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Mollusca (132 848)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 011)
Class Caudofoveata (143)
Class Cephalopoda (1 834)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 752)
Subclass Amphigastropoda † (396)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 669)
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 172)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 449)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 121)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 585)
Order Aillyida accepted as Achatinina
Order Ellobiida (579)
Order Gymnomorpha accepted as Systellommatophora
Order Stylommatophora (24 782)
Suborder Achatinina (2 912)
Suborder Elasmognatha accepted as Succineoidei
Suborder Helicina (21 630)
Infraorder Arionoidei (140)
Infraorder Clausilioidei (1 859)
Infraorder Helicina incertae sedis (3 210)
Superfamily Coelociontoidea Iredale, 1937 (5)
Superfamily Papillodermatoidea Wiktor, R. Martin & Castillejo, 1990 (1)
Superfamily Plectopyloidea Möllendorff, 1898 (144)
Superfamily Punctoidea E. S. Morse, 1864 (1 789)
Superfamily Testacelloidea J. E. Gray, 1840 (20)
Superfamily Urocoptoidea Pilsbry, 1898 (1868) (1 251)
Family Cerionidae Pilsbry, 1901 (192)
Family Cylindrellidae Tryon, 1868 accepted as Urocoptinae Pilsbry, 1898 (1868)
Family Epirobiidae F. G. Thompson, 2012 (22)
Family Eucalodiidae P. Fischer & Crosse, 1873 (86)
Genus Anisospira Strebel & Pfeffer, 1880 (7)
Genus Coelocentrum Crosse & P. Fischer, 1872 (33)
Genus Condonella McLellan, 1927 † (1)
Genus Dissotropis Bartsch, 1906 (5)
Genus Eucalodium Crosse & P. Fischer, 1868 (40)
Subgenus Eucalodium (Anisospira) Strebel & Pfeffer, 1880 accepted as Anisospira Strebel & Pfeffer, 1880
Subgenus Eucalodium (Bradyplax) F. G. Thompson, 2014 represented as Eucalodium Crosse & P. Fischer, 1868
Species Eucalodium (Bradyplax) aglacyma F. G. Thompson, 2014 represented as Eucalodium aglacyma F. G. Thompson, 2014
Species Eucalodium (Bradyplax) ischnostele (Pilsbry, 1909) represented as Eucalodium ischnostele (Pilsbry, 1909)
Subgenus Eucalodium (Eucalodium) Crosse & P. Fischer, 1868 represented as Eucalodium Crosse & P. Fischer, 1868
Subgenus Eucalodium (Oligostylus) Pilsbry, 1895 represented as Eucalodium Crosse & P. Fischer, 1868
Subgenus Eucalodium (Ptychocentrum) Bartsch, 1943 represented as Eucalodium Crosse & P. Fischer, 1868
Subgenus Eucalodium (Resupinata) E. von Martens, 1897 represented as Eucalodium Crosse & P. Fischer, 1868
Species Eucalodium aglacyma F. G. Thompson, 2014
Species Eucalodium arduum F. G. Thompson, 2014
Species Eucalodium australe F. G. Thompson, 1963
Species Eucalodium australis F. G. Thompson, 1963 accepted as Eucalodium australe F. G. Thompson, 1963
Species Eucalodium belizense F. G. Thompson & D. C. Dourson, 2013
Species Eucalodium blandianum Crosse & P. Fischer, 1868
Species Eucalodium cereum Strebel, 1880
Species Eucalodium cervinum F. G. Thompson, 2014
Species Eucalodium cervinus F. G. Thompson, 2014 accepted as Eucalodium cervinum F. G. Thompson, 2014
Species Eucalodium comalapense F. G. Thompson, 2014
Species Eucalodium compactum Pilsbry, 1893
Species Eucalodium cyclops F. G. Thompson, 2014
Species Eucalodium dalli E. von Martens, 1901 accepted as Anisospira dalli (E. von Martens, 1901)
Species Eucalodium decollatum (Nyst, 1841)
