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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (511)
- Superfamily Eoacmaeoidea T. Nakano & Ozawa, 2007 accepted as Lottioidea Gray, 1840
- Superfamily Lottioidea Gray, 1840 (334)
- Family Acmaeidae Forbes, 1850 (22)
- Genus Acmaea Eschscholtz, 1833 (12)
- Subgenus Acmaea (Chiazacmea) W. R. B. Oliver, 1926 accepted as Patelloida Quoy & Gaimard, 1834
- Subgenus Acmaea (Collisella) Dall, 1871 accepted as Lottia J. E. Gray, 1833
- Subgenus Acmaea (Niveotectura) T. Habe, 1944 accepted as Niveotectura T. Habe, 1944
- Subgenus Acmaea (Notoacmea) Iredale, 1915 accepted as Notoacmea Iredale, 1915
- Subgenus Acmaea (Rhodopetala) Dall, 1921 accepted as Rhodopetala Dall, 1921
- Subgenus Acmaea (Tectura) J. E. Gray, 1847 represented as Tectura J. E. Gray, 1847
- Species Acmaea achates (Reeve, 1855)
- Species Acmaea acutapex S. S. Berry, 1960 accepted as Lottia acutapex (S. S. Berry, 1960)
- Species Acmaea alba Tenison Woods, 1877 accepted as Scutellastra chapmani (Tenison Woods, 1876)
- Species Acmaea albescens R. A. Philippi, 1846 accepted as Iothia albescens (R. A. Philippi, 1846)
- Species Acmaea albonotata E. A. Smith, 1901 accepted as Eoacmaea albonotata (E. A. Smith, 1901)
- Species Acmaea aleutica Dall, 1927 accepted as Erginus apicinus (Dall, 1879)
- Species Acmaea alveus (Conrad, 1831) accepted as Lottia alveus (Conrad, 1831)
- Species Acmaea ancylus Rathke, 1833 accepted as Lottia digitalis (Rathke, 1833)
- Species Acmaea antillarum (G. B. Sowerby I, 1834) accepted as Lottia antillarum G. B. Sowerby I, 1834
- Species Acmaea apicina Dall, 1879 accepted as Problacmaea apicina (Dall, 1879)
- Species Acmaea araucana (A. d'Orbigny, 1839) accepted as Scurria araucana (A. d'Orbigny, 1839)
- Species Acmaea atrata P. P. Carpenter, 1864 accepted as Lottia atrata (P. P. Carpenter, 1864)
- Species Acmaea bombayana E. A. Smith, 1911 accepted as Cellana radiata radiata (Born, 1778)
- Species Acmaea bourdoti Cossmann, 1902 † accepted as Patella bourdoti (Cossmann, 1902) †
- Species Acmaea calamus (Crosse & P. Fischer, 1864) accepted as Eoacmaea calamus (Crosse & P. Fischer, 1864)
- Species Acmaea cancellata Test, 1945
- Species Acmaea candeana (A. d'Orbigny, 1847) accepted as Lottia antillarum G. B. Sowerby I, 1834
- Species Acmaea carpenteri Pilsbry, 1891 accepted as Tectura tenera (C. B. Adams, 1845)
- Species Acmaea cassis Rathke, 1833 accepted as Lottia cassis (Rathke, 1833)
- Species Acmaea catalaunensis Cossmann, 1913 †
- Species Acmaea ceciliana (A. d'Orbigny, 1841) accepted as Scurria ceciliana (A. d'Orbigny, 1841)
- Species Acmaea chathamensis Pilsbry, 1891 accepted as Cellana rota (Gmelin, 1791)
- Species Acmaea cingulata F. W. Hutton, 1883 accepted as Radiacmea inconspicua (J. E. Gray, 1843)
- Species Acmaea clarki Van Winkle, 1918 †
- Species Acmaea coffea (Reeve, 1855) accepted as Scurria variabilis (G. B. Sowerby I, 1839)
- Species Acmaea cona Test, 1945 accepted as Lottia conus (Test, 1945)
- Species Acmaea concinna Lischke, 1870 accepted as Nipponacmea concinna (Lischke, 1870)
- Species Acmaea concreta S. S. Berry, 1963 accepted as Collisella stanfordiana (S. S. Berry, 1957)
- Species Acmaea conulus (Dunker, 1861) accepted as Patelloida conulus (Dunker, 1861)
