- Lyecoceras, Genus Lyecoceras Mutvei, 1957 † (PARAPHRAGMITIDAE) (FOSSIL)
- lyellanus, Lithodomus lyellanus C. Mayer in B. Hartung, 1864 - syn of: Lithophaga corrugata (R.A. Philippi, 1846) - (MYTILIDAE)
- lyelli, Acanthoceras lyelli d'Orbigny, 1841 † - syn of: Lyelliceras lyelli (A.V.M.D. D'Orbigny, 1841 †) - (ACANTHOCERATIDAE) (FOSSIL)
- lyelli, Acar lyelli (G.P. Deshayes, 1829 †) - (ARCIDAE) (FOSSIL)
- lyelli, Eubaculites lyelli (d'Orbigny, 1847 †) - (BACULITIDAE) (FOSSIL)
- lyelli, Bucania lyelli J.W. Hall 1847 † - (BUCANIIDAE) (FOSSIL)
- lyelli, Cephalaspis lyelli (A.E.R. Agassiz, 1835 †) - (CEPHALASPIDAE) (FOSSIL)
- lyelli, Conus lyelli J.R. Hendricks, 2015 † - (CONIDAE) (FOSSIL)
- lyelli, Conocardium lyelli (d'Archiac & de Verneuil, 1842 †) - (CONOCARDIIDAE) (FOSSIL)
- lyelli, Edmondia lyelli Hind † - (EDMONDIIDAE) (FOSSIL)
- lyelli, Retispira lyelli (C. Gemmellaro, 1889 †) - (KNIGHTITIDAE) (FOSSIL)
- lyelli, Eunema lyelli J. Perner, 1903 † - syn of: Globonema lyelli (J. Perner, 1903 †) - (LOPHOSPIRIDAE) (FOSSIL)
- lyelli, Lyelliceras lyelli (A.V.M.D. D'Orbigny, 1841 †) - (LYELLICERATIDAE) (FOSSIL)
- lyelli, Globonema lyelli (J. Perner, 1903 †) - (TROCHONEMATIDAE) (FOSSIL)
- lyelliana, Discula lyelliana R.T. Lowe, 1852 - (HYGROMIIDAE)
- lyelliana, Onustus lyelliana (J.A.H. Bosquet in C. Lyell, 1852 †) - (XENOPHORIDAE) (FOSSIL)
- lyellianus, Koninckites lyellianus (de Koninck, 1863 †) - (BEYRICHITIDAE) (FOSSIL)
- Lyelliceras, Genus Lyelliceras Spath , 1921 † (LYELLICERATIDAE) (FOSSIL)
- LYELLICERATIDAE Spath, 1921 † - Family (CEPHALOPODA-AMMONOIDEA-AMMONITIDA) (FOSSIL)
- lyellii, Onithochiton lyellii (G.B. I Sowerby in W.J. Broderip & G.B. I Sowerby, 1832) - (CHITONIDAE)
- lyellii, Spissatella lyellii (Sowerby, 1846 †) - (CRASSATELLIDAE) (FOSSIL)
- lygdina, Melatoma lygdina C. Hedley, 1922 - syn of: Splendrillia lygdina (C. Hedley, 1922) - (CLAVATULIDAE)
- lygdina, Splendrillia lygdina (C. Hedley, 1922) - (DRILLIIDAE)
- lygipleura, Diplommatina lygipleura J.J. Vermeulen, 1993 - (DIPLOMMATINIDAE)
- Lyhnidia, Genus Lyhnidia S. Hadžišce, 1956 (HYDROBIIDAE)
- lymani, Carelia lymani C.M. Cooke, 1931 - (AMASTRIDAE)
- lymani, Gemophos lymani Smith, 1936 - syn of: Solenosteira cancellaria (T.A. Conrad, 1846) - (BUCCINIDAE)
- lymani, Cerithium lymani H.A. Pilsbry, 1949 - syn of: Cerithium eburneum J.G. Bruguière, 1792 - (CERITHIIDAE)
- lymaniana, Achatinella mustelina lymaniana D.D. Baldwin, 1895 - (ACHATINELLIDAE)
- lymaniana, Orobophana uberta lymaniana H.A. Pilsbry & C.M. Cooke, 1908 - (HELICINIDAE)
- lymaniana, Negulus lymaniana C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- lymanniana, Hiona lymanniana (C.M.F. Ancey, 1893) - (EUCONULIDAE)
- lymense, Mantelliceras lymense Spath, 1926 † - (ACANTHOCERATIDAE) (FOSSIL)
- lymense, Oxynoticeras lymense (Wright, 1881 †) - (OXYNOTICERATIDAE) (FOSSIL)
- Lymnadia, syn of: Genus Potamilus C.S. Rafinesque, 1819 (UNIONIDAE)
- Lymnaea, Genus Lymnaea J.B.P.A. Lamarck, 1801 (LYMNAEIDAE)
- lymnaeformis, Pomacea lymnaeformis L.A. Reeve, 1856 - syn of: Pomacea aulanieri (L. Deville & L.H. Hupé, 1850) - (AMPULLARIIDAE)
- lymnaeformis, Vulsella lymnaeformis L.A. Reeve, 1858 - syn of: Vulsella ovata J.B.P.A. Lamarck, 1819 - (PTERIIDAE)
