSSIL)
- kaysi, Globonema kaysi Rohr & al., 1981 † - (TROCHONEMATIDAE) (FOSSIL)
- Kayutoceras, Genus Kayutoceras Ruzhentzev & Ganelin, 1971 † (ORULGANITIDAE) (FOSSIL)
- Kazachia, Genus Kazachia Bazhenova, 1971 † (CTENODONTIDAE) (FOSSIL)
- Kazachia, Genus Kazachia Bazhenova, 1971 † (NUCULIDA (unassigned)) (FOSSIL)
- kazakensis, Lymnaea kazakensis A. Mozley, 1934 - (LYMNAEIDAE)
- Kazakhoceras, Genus Kazakhoceras Ruzhencev , 1947 † (BERKHOCERATIDAE) (FOSSIL)
- Kazakhoclymenia, Genus Kazakhoclymenia Bogoslovskij, 1979 † (CLYMENIIDA (unassigned)) (FOSSIL)
- kazakhorum, Girtyoceras kazakhorum Ruzhentsev, 1966 † - (GIRTYOCERATIDAE) (FOSSIL)
- kazakhorum, Nothosporadoceras kazakhorum Bogoslovsky, 1971 † - (SPORADOCERATIDAE) (FOSSIL)
- kazakhstanense, Discoceras kazakhstanense I.S. Barskov † - (DISCOCERATIDAE) (FOSSIL)
- kazakhstanense, Triboloceras kazakhstanense Shimanskiy, 1967 † - (TRIGONOCERATIDAE) (FOSSIL)
- Kazakhstania, Genus Kazakhstania Librovitch , 1940 † (GATTENDORFIIDAE) (FOSSIL)
- kazakhstanica, Bagenovia kazakhstanica Koneva, 1976 † - (CAMBRIDIIDAE) (FOSSIL)
- kazakhstanica, Caspiohydrobia kazakhstanica Y.I. Starobogatov & S.I. Andreeva, 1981 - (HYDROBIIDAE)
- kazakhstanica, Aenigmomphiscola kazakhstanica N.D. Kruglov & Y.I. Starobogatov, 1981 - (LYMNAEIDAE)
- kazakhstanica, Artinskia kazakhstanica Ruzhentsev, 1951 † - (MEDLICOTTIIDAE) (FOSSIL)
- kazakhstanica, Uraloclymenia kazakhstanica Bogoslovsky, 1977 † - (PACHYCLYMENIIDAE) (FOSSIL)
- kazakhstanica, Pusillina kazakhstanica O.V. Amitrov, 2010 † - (RISSOIDAE) (FOSSIL)
- kazakhstanicum, Nuculoceras kazakhstanicum Ruzhentsev & Bogoslovskaya, 1971 † - (CRAVENOCERATIDAE) (FOSSIL)
- Kazakhstanites, Genus Kazakhstanites Shevyrev , 1968 † (SIBIRITIDAE) (FOSSIL)
- kazakovae, Panopea kazakovae M. Glibert & L. van de Poel, 1966 † - (HIATELLIDAE) (FOSSIL)
- kazakovi, Nordophiceras kazakovi Dagis & Ermakova, 1988 † - (MEEKOCERATIDAE) (FOSSIL)
- Kazancia, Genus Kazancia E. Neubert, 1992 (CLAUSILIIDAE)
- Kazanella, Genus Kazanella Mazaev, 2015 † (ORTHONEMATIDAE) (FOSSIL)
- kazanensis, Nucula kazanensis de Verneuil, 1845 † - syn of: Polidevcia kasanensis (de Verneuil, 1845 †) - (NUCULIDAE) (FOSSIL)
- kazanensis, Stuckenbergispira kazanensis Mazaev, 2015 † - (PLATYCERATIDAE) (FOSSIL)
- kazanensis, Pseudomonotis kazanensis (de Verneuil, 1845 †) - (PSEUDOMONOTIDAE) (FOSSIL)
- kazanensis, Avicula kazanensis de Verneuil, 1845 † - syn of: Pseudomonotis kazanensis (de Verneuil, 1845 †) - (PTERIIDAE) (FOSSIL)
- kazanensis, Palaeocosmomya kazanensis (H.B. Geinitz 1880 †) - (SANGUINOLITIDAE) (FOSSIL)
- kazani, Lucinoma kazani C. Salas & Woodside, 2002 - (LUCINIDAE)
- kazanicum, Paraliroceras kazanicum I.S. Barskov & Shilovsky, 2014 † - (LIROCERATIDAE) (FOSSIL)
- Kazanskyella, Genus Kazanskyella Stoyanow , 1949 † (PARAHOPLITIDAE) (FOSSIL)
- kazdaghensis, Bythinella kazdaghensis D.A. Odabasi & D.G. Georgiev, 2014 - (BYTHINELLIDAE)
- kazdailisi, Chryseofusus kazdailisi (K. Fraussen & R. Hadorn, 2000) - (FASCIOLARIIDAE)
- kazdailisi, Fusinus kazdailisi K. Fraussen & R. Hadorn, 2000 - syn of: Chryseofusus kazdailisi (K. Fraussen & R. Hadorn, 2000) - (FASCIOLARIIDAE)
- kazhdumiense, Knemiceras kazhdumiense M. Collignon, 1983 † - (KNEMICERATIDAE) (FOSSIL)
- kazmaliensis, Beyrichites kazmaliensis F. Toula, 1896 † - syn of: Nicomedites barbarossae F. Toula, 1896 † - (BEYRICHITIDAE) (FOSSIL)
- kaznakovi, Limax kaznakovi H.R. Simroth, 1912 - (LIMACIDAE)
- kaznakovi, Schileykula kaznakovi O.W. Von Rosen, 1914 - syn of: Schileykula batumensis (O. von Retowski, 1889) - (ORCULIDAE)
- kaznakovi, Parmacella kaznakovi H.R. Simroth, 1912 - syn of: Levanderiella levanderi (H.R. Simroth, 1901) - (PARMACELLIDAE)
- kaznakovi, Pupilla kaznakovi O.W. Von Rosen, 1914 - syn of: Schileykula batumensis (O. von Retowski, 1889) - (PUPILLIDAE)
- kaznakovi, Hyrcanolestes kaznakovi H.R. Simroth, 1912 - syn of: Hyrcanolestes velitaris (E.C. Von Martens, 1880) - (TRIGONOCHLAMYDIDAE)
- Kaznakoviella, Subgenus Cathaica (Kaznakoviella) W.A. Lindholm, 1922 (BRADYBAENIDAE)
- kazuensis, Oenopota kazuensis S. Nomura, 1940 - syn of: Oenopota kazusensis (S. Nomura, 1940) - (MANGELIIDAE)
- kazuensis, Gari kazuensis M. Yokoyama, 1922 - syn of: Gari californica (T.A. Conrad, 1849) - (PSAMMOBIIDAE)
- kazusense, Epitonium kazusense (M. Yokoyama, 1922) - (EPITONIIDAE)
- kazusensis, Oenopota kazusensis (S. Nomura, 1940) - (MANGELIIDAE)
- kazusensis, Gari kazusensis (M. Yokoyama, 1922) - (PSAMMOBIIDAE)
- kazusensis, Lora kazusensis S. Nomura, 1940 - syn of: Oenopota kazusensis (S. Nomura, 1940) - (TURRIDAE)
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