- Species Acmaea conus Test, 1945 accepted as Lottia conus (Test, 1945)
- Species Acmaea cornea Test, 1945
- Species Acmaea corticata F. W. Hutton, 1880 accepted as Patelloida corticata (F. W. Hutton, 1880)
- Species Acmaea crucis Tenison Woods, 1876 accepted as Patelloida insignis (Menke, 1843)
- Species Acmaea curvissior Oberling, 1970 accepted as Williamia gussoni (O. G. Costa, 1829)
- Species Acmaea cymbula Hupé, 1854 accepted as Scurria scurra (R. P. Lesson, 1831)
- Species Acmaea daedala Suter, 1907 accepted as Notoacmea daedala (Suter, 1907)
- Species Acmaea dalliana Pilsbry, 1891 accepted as Lottia dalliana (Pilsbry, 1891)
- Species Acmaea depicta (Hinds, 1842) accepted as Tectura depicta (Hinds, 1842)
- Species Acmaea dickersoni Van Winkle, 1918 †
- Species Acmaea digitalis Rathke, 1833 accepted as Lottia digitalis (Rathke, 1833)
- Species Acmaea dittmeri H. J. Anderson, 1964 † accepted as Pseudococculina dittmeri (H. J. Anderson, 1964) †
- Species Acmaea dorsuosa A. Gould, 1859 accepted as Lottia dorsuosa (A. Gould, 1859)
- Species Acmaea dubia Wilckens, 1910 †
- Species Acmaea dulcis (Lamarck, 1803) †
- Species Acmaea eccentrica Test, 1945 accepted as Propilidium tasmanicum (Pilsbry, 1895)
- Species Acmaea edmitchelli Lipps, 1966 † accepted as Lottia edmitchelli (Lipps, 1966) †
- Species Acmaea elegans R. A. Philippi, 1846 accepted as Lottia antillarum G. B. Sowerby I, 1834
- Species Acmaea emydia Dall, 1914 accepted as Lottia emydia (Dall, 1914)
- Species Acmaea euglypta Dautzenberg & H. Fischer, 1897 accepted as Veleropilina euglypta (Dautzenberg & H. Fischer, 1897)
- Species Acmaea exilis R. A. Philippi, 1846 accepted as Patelloida exilis (R. A. Philippi, 1846)
- Species Acmaea fascicularis Menke, 1851 accepted as Lottia fascicularis (Menke, 1851)
- Species Acmaea fergusoni Wheat, 1913 accepted as Testudinalia testudinalis (O. F. Müller, 1776)
- Species Acmaea floccata (Reeve, 1855) accepted as Lottia mesoleuca (Menke, 1851)
- Species Acmaea fonsecana Pilsbry & H. N. Lowe, 1932 accepted as Notoacmea biradiata (Reeve, 1855)
- Species Acmaea fouae Test, 1945
- Species Acmaea funiculata (P. P. Carpenter, 1864) accepted as Niveotectura funiculata (P. P. Carpenter, 1864)
- Species Acmaea gabatella S. S. Berry, 1960
- Species Acmaea gallensis Winckworth, 1928 accepted as Lottia tranquebarica (Gmelin, 1791)
- Species Acmaea garrettii Pilsbry, 1891 accepted as Patelloida garrettii (Pilsbry, 1891)
- Species Acmaea goodmani S. S. Berry, 1960 accepted as Collisella stanfordiana (S. S. Berry, 1957)
- Species Acmaea hamillei P. Fischer, 1857 accepted as Plesiothyreus hamillei (P. Fischer, 1857)
- Species Acmaea hannonica É. Vincent, 1930 †
- Species Acmaea helmsi E. A. Smith, 1894 accepted as Notoacmea elongata (Quoy & Gaimard, 1834)
- Species Acmaea heroldi (Dunker, 1861) accepted as Patelloida heroldi (Dunker, 1861)
- Species Acmaea incognita (Friedbetg, 1928) † accepted as Tectura incognita Friedberg, 1928 †
- Species Acmaea inconspicua (J. E. Gray, 1843) accepted as Radiacmea inconspicua (J. E. Gray, 1843)
- Species Acmaea inquilinus Preston, 1913 accepted as Patelloida inquilinus (Preston, 1913)
- Species Acmaea insessa (Hinds, 1842) accepted as Discurria insessa (Hinds, 1842)
- Species Acmaea instabilis (A. Gould, 1846) accepted as Lottia instabilis (A. Gould, 1846)