- lymnaeformis, Daphnella lymnaeformis L.C. Kiener, 1840 - syn of: Daphnella lymneiformis W.P. Woodring, 1928 - (RAPHITOMIDAE)
- LYMNAEIDAE Rafinesque, 1815 - Family (GASTROPODA-HETEROBRANCHIA-PULMONATA-HYGROPHILA)
- lymnaeoides, Tricolia lymnaeoides H.E. Anton, 1839 - syn of: Tricolia speciosa (J.K. Megerle Von Mühlfeld, 1824) - (PHASIANELLIDAE)
- Lymnaeus, syn of: Genus Lymnaea J.B.P.A. Lamarck, 1801 (LYMNAEIDAE)
- Lymnea, syn of: Genus Lymnaea J.B.P.A. Lamarck, 1801 (LYMNAEIDAE)
- lymneiformis, Pomacea lymneiformis L.A. Reeve, 1856 - syn of: Pomacea aulanieri (L. Deville & L.H. Hupé, 1850) - (AMPULLARIIDAE)
- lymneiformis, Daphnella lymneiformis W.P. Woodring, 1928 - (RAPHITOMIDAE)
- lymneiformis, Pleurotoma lymneiformis L.C. Kiener, 1840 - syn of: Daphnella lymneiformis W.P. Woodring, 1928 - (TURRIDAE)
- lymneiformis botanica, Daphnella lymneiformis botanica C. Hedley, 1918 - syn of: Daphnella botanica C. Hedley, 1918 - (RAPHITOMIDAE)
- lymneoides, Monoptygma lymneoides (T.A. Conrad, 1833 †) - (NASSARIIDAE) (FOSSIL)
- Lymnium, syn of: Genus Unio L. Philipsson, 1788 (UNIONIDAE)
- LYMNOCARDIIDAE - syn of Family: CARDIIDAE
- Lymnopsis, syn of: Genus Limopsis A. Sasso, 1827 (LIMOPSIDAE)
- lynceus, Graphiconus lynceus (G.B. II Sowerby, 1858) - (CONIDAE)
- lynceus, Graphiconus lynceus G.B. II Sowerby, 1858 - syn of: Graphiconus lynceus (G.B. II Sowerby, 1858) - (CONIDAE)
- lynceus, Phidiana lynceus L.S.R. Bergh, 1867 - (FACELINIDAE)
- lynceus, Cyclolituites lynceus Holm † - (LITUITIDAE) (FOSSIL)
- lynceus phuketensis, Graphiconus lynceus phuketensis A.J. Da Motta, 1978 - syn of: Graphiconus pretiosus (G. Nevill & H. Nevill, 1874) - (CONIDAE)
- lynchae, Scintilla lynchae P.G. Oliver & A.M. Holmes, 2004 - (GALEOMMATIDAE)
- lynchi, Drymaeus lynchi J.J. Parodíz, 1946 - (BULIMULIDAE)
- lynchi, Latirus lynchi (B. de Basterot, 1825 †) - (FASCIOLARIIDAE) (FOSSIL)
- lynchi densestriata, Latirus lynchi densestriata (L.M.D. Bellardi, 1884) - (FASCIOLARIIDAE)
- lyncicrosa, Cypraea tigris lyncicrosa W.R. Steadman & B.C. Cotton, 1943 - (CYPRAEIDAE)
- lynciculus, Plekocheilus lynciculus L. Deville & L.H. Hupé, 1850 - (AMPHIBULIMIDAE)
- Lyncina, Genus Lyncina F.H. Troschel, 1863 (CYPRAEIDAE)
- lyncoides, Basterotia lyncoides A. Brongniart, 1823 † - syn of: Trona lyncoides (A. Brongniart, 1823 †) - (BASTEROTIIDAE) (FOSSIL)
- lyncoides, Trona lyncoides (A. Brongniart, 1823 †) - (CYPRAEIDAE) (FOSSIL)
- lyncoides, Cypraea lyncoides J.P.S. Grateloup, 1845 † - syn of: Jousseaumea sublyncoides (A.V.M.D. D'Orbigny, 1852 †) - (CYPRAEIDAE) (FOSSIL)
- lyndi, Helix lyndi G.F. Angas, 1872 - syn of: Xanthomelon spheroidea (E.J. Le Guillou, 1845) - (HELICIDAE)
- lyndonensis, Mourlonia lyndonensis Dickins, 1957 † - (GOSSELETINIDAE) (FOSSIL)
- lyngei, Liralucina lyngei M. Huber, 2015 - (LUCINIDAE)
- lyngei, Quirella lyngei E. Robba, S.I. Di Geronimo, N. Chaimanee & al., 2004 - (PYRAMIDELLIDAE)
- lynnae, Krylovina lynnae P.H. Valentich-Scott & E.V. Coan, 2012 - (CUSPIDARIIDAE)
- lynnae, Adontorhina lynnae P.H. Valentich-Scott, 2000 - (THYASIRIDAE)
- lynneii, Neoprososthenia lynneii (D.H.S. Davis, 1971) - (POMATIOPSIDAE)