Species Eucalodium decurtatum (H. Adams, 1872)
Species Eucalodium densecostatum Strebel, 1880
Species Eucalodium deshayesianum Crosse & P. Fischer, 1872
Species Eucalodium edwardsianum Crosse & P. Fischer, 1872
Species Eucalodium eophilum T. D. A. Cockerell, 1915 †
Species Eucalodium erugatum F. G. Thompson, 2014
Species Eucalodium eurystoma F. G. Thompson, 2014
Species Eucalodium filicostatum F. G. Thompson, 2014
Species Eucalodium grande (L. Pfeiffer, 1860)
Species Eucalodium guatemalense Bartsch, 1906
Species Eucalodium hegewischi (Bartsch, 1947)
Species Eucalodium hippocastaneum Dall, 1897
Species Eucalodium huehuetenangoense F. G. Thompson, 2014
Species Eucalodium insigne Crosse & P. Fischer, 1872
Species Eucalodium ischnostele (Pilsbry, 1909)
Species Eucalodium mariae (Bartsch, 1947)
Species Eucalodium marianum (Bartsch, 1943)
Species Eucalodium mexicanum (L. Pfeiffer, 1860)
Species Eucalodium moussonianum Crosse & P. Fischer, 1872
Species Eucalodium neglectum Crosse & P. Fischer, 1872
Species Eucalodium obesum F. G. Thompson, 2014
Species Eucalodium otoides F. G. Thompson, 1968
Species Eucalodium slapcinskyi F. G. Thompson, 2014
Species Eucalodium smithi F. G. Thompson, 2014
Species Eucalodium speciosum (Dunker, 1844)
Species Eucalodium splendidum (L. Pfeiffer, 1860)
Species Eucalodium strebeli E. von Martens, 1897
Species Eucalodium sumichrasti Crosse & P. Fischer, 1878
Species Eucalodium vonmartensi Strebel, 1880 accepted as Anisospira vonmartensi (Strebel, 1880)
Species Eucalodium walpoleanum Crosse & P. Fischer, 1872
Genus Eucolodium accepted as Eucalodium Crosse & P. Fischer, 1868
Genus Liocentrum Pilsbry, 1902 accepted as Coelocentrum (Gymnocentrum) Pilsbry, 1942
Genus Oligostylus Pilsbry, 1895 accepted as Eucalodium (Oligostylus) Pilsbry, 1895
Genus Thaumasia Albers, 1850 accepted as Eucalodium Crosse & P. Fischer, 1868
Family Holospiridae Pilsbry, 1946 (164)
Family Urocoptidae Pilsbry, 1898 (1868) (787)
Infraorder Helicoidei (5 691)
Infraorder Limacoidei (4 251)
Infraorder Oleacinoidei (497)
Infraorder Orthalicoidei (1 581)
Infraorder Partuloinei accepted as Pupilloidei
Infraorder Pupilloidei (3 436)
Infraorder Rhytidoidei (581)
Infraorder Sagdoinei accepted as Helicoidei
Infraorder Succineoidei (384)
Suborder Orthurethra accepted as Pupilloidei
Suborder Scolodontina (165)
Suborder Sigmurethra accepted as Helicina
Suborder Stylommatophora incertae sedis (75)
Order Systellommatophora (224)
Superorder Hygrophila (2 005)
Superorder Pneumopulmonata
Superorder Pylopulmonata (4 285)
Superorder Sacoglossa (391)
Superorder Siphonarimorpha (163)
Order Anaspidea accepted as Aplysiida
Order Aplysiida (101)
Order Aplysiomorpha accepted as Aplysiida
Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
Order Bullomorpha accepted as Cephalaspidea
Order Cephalaspidea (1 034)
Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
Order Pteropoda (414)
Order Runcinacea accepted as Runcinida
Order Runcinida (80)
Order Tectibranchiata
Order Thecosomata
Order Umbraculida (15)
Superorder Euthyneura incertae sedis
Infraclass Heterobranchia incertae sedis (478)
Infraclass Mesoneura (108)
Infraclass Opisthobranchia
Infraclass Pulmonata
Subclass Neomphaliones accepted as Vetigastropoda
Subclass Neritimorpha (1 914)
Subclass Orthogastropoda represented as Gastropoda
Subclass Patellogastropoda (511)
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