- Species Acmaea intermedia Suter, 1907 accepted as Radiacmea intermedia (Suter, 1907)
- Species Acmaea irregularis Test, 1945
- Species Acmaea juanina Odhner, 1922
- Species Acmaea kolarovai Grabau & S. G. King, 1928 accepted as Collisella peitaihoensis (Grabau & S. G. King, 1928)
- Species Acmaea kuragiensis Yokoyama, 1920 accepted as Lepeta kuragiensis (Yokoyama, 1920)
- Species Acmaea laevigata Eichwald, 1850 † accepted as Tectura laevigata (Eichwald, 1850) †
- Species Acmaea laevigata Binkhorst, 1861 †
- Species Acmaea langfordi Schwengel, 1949 accepted as Lottia langfordi (Habe, 1944)
- Species Acmaea leucophaea R. A. Philippi, 1846 accepted as Scurria variabilis (G. B. Sowerby I, 1839)
- Species Acmaea leucopleura (Gmelin, 1791) accepted as Lottia leucopleura (Gmelin, 1791)
- Species Acmaea limatula (P. P. Carpenter, 1864) accepted as Lottia limatula (P. P. Carpenter, 1864)
- Species Acmaea lineata R. A. Philippi, 1846 accepted as Patelloida lineata (R. A. Philippi, 1846)
- Species Acmaea maraisi Kilburn, 1977 accepted as Asteracmea maraisi (Kilburn, 1977)
- Species Acmaea marceauxi (Deshayes, 1861) †
- Species Acmaea marcusi Righi, 1966 accepted as Lottia marcusi (Righi, 1966)
- Species Acmaea marmorata Tenison Woods, 1876 accepted as Patelloida latistrigata (Angas, 1865)
- Subspecies Acmaea marmorata submarmorata Pilsbry, 1891 accepted as Patelloida latistrigata (Angas, 1865)
- Species Acmaea martinezensis Dickerson, 1914 †
- Species Acmaea mesoleuca Menke, 1851 accepted as Lottia mesoleuca (Menke, 1851)
- Species Acmaea minutissima E. A. Smith, 1904 accepted as Cocculinella minutissima (E. A. Smith, 1904)
- Species Acmaea mitchelli Lipps, 1963 † accepted as Lottia edmitchelli (Lipps, 1966) †
- Species Acmaea mitella Menke, 1847
- Species Acmaea mitra Rathke, 1833
- Species Acmaea mufria Hedley, 1915 accepted as Patelloida mufria (Hedley, 1915)
- Species Acmaea multistriata W. H. Turton, 1932
- Species Acmaea mutabilis Menke, 1851 accepted as Lottia discors (R. A. Philippi, 1849)
- Species Acmaea nanshaensis Y.-Y. Liu, 1991
- Species Acmaea neglecta Schepman, 1908
- Species Acmaea nisoria R. A. Philippi, 1846 accepted as Scurria variabilis (G. B. Sowerby I, 1839)
- Species Acmaea nojimensis Yokoyama, 1920 †
- Species Acmaea norohensis E. A. Smith, 1890 accepted as Lottia noronhensis (E. A. Smith, 1890)
- Species Acmaea oakvillensis Van Winkle, 1918 †
- Species Acmaea oblongata Yokoyama, 1926 accepted as Siphonacmea oblongata (Yokoyama, 1926)
- Species Acmaea ochracea (Dall, 1871) accepted as Lottia instabilis (A. Gould, 1846)
- Species Acmaea orbignyi Dall, 1909 accepted as Lottia orbignyi (Dall, 1909)
- Species Acmaea ordinaria W. H. Turton, 1932 accepted as Helcion pectunculus (Gmelin, 1791)
- Species Acmaea paleacea A. Gould, 1853 accepted as Tectura paleacea (A. Gould, 1853)
- Species Acmaea paradigitalis Fritchman, 1960 accepted as Lottia paradigitalis (Fritchman, 1960)
- Species Acmaea parasitica (A. d'Orbigny, 1841) accepted as Scurria variabilis (G. B. Sowerby I, 1839)
- Species Acmaea parva (Angas, 1879) accepted as Naccula parva (Angas, 1879)
- Species Acmaea parviconoidea Suter, 1907 accepted as Notoacmea parviconoidea (Suter, 1907)
- Species Acmaea patellavecta Verco, 1912 accepted as Patelloida nigrosulcata (Reeve, 1855)