- lynnensis, Cyclolituites lynnensis (Kjerulf, 1865 †) - (LITUITIDAE) (FOSSIL)
- Lyntoxia, syn of: Genus Fusconaia C.T. Simpson, 1900 (UNIONIDAE)
- lynx, Lyncina lynx (C. Linnaeus, 1758) - (CYPRAEIDAE)
- lynx, Cypraea lynx C. Linnaeus, 1758 - syn of: Lyncina lynx (C. Linnaeus, 1758) - (CYPRAEIDAE)
- lynx caledonica, Lyncina lynx caledonica J.C.H. Crosse, 1869 - (CYPRAEIDAE)
- lynx nigrolineata, Lyncina lynx nigrolineata L. Bozzetti, 2014 - (CYPRAEIDAE)
- lynx vanelli, Lyncina lynx vanelli (C. Linnaeus, 1758) - (CYPRAEIDAE)
- lynx williamsi, Lyncina lynx williamsi (J.C. Melvill, 1888) - (CYPRAEIDAE)
- Lyobasis, Subgenus Obeliscus (Lyobasis) H.A. Pilsbry, 1903 (SUBULINIDAE)
- LYOCYCLIDAE Thiele, 1925 - Family (GASTROPODA-CAENOGASTROPODA)
- Lyocyclus, Genus Lyocyclus K.H.J. Thiele, 1925 (LYOCYCLIDAE)
- lyoensis, Pinguiphaedusa lyoensis (H. Minato & A. Tada, 1977) - (CLAUSILIIDAE)
- Lyogyrus, Genus Lyogyrus T.N. Gill, 1863 (AMNICOLIDAE)
- lyonensis, Discosorus lyonensis Foerste, 1936 † - syn of: Endodiscosorus lyonensis (Foerste, 1936 †) - (DISCOSORIDAE) (FOSSIL)
- lyonensis, Endodiscosorus lyonensis (Foerste, 1936 †) - (LOWOCERATIDAE) (FOSSIL)
- lyonetiana, Cochlorina lyonetiana H.C. Küster, 1840 - (BULIMULIDAE)
- lyonetianus, Gibbus lyonetianus (P.S. Pallas, 1774) - (STREPTAXIDAE)
- lyoni, Cardiola lyoni J.W. Hall, 1860 † - (CARDIOLIDAE) (FOSSIL)
- lyoni, Corbula lyoni H.A. Pilsbry, 1897 - syn of: Corbula pulchella R.A. Philippi, 1893 - (CORBULIDAE)
- lyoni, Prolecanites lyoni (F.B. Meek & A.H. Worthen, 1860 †) - (PROLECANITIDAE) (FOSSIL)
- lyonii, Amusium lyonii W.M. Gabb, 1873 † - (PECTINIDAE) (FOSSIL)
- lyonii, Unio lyonii I. Lea, 1865 - syn of: Fusconaia barnesiana (I. Lea, 1829) - (UNIONIDAE)
- lyonnetianum, Craspedopoma lyonnetianum R.T. Lowe, 1852 - (CRASPEDOPOMATIDAE)
- lyonsensis, Deltopecten lyonsensis Dickins, 1957 † - (DELTOPECTINIDAE) (FOSSIL)
- lyonsensis, Polidevcia lyonsensis Dickins, 1956 † - (NUCULANIDAE) (FOSSIL)
- lyonsi, Busycon lyonsi E.J. Petuch, 1987 - (BUSYCONIDAE)
- lyonsi, Pleuroploca lyonsi L. Bozzetti, 2008 - (FASCIOLARIIDAE)
- lyonsi, Fletcheripecten lyonsi C.O. Waterhouse, 1986 † - (HETEROPECTINIDAE) (FOSSIL)
- lyonsi, Muricopsis lyonsi E.J. Petuch, 1986 - syn of: Murexsul oxytatus (M. Smith, 1938) - (MURICIDAE)
- lyonsi, Daphnella lyonsi J. Espinosa & R. Fernández-Garcés, 1990 - (RAPHITOMIDAE)
- lyonsi, Turritella lyonsi E.F. Garcia, 2006 - (TURRITELLIDAE)
- Lyonsia, Genus Lyonsia W.H. Turton, 1822 (LYONSIIDAE)
- lyonsiana, Bulimella fuscobasis lyonsiana D.D. Baldwin, 1895 - (ACHATINELLIDAE)
- lyonsiana, Pupa lyonsiana C.M.F. Ancey - syn of: Gastrocopta lyonsiana (C.M.F. Ancey) - (ACTEONIDAE)
- lyonsiana, Gastrocopta lyonsiana (C.M.F. Ancey) - (VERTIGINIDAE)
- Lyonsiela, syn of: Genus Lyonsiella G.O. Sars, 1872 (LYONSIELLIDAE)
- Lyonsiella, Genus Lyonsiella G.O. Sars, 1872 (LYONSIELLIDAE)
- LYONSIELLIDAE Dall, 1895 - Family (BIVALVIA-HETERODONTA-EUHETERODONTA-ANOMALODESMATA)
- lyonsii, Calliostoma lyonsii W.E. Leach, 1847 - syn of: Calliostoma zizyphinum conuloides lyonsii W.E. Leach, 1850 - (CALLIOSTOMATIDAE)
- lyonsii, Trochus lyonsii W.E. Leach, 1852 - syn of: Calliostoma zizyphinum (C. Linnaeus, 1758) - (TROCHIDAE)
