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Mollusca (133 383)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 100)
Class Caudofoveata (143)
Class Cephalopoda (1 931)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (103 095)
Subclass Amphigastropoda † (439)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 891)
Subclass Gastropoda incertae sedis (313)
Subclass Heterobranchia (39 230)
Infraclass "Lower Heterobranchia" (1 140)
Infraclass Euthyneura (37 503)
Subterclass Acteonimorpha (413)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 173)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 628)
Order Aillyida accepted as Achatinina
Order Ellobiida (579)
Order Gymnomorpha accepted as Systellommatophora
Order Stylommatophora (24 825)
Suborder Achatinina (2 912)
Suborder Elasmognatha accepted as Succineoidei
Suborder Helicina (21 673)
Infraorder Arionoidei (140)
Infraorder Clausilioidei (1 859)
Infraorder Helicina incertae sedis (3 216)
Superfamily Coelociontoidea Iredale, 1937 (5)
Superfamily Discoidea Thiele, 1931 (159)
Family Discidae Thiele, 1931 (1866) (91)
Family Oreohelicidae Pilsbry, 1939 (68)
Genus Oreohelix Pilsbry, 1904 (49)
Subgenus Oreohelix (Oreohelix) Pilsbry, 1904 accepted as Oreohelix Pilsbry, 1904
Subgenus Oreohelix (Radiocentrum) Pilsbry, 1905 † accepted as Radiocentrum Pilsbry, 1905
Species Oreohelix alpina (Elrod, 1901)
Species Oreohelix amariradix Pilsbry, 1933
Species Oreohelix anchana Gregg, 1953
Species Oreohelix angulifera (Whiteaves, 1885) † accepted as Radiocentrum anguliferum (Whiteaves, 1885) †
Species Oreohelix barbata Pilsbry, 1905
Species Oreohelix brandi Pierce, 1992 †
Species Oreohelix caballoensis Metcalf, 1974
Species Oreohelix californica S. S. Berry, 1931
Species Oreohelix carinifera Pilsbry, 1912
Species Oreohelix chiricahuana Pilsbry, 1905 accepted as Radiocentrum chiricahuanum (Pilsbry, 1905)
Species Oreohelix clappi Ferriss, 1904 accepted as Radiocentrum clappi (Ferriss, 1904)
Species Oreohelix concentrata (Dall, 1895)
Species Oreohelix confragosa Metcalf, 1974
Species Oreohelix cooperi (W. G. Binney, 1858) accepted as Oreohelix strigosa cooperi (W. G. Binney, 1858)
Species Oreohelix dawsonae Pierce, 2001 †
Species Oreohelix elrodi (Pilsbry, 1900)
Species Oreohelix eurekensis J. Henderson & Daniels, 1916
Species Oreohelix flammulifer S. S. Berry, 1932 accepted as Oreohelix vortex S. S. Berry, 1932
Species Oreohelix florida Pilsbry, 1939
Species Oreohelix grahamensis Gregg & W. B. Miller, 1974
Species Oreohelix grangeri T. D. A. Cockerell