- Species Acmaea patina Rathke, 1833 accepted as Collisella patina (Rathke, 1833)
- Species Acmaea pediculus (R. A. Philippi, 1846) accepted as Lottia pediculus (R. A. Philippi, 1846)
- Species Acmaea peitaihoensis Grabau & S. G. King, 1928 accepted as Collisella peitaihoensis (Grabau & S. G. King, 1928)
- Species Acmaea pelta Rathke, 1833 accepted as Lottia pelta (Rathke, 1833)
- Species Acmaea perconica Preston, 1913 accepted as Patelloida perconica (Preston, 1913)
- Species Acmaea persona Rathke, 1833 accepted as Lottia persona (Rathke, 1833)
- Species Acmaea petterdi Tenison Woods, 1877 accepted as Notoacmea petterdi (Tenison Woods, 1877)
- Species Acmaea pileolus (Middendorff, 1848)
- Species Acmaea plana R. A. Philippi, 1846 accepted as Scurria plana (R. A. Philippi, 1846)
- Species Acmaea profunda (Deshayes, 1863) accepted as Eoacmaea profunda (Deshayes, 1863)
- Species Acmaea pseudocorticata Iredale, 1908 accepted as Patelloida corticata (F. W. Hutton, 1880)
- Species Acmaea pulcherrima Dall, 1927 accepted as Eoacmaea pustulata (Helbling, 1779)
- Species Acmaea punctatissima R. A. Philippi, 1846 accepted as Scurria variabilis (G. B. Sowerby I, 1839)
- Species Acmaea puncturata (Lamarck, 1819) accepted as Eoacmaea pustulata (Helbling, 1779)
- Species Acmaea punicea W. H. Turton, 1932 accepted as Helcion pectunculus (Gmelin, 1791)
- Species Acmaea pustulata (Helbling, 1779) accepted as Eoacmaea pustulata (Helbling, 1779)
- Species Acmaea radiata Rathke, 1833 accepted as Lottia persona (Rathke, 1833)
- Species Acmaea rigida Kaunhowen, 1898 †
- Species Acmaea rosea (Dall, 1872) accepted as Rhodopetala rosea (Dall, 1872)
- Species Acmaea roseoradiata Suter, 1907 accepted as Asteracmea suteri (Iredale, 1915)
- Species Acmaea roseoradiata E. A. Smith, 1901 accepted as Asteracmea roseoradiata (E. A. Smith, 1901)
- Species Acmaea rubella (O. Fabricius, 1780) accepted as Erginus rubellus (O. Fabricius, 1780)
- Species Acmaea saccharina (Linnaeus, 1758) accepted as Patelloida saccharina (Linnaeus, 1758)
- Species Acmaea scabra (A. Gould, 1846) accepted as Lottia scabra (A. Gould, 1846)
- Species Acmaea scabrilirata Angas, 1865 accepted as Notoacmea flammea (Quoy & Gaimard, 1834)
- Species Acmaea scapha Suter, 1907 accepted as Notoacmea scapha (Suter, 1907)
- Species Acmaea schrenckii Lischke, 1868 accepted as Nipponacmea schrenckii (Lischke, 1868)
- Species Acmaea scutatella (Lamarck, 1803) †
- Species Acmaea scutum Rathke, 1833 accepted as Lottia scutum (Rathke, 1833)
- Species Acmaea semicornea Preston, 1908 accepted as Discradisca semicornea (Preston, 1908)
- Species Acmaea semirubida Dall, 1914 accepted as Eoacmaea semirubida (Dall, 1914)
- Species Acmaea simplex Dickerson, 1917 †
- Species Acmaea stanfordiana S. S. Berry, 1957 accepted as Lottia stanfordiana (S. S. Berry, 1957)
- Species Acmaea striata (Quoy & Gaimard, 1834) accepted as Patelloida striata Quoy & Gaimard, 1834
- Species Acmaea striatocostata Sinzov, 1892 † accepted as Flexitectura subcostata (Sinzov, 1892) †
- Species Acmaea strigatella P. P. Carpenter, 1864 accepted as Lottia strigatella (P. P. Carpenter, 1864)
- Species Acmaea strongiana Hertlein, 1958 accepted as Lottia strongiana (Hertlein, 1958)
- Species Acmaea subcostata Sinzov, 1892 † accepted as Flexitectura subcostata (Sinzov, 1892) †