- LYONSIIDAE P. Fischer, 1887 - Family (BIVALVIA-HETERODONTA-EUHETERODONTA-ANOMALODESMATA)
- lyopleura, Crassispira lyopleura McNeil, 1984 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- Lyosoma, Genus Lyosoma Sohl, 1965 † (PLEUROCERIIDAE) (FOSSIL)
- Lyozymia, syn of: Genus Liocyma W.H. Dall, 1870 (VENERIDAE)
- lyperium, Buccinum lyperium W.H. Dall, 1919 - (BUCCINIDAE)
- lypra, Phaedusa lypra (J.F. Mabille, 1887) - (CLAUSILIIDAE)
- lypra duanensis, Phaedusa lypra duanensis H. Nordsieck, 2012 - (CLAUSILIIDAE)
- lypra latestriata, Phaedusa lypra latestriata H. Nordsieck, 2007 - (CLAUSILIIDAE)
- lyra, Carinorbis lyra (T.A. Conrad, 1834) - (AMATHINIDAE)
- lyra, Anatoma lyra (S.S. Berry, 1947) - (ANATOMIDAE)
- lyra, Bellerophon lyra J.W. Hall, 1859 † - syn of: Phragmosphaera lyra (J.W. Hall, 1859 †) - (BELLEROPHONTIDAE) (FOSSIL)
- lyra, Genota lyra (G.P. Deshayes †) - (BORSONIIDAE) (FOSSIL)
- lyra, Isiola lyra Kríž, 1976 † - (CARDIOLIDAE) (FOSSIL)
- lyra, Scobinella lyra (G.P. Deshayes, 1834 † †) - (CLATHURELLIDAE) (FOSSIL)
- lyra, Synprosphyma lyra (P.V. Gredler, 1887) - (CLAUSILIIDAE)
- lyra, Corbula lyra C.J. Maury, 1930 † - (CORBULIDAE) (FOSSIL)
- lyra, Syntomodrillia lyra P.J. Fallon, 2016 - (DRILLIIDAE)
- lyra, Epitonium lyra (G.B. II Sowerby, 1844) - (EPITONIIDAE)
- lyra, Scala lyra M. Yokoyama, 1927 - syn of: Epitonium yokoyamai M. Suzuki & M. Ichikawa, 1936 - (EPITONIIDAE)
- lyra, Epitonium lyra F.W. Hutton, 1873 - syn of: Epitonium tenellum (F.W. Hutton, 1885) - (EPITONIIDAE)
- lyra, Eastonia lyra J.C. Melvill, 1898 † - syn of: Eastonia solanderi (J.E. Gray, 1837 †) - (MACTRIDAE) (FOSSIL)
- lyra, Eucithara lyra (L.A. Reeve, 1846) - (MANGELIIDAE)
- lyra, Phragmosphaera lyra (J.W. Hall, 1859 †) - (PTEROTHECIDAE) (FOSSIL)
- lyra, Scissurella lyra S.S. Berry, 1947 - syn of: Anatoma lyra (S.S. Berry, 1947) - (SCISSURELLIDAE)
- lyra, Tellina lyra (S.C.T. Hanley, 1844) - (TELLINIDAE)
- lyra, Eurytellina lyra S.C.T. Hanley, 1844 - syn of: Tellina lyra (S.C.T. Hanley, 1844) - (TELLINIDAE)
- lyra, Venus lyra S.C.T. Hanley, 1845 - (VENERIDAE)
- lyra, Petricola lyra J.C. Melvill, 1898 † - syn of: Eastonia solanderi (J.E. Gray, 1837 †) - (VENERIDAE) (FOSSIL)
- lyra, Athleta lyra (J.B.P.A. Lamarck, 1802 †) - (VOLUTIDAE) (FOSSIL)
- lyraecostatus, Phos lyraecostatus J.E. Tenison-Woods, 1876 † - (NASSARIIDAE) (FOSSIL)
- lyraeformis, Mitra lyraeformis W.J. Swainson, 1821 - syn of: Lyria lyraeformis (W.J. Swainson, 1821) - (MITRIDAE)
- lyraeformis, Nassa lyraeformis F.P. Marrat, 1880 - syn of: Nassarius livescens (R.A. Philippi, 1849) - (NASSARIIDAE)
- lyraeformis, Lyria lyraeformis (W.J. Swainson, 1821) - (VOLUTIDAE)
- LyraGriffith, syn of: Genus Harpa P.F. Röding, 1798 (HARPIDAE)
- lyrapintoae, Macromphalina lyrapintoae J.C.N. Barros, 1994 - (VANIKORIDAE)
- lyrata, Pupa lyrata A.A. Gould, 1843 - syn of: Lyropupa lyrata (A.A. Gould, 1843) - (ACTEONIDAE)
- lyrata, Udosarx lyrata G.R. Webb, 1959 - (ARIOLIMACIDAE)
- lyrata, Belomitra lyrata É.A.A. Locard, 1897 - syn of: Belomitra quadruplex lyrata É.A.A. Locard, 1897 - (BELOMITRIDAE)
- lyrata, Belomitra quadruplex lyrata É.A.A. Locard, 1897 - (BELOMITRIDAE)
- lyrata, Neptunea lyrata (J.F. Gmelin, 1791) - (BUCCINIDAE)
- lyrata, Sveltia lyrata (G.B. Brocchi, 1814) - (CANCELLARIIDAE)
- lyrata, Cancellaria lyrata A. Adams & L.A. Reeve, 1850 - (CANCELLARIIDAE)
- lyrata, Granata lyrata (H.A. Pilsbry, 1890) - (CHILODONTIDAE)
- lyrata, Anachis lyrata (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- lyrata, Columbella lyrata G.B. I Sowerby, 1832 - syn of: Anachis lyrata (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- lyrata, Indocorbula lyrata (Sowerby, 1840 †) - (CORBULIDAE) (FOSSIL)
- lyrata, Natiria lyrata (B. Phillips, 1836 †) - (CRASPEDOSTOMATIDAE) (FOSSIL)
- lyrata, Diplommatina lyrata A.A. Gould, 1859 - (DIPLOMMATINIDAE)
- lyrata, Stephadiscus lyrata (A.A. Gould, 1846) - (ENDODONTIDAE)
- lyrata, Oenopota lyrata É.A.A. Locard, 1897 - syn of: Belomitra quadruplex lyrata É.A.A. Locard, 1897 - (MANGELIIDAE)
- lyrata, Melanopsis lyrata M. von Neumayr, 1869 † - (MELANOPSIDAE) (FOSSIL)
- lyrata, Mitra lyrata J.B.P.A. Lamarck, 1822 - syn of: Vexillum lyratum (J.B.P.A. Lamarck, 1822) - (MITRIDAE)
- lyrata, Nassaria lyrata J.H.F. Link, 1807 - syn of: Nassaria pusilla (P.F. Röding, 1798) - (NASSARIIDAE)
- lyrata, Cyllene lyrata J.B.P.A. Lamarck, 1822 - syn of: Cyllene lamarcki W.O. Cernohorsky, 1975 - (NASSARIIDAE)
- lyrata, Nuculana lyrata R.B. Hinds, 1843 - syn of: Saccella eburnea (G.B. I Sowerby, 1833) - (NUCULANIDAE)
- lyrata, Nucula lyrata R.B. Hinds, 1843 - syn of: Saccella eburnea (G.B. I Sowerby, 1833) - (NUCULIDAE)
- lyrata, Tomichia lyrata M. Connolly, 1939 - (POMATIOPSIDAE)
- lyrata, Rectoclymenia lyrata Nikolaeva & Ivanovich, 2005 † - (RECTOCLYMENIIDAE) (FOSSIL)
- lyrata, Rissoina lyrata A.A. Gould, 1861 - (RISSOINIDAE)
- lyrata, Glessula lyrata W.T. Blanford - (SUBULINIDAE)
- lyrata, Novisuccinea lyrata (A.A. Gould, 1859) - (SUCCINEIDAE)
- lyrata, Pseudostomatella lyrata H.A. Pilsbry, 1890 - syn of: Granata lyrata (H.A. Pilsbry, 1890) - (TROCHIDAE)
- lyrata, Trochonema lyrata (McCoy) † - (TROCHONEMATIDAE) (FOSSIL)
- lyrata, Meretrix lyrata (G.B. II Sowerby, 1851) - (VENERIDAE)
- lyrata, Lyropupa lyrata (A.A. Gould, 1843) - (VERTIGINIDAE)
- lyrata, Voluta lyrata G.B. Brocchi, 1814 - syn of: Sveltia lyrata (G.B. Brocchi, 1814) - (VOLUTIDAE)
- lyrata, Harpeola lyrata G.B. I Sowerby, 1825 - syn of: Lyria anna (R.P. Lesson, 1835) - (VOLUTIDAE)
- lyrata decemcostata, Neptunea lyrata decemcostata (T. Say, 1826) - syn of: Neptunea decemcostata (T. Say, 1826) - (BUCCINIDAE)
- lyrata fossilis, Lyropupa lyrata fossilis C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- lyrata gouldi, Lyropupa lyrata gouldi H.A. Pilsbry & C.M. Cooke, 1920 - (VERTIGINIDAE)
- lyrata koreana, Novisuccinea lyrata koreana (H.A. Pilsbry, 1927) - (SUCCINEIDAE)
- lyrata obralete, Neptunea lyrata obralete A.N. Golikov, 1962 - (BUCCINIDAE)
- lyrata phoenicea, Neptunea lyrata phoenicea W.H. Dall, 1907 - syn of: Neptunea ithia (W.H. Dall, 1891) - (BUCCINIDAE)
- lyrata polycostata, Neptunea lyrata polycostata O.A. Scarlato, 1955 - syn of: Neptunea polycostata Y.I. Galkin & O.A. Scarlato, 1955 - (BUCCINIDAE)
- lyrata russelli, Udosarx lyrata russelli G.R. Webb, 1980 - (ARIOLIMACIDAE)
- lyrata tokunoshimana, Diplommatina lyrata tokunoshimana H.A. Pilsbry & Y. Hirase, 1904 - (DIPLOMMATINIDAE)
- lyrata turnerae, Neptunea lyrata turnerae A.H. Clarke, 1956 - (BUCCINIDAE)
- lyrata uncifera, Lyropupa lyrata uncifera C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- lyrata veleda, Anachis lyrata veleda (P.L. Duclos, 1846) - (COLUMBELLIDAE)
- Lyrata-group, syn of: Genus Neptunea P.F. Röding, 1798 (BUCCINIDAE)
- Lyratellina, syn of: Subgenus Arcopagia (Merisca) W.H. Dall, 1900 (TELLINIDAE)
- lyratodespecta, Neptunea striata lyratodespecta F. Strauch, 1972 - (BUCCINIDAE)
- Lyratoherpia, Genus Lyratoherpia L. Salvini-Plawén, 1978 (DONDERSIIDAE)
- lyratum, Buccinum lyratum J.F. Gmelin, 1791 - syn of: Boreotrophon clathratus (C. Linnaeus, 1767) - (BUCCINIDAE)
- lyratum, Buccinum lyratum J.B.P.A. Lamarck, 1822 - syn of: Cyllene lamarcki W.O. Cernohorsky, 1975 - (BUCCINIDAE)
- lyratum, Lyrocardium lyratum (G.B. II Sowerby, 1840) - (CARDIIDAE)
- lyratum, Vexillum lyratum (J.B.P.A. Lamarck, 1822) - (COSTELLARIIDAE)
- lyratum, Zospeum lyratum C. Pollonera, 1905 - syn of: Zospeum spelaeum (E.A. Rossmässler, 1839) - (ELLOBIIDAE)
- lyratum, Cirsotrema lyratum (C.A. von Zittel, 1864 †) - (EPITONIIDAE) (FOSSIL)
- lyratum, Gyronema lyratum Ulrich & Scofield, 1897 † - (LOPHOSPIRIDAE) (FOSSIL)
- lyratus, Chiton lyratus G.B. II Sowerby, 1840 - (CHITONIDAE)
- lyratus, Conilithes lyratus (P. Marshall, 1918 †) - (CONIDAE) (FOSSIL)
- lyratus, Latirus lyratus W.H. Pease, 1868 - syn of: Peristernia lirata (W.H. Pease, 1868) - (FASCIOLARIIDAE)
- lyratus, Xymenopsis lyratus (J.P.Y. Couthouy & A.A. Gould, 1849) - (MURICIDAE)
- lyratus, Hexaplex angularis lyratus (C.B. Adams, 1853) - (MURICIDAE)
- lyratus, Eoradiolites lyratus T.A. Conrad, 1852 † - syn of: Eoradiolites liratus (T.A. Conrad, 1852 †) - (RADIOLITIDAE) (FOSSIL)
- Lyrcaea, syn of: Genus Melanopsis A.E.J. Férussac, 1807 (MELANOPSIDAE)
- Lyrcaea, syn of: Genus Melanopsis A.E.J. Férussac, 1807 (MELANOPSIDAE)
- Lyreneta, syn of: Genus Lyria J.E. Gray, 1847 (VOLUTIDAE)
- Lyria, Genus Lyria J.E. Gray, 1847 (VOLUTIDAE)
- Lyrianella, Genus Lyrianella Nelson, 1925 † (NEOGASTROPODA (unassigned)) (FOSSIL)
- lyrica, Paraglauconia lyrica C.J. Maury, 1936 † - (EULIMIDAE) (FOSSIL)
- lyrica, Gingicithara lyrica (L.A. Reeve, 1846) - (MANGELIIDAE)
- lyrica, Cythara lyrica L.A. Reeve, 1846 - syn of: Gingicithara lyrica (L.A. Reeve, 1846) - (MANGELIIDAE)
- lyrica, Mangelia lyrica L.A. Reeve, 1846 - syn of: Gingicithara lyrica (L.A. Reeve, 1846) - (MANGELIIDAE)
- lyrica, Eucithara lyrica L.A. Reeve, 1846 - syn of: Gingicithara lyrica (L.A. Reeve, 1846) - (MANGELIIDAE)
- lyrica, Daphnella lyrica L.A. Reeve, 1846 - syn of: Gingicithara lyrica (L.A. Reeve, 1846) - (RAPHITOMIDAE)
- lyrica, Tellina lyrica (H.A. Pilsbry & H.N. Lowe, 1932) - (TELLINIDAE)
- lyrica, Eurytellina lyrica H.A. Pilsbry & H.N. Lowe, 1932 - syn of: Tellina lyrica (H.A. Pilsbry & H.N. Lowe, 1932) - (TELLINIDAE)
- Lyridon, syn of: Genus Trigonia Bruguière, 1789 † (TRIGONIIDAE) (FOSSIL)
- lyriformis, Mitra lyriformis W. Wood, 1828 † - syn of: Mitraelyria mitraeformis (J.B.P.A. Lamarck, 1811 †) - (MITRIDAE) (FOSSIL)
- lyriformis, Thiara scabra lyriformis I. Lea, 1850 - (THIARIDAE)
- Lyrioceras, Genus Lyrioceras Foerste, 1927 † (NEPHRITICERATIDAE) (FOSSIL)
- Lyriochlamys, Genus Lyriochlamys Sobetski, 1977 † (PECTINIDAE) (FOSSIL)
- Lyriodon, syn of: Genus Trigonia Bruguière, 1789 † (TRIGONIIDAE) (FOSSIL)
- Lyriomyophoria, syn of: Genus Elegantinia Waagen, 1907 † (MYOPHORIIDAE) (FOSSIL)
- Lyriopecten, Genus Lyriopecten Hall, 1877 † (PTERINOPECTINIDAE) (FOSSIL)
- Lyriopsis, Genus Lyriopsis Merle et al., 2014 † (VOLUTIDAE) (FOSSIL)
- Lyrioschizodus, syn of: Genus Lyroschizodus Newell & Boyd, 1975 † (SCHIZODIDAE) (FOSSIL)
- Lyriostoma, syn of: Genus Labyrinthus H.H. Beck, 1837 (CAMAENIDAE)
- Lyrischapa, Genus Lyrischapa Aldrich, 1911 † (VOLUTIDAE) (FOSSIL)
- Lyrocardium, Genus Lyrocardium F.B. Meek, 1876 (CARDIIDAE)
- Lyroconus, Subgenus Thysanophora (Lyroconus) F.C. Baker, 1927 (THYSANOPHORIDAE)
- Lyrocystis, Subgenus Trachycystis (Lyrocystis) H. Watson, 1934 (CHAROPIDAE)
- Lyrodes, Genus Lyrodes A. Doering, 1884 (COCHLIOPIDAE)
- Lyrodesma, Genus Lyrodesma Conrad, 1841 † (LYRODESMATIDAE) (FOSSIL)
- LYRODESMATIDAE P. Fischer, 1886 † - Family (BIVALVIA-PALAEOHETERODONTA) (FOSSIL)
- Lyrodiscus, Subgenus Retinella (Lyrodiscus) H.A. Pilsbry, 1893 (ZONITIDAE)
- Lyrodobankia, syn of: Genus Bankia J.E. Gray, 1842 (TEREDINIDAE)
- Lyrodon, syn of: Genus Trigonia Bruguière, 1789 † (TRIGONIIDAE) (FOSSIL)
- Lyrodus, Genus Lyrodus W.G. Binney, 1870 (TEREDINIDAE)
- Lyrofusus, Genus Lyrofusus de Gregorio, 1880 † (BUCCINIDAE) (FOSSIL)
- Lyrogoniatites, Genus Lyrogoniatites Miller & Furnish, 1940 † (NEOGLYPHIOCERATIDAE) (FOSSIL)
- Lyromangelia, syn of: Genus Mangelia A. Risso, 1826 (MANGELIIDAE)
- lyromma, Bathothauma lyromma C. Chun, 1906 - (CRANCHIIDAE)
- lyronuclea, Theta lyronuclea (A.H. Clarke, 1959) - (RAPHITOMIDAE)
- Lyronucula, Genus Lyronucula Fischer, 1886 † (LYRODESMATIDAE) (FOSSIL)
- Lyropecten, Genus Lyropecten T.A. Conrad, 1862 (PECTINIDAE)
- Lyropupa, Genus Lyropupa H.A. Pilsbry, 1900 (VERTIGINIDAE)
- Lyropupilla, Subgenus Lyropupa (Lyropupilla) H.A. Pilsbry & C.M. Cooke, 1920 (VERTIGINIDAE)
- Lyropurpura, Genus Lyropurpura F.P. Jousseaume, 1880 (MURICIDAE)
- Lyroschizodus, Genus Lyroschizodus Newell & Boyd, 1975 † (SCHIZODIDAE) (FOSSIL)
- Lyroseila, syn of: Genus Seila A. Adams, 1861 (CERITHIOPSIDAE)
- Lyrostoma, syn of: Genus Labyrinthus H.H. Beck, 1837 (CAMAENIDAE)
- Lyrosurcula, Genus Lyrosurcula Casey, 1904 † (TURRIDAE) (FOSSIL)
- Lyrotyphis, Genus Lyrotyphis Jousseaume, 1880 † (MURICIDAE) (FOSSIL)
- lyrta, Decipifus lyrta (F.C. Baker, G.D. Hanna & A.M. Strong, 1938) - (COLUMBELLIDAE)
- Lyrula, Subgenus Monilearia (Lyrula) T.V. Wollaston, 1878 (COCHLICELLIDAE)
- lyrula, Ripkeniella lyrula (T.V. Wollaston, 1878) - (COCHLICELLIDAE)
- Lysacme, Subgenus Syrnola (Lysacme) W.H. Dall & P. Bartsch, 1904 (PYRAMIDELLIDAE)
- Lysagoraceras, syn of: Genus Lysagoroceras Schönenberg, 1952 † (POTERIOCERATIDAE) (FOSSIL)
- Lysagoroceras, Genus Lysagoroceras Schönenberg, 1952 † (POTERIOCERATIDAE) (FOSSIL)
- lysander, Cyrtoceras lysander Billings, 1865 † - syn of: Manitoulinoceras lysander (Billings, 1865 †) - (ONCOCERIDA (unassigned)) (FOSSIL)
- lysander, Manitoulinoceras lysander (Billings, 1865 †) - (VALCOUROCERATIDAE) (FOSSIL)
- lysidia, Columbella lysidia P.L. Duclos, 1850 - syn of: Monilispira lysidia (P.L. Duclos, 1850) - (COLUMBELLIDAE)
- lysidia, Monilispira lysidia (P.L. Duclos, 1850) - (PSEUDOMELATOMIDAE)
- Lysinoe, Genus Lysinoe H. Adams & A. Adams, 1855 (XANTHONYCHIDAE)
- Lysiogyrus, Genus Lysiogyrus Youluo, 1978 † (HYDROBIIDAE) (FOSSIL)
- lysiosquillina, Phlyctaenachlamys lysiosquillina J.D. Popham, 1939 - (GALEOMMATIDAE)
- Lysis, Genus Lysis Gabb, 1864 † (EULIMIDAE) (FOSSIL)
- lysis, Trypatrochus lysis P. Lozouet, 2012 † - (TRYPANAXIDAE) (FOSSIL)
- lysiska, Columbella lysiska P.L. Duclos, 1846 - syn of: Euplica varians (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- lysistoma, Helix lysistoma W. Kobelt, 1876 - syn of: Chilostoma sphaeriostoma J.R. Bourguignat, 1857 - (HELICIDAE)
- lyteostoma, Dautzenbergiella duella lyteostoma (O.F. von Möllendorff, 1901) - (CLAUSILIIDAE)
- lythense, Pseudolioceras lythense A.T. Young & Bird, 1828 † - (HILDOCERATIDAE) (FOSSIL)
- Lytheoceras, Genus Lytheoceras Ruzhentsev & Bogoslovskaya, 1971 † (NEOGLYPHIOCERATIDAE) (FOSSIL)
- Lythoglyphus, syn of: Genus Lithoglyphus J.D.W. Hartmann, 1821 (LITHOGLYPHIDAE)
- lythophagus, Mytilus lythophagus C.U.A. von Salis-Marschlins, 1793 - syn of: Lithophaga lithophaga (C. Linnaeus, 1758) - (MYTILIDAE)
- Lyticoceras, Genus Lyticoceras Hyatt , 1900 † (NEOCOMITIDAE) (FOSSIL)
- Lytoceras, Genus Lytoceras Monestier, 1921 † (LYTOCERATIDAE) (FOSSIL)
- LYTOCERATIDAE Neumayr, 1875 † - Family (CEPHALOPODA-AMMONOIDEA-AMMONITIDA) (FOSSIL)
- lytoceratoides, Eschericeratites lytoceratoides Guex & al., 2005 † - (TIROLITIDAE) (FOSSIL)
- lytoceroides, Puzosia lytoceroides F. Haas, 1952 † - (DESMOCERATIDAE) (FOSSIL)
- Lytoconites, Genus Lytoconites Wiedmann , 1970 † (LYTOCERATIDAE) (FOSSIL)
- Lytocrioceras, Genus Lytocrioceras Spath, 1924 † (AMMONOIDEA (unassigned)) (FOSSIL)
- Lytodiscoides, Genus Lytodiscoides Spath, 1922 † (DESMOCERATIDAE) (FOSSIL)
- Lytogyroceras, Genus Lytogyroceras Spath, 1925 † (ASPIDOCERATIDAE) (FOSSIL)
- Lytohamites, Genus Lytohamites Casey , 1961 † (HAMITIDAE) (FOSSIL)
- Lytohoplites, Genus Lytohoplites Imlay, 1942 † (NEOCOMITIDAE) (FOSSIL)
- Lytopelte, Genus Lytopelte O. Böttger, 1886 (LIMACIDAE)
- Lytophiceras, Genus Lytophiceras Spath , 1930 † (OPHICERATIDAE) (FOSSIL)
- Lytospira, Genus Lytospira Koken, 1896 † (OPHILETIDAE) (FOSSIL)
- lytostomopsis, Radix lytostomopsis (Š. Brusina, 1902 †) - (LYMNAEIDAE) (FOSSIL)
- Lytotropites, Genus Lytotropites Spath , 1924 † (LYTOCERATIDAE) (FOSSIL)
- lytteltonensis, Incisura lytteltonensis (E.A. Smith, 1894) - (SCISSURELLIDAE)
- lyttleltonensis, Incisura lyttleltonensis E.A. Smith, 1894 - syn of: Incisura lytteltonensis (E.A. Smith, 1894) - (SCISSURELLIDAE)
- lyttletonensis, Incisura lyttletonensis E.A. Smith, 1894 - syn of: Incisura lytteltonensis (E.A. Smith, 1894) - (SCISSURELLIDAE)
- lyuhrurngae, Glyphostoma lyuhrurngae K.Y. Lai, 2005 - (CLATHURELLIDAE)
- Lywea, Subgenus Weyla (Lywea) Damborenea, 1987 † (NEITHEIDAE) (FOSSIL)
- lyzarzaburui, Happia lyzarzaburui (F.P. Jousseaume, 1887) - (SCOLODONTIDAE)
- lyzarzaburui, Ammonoceras lyzarzaburui F.P. Jousseaume, 1887 - syn of: Happia lyzarzaburui (F.P. Jousseaume, 1887) - (SCOLODONTIDAE)
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