- Species Acmaea submesidia Stilwell, Zinsmeister & Oleinik, 2004 †
- Species Acmaea subrugosa A. d'Orbigny, 1841 accepted as Lottia subrugosa (A. d'Orbigny, 1841)
- Species Acmaea subundulata Angas, 1865 accepted as Notoacmea flammea (Quoy & Gaimard, 1834)
- Species Acmaea tejonensis Gabb, 1869 † accepted as Patelloida tejonensis (Gabb, 1869) †
- Species Acmaea tenuissima Sinzov, 1892 † accepted as Flexitectura tenuissima (Sinzov, 1892) †
- Species Acmaea tessulata (O. F. Müller, 1776) accepted as Testudinalia tessulata (O. F. Müller, 1776)
- Species Acmaea testudinalis (O. F. Müller, 1776) accepted as Testudinalia testudinalis (O. F. Müller, 1776)
- Species Acmaea transparens Test, 1945
- Species Acmaea travancorica Preston, 1911 accepted as Cellana radiata (Born, 1778)
- Species Acmaea turveri Hertlein & A. M. Strong, 1951 accepted as Lottia turveri (Hertlein & A. M. Strong, 1951)
- Species Acmaea unicolor (Forbes, 1844) accepted as Tectura virginea (O. F. Müller, 1776)
- Species Acmaea variabilis (G. B. Sowerby I, 1839) accepted as Scurria variabilis (G. B. Sowerby I, 1839)
- Species Acmaea vernicosa P. P. Carpenter, 1865 accepted as Notoacmea biradiata (Reeve, 1855)
- Species Acmaea virginea (O. F. Müller, 1776) accepted as Tectura virginea (O. F. Müller, 1776)
- Species Acmaea viridula (Lamarck, 1819) accepted as Scurria viridula (Lamarck, 1819)
- Species Acmaea vokesi Hickman, 1980 † accepted as Patelloida vokesi (Hickman, 1980) †
- Species Acmaea wottonae Christiaens, 1975 accepted as Lottia antillarum G. B. Sowerby I, 1834
- Species Acmaea zografi Dautzenberg & H. Fischer, 1896 accepted as Veleropilina zografi (Dautzenberg & H. Fischer, 1896)
- Genus Acmea [sic] accepted as Acmaea Eschscholtz, 1833
- Genus Deslongchampsia McCoy, 1851 †
- Genus Dietrichiella Dacqué, 1934 † (1)
- Genus Guerangeria Cossmann, 1885 † accepted as Marbodaeia Chelot, 1886 †
- Genus Hennocquia Dacqué, 1934 † (2)
- Genus Marbodaeia Chelot, 1886 † (3)
- Genus Marbodeia [sic] † accepted as Marbodaeia Chelot, 1886 †
- Genus Pseudorhytidopilus L. R. Cox, 1960 † (1)
- Genus Scurriopsis Gemmellaro, 1879 † (3)
- Family Bertiniidae Jousseaume, 1883 accepted as Nacellidae Thiele, 1891
- Family Damilinidae Horný, 1961 † (14)
- Family Eoacmaeidae T. Nakano & Ozawa, 2007 (15)
- Family Erginidae A. V. Chernyshev, 2018 accepted as Rhodopetalidae Lindberg, 1981
- Family Lepetidae Gray, 1850 (24)
- Family Lepetopsidae J. H. McLean, 1990 † (11)
- Family Lottidae [sic] accepted as Lottiidae Gray, 1840
- Family Lottiidae Gray, 1840 (191)
- Family Neolepetopsidae J. H. McLean, 1990 (18)
- Family Patelloididae Chapman & Gabriel, 1923 accepted as Patelloidini Chapman & Gabriel, 1923
- Family Pectinodontidae Pilsbry, 1891 (32)
- Family Propilidiidae accepted as Lepetidae Gray, 1850
- Family Rhodopetalidae Lindberg, 1981 (7)
- Family Tecturidae J. E. Gray, 1847 accepted as Tecturinae J. E. Gray, 1847
- Superfamily Nacelloidea Thiele, 1891 accepted as Patelloidea Rafinesque, 1815
- Superfamily Neolepetopsoidea J. H. McLean, 1990 accepted as Lottioidea Gray, 1840
- Superfamily Patelloidea Rafinesque, 1815 (177)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 782)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 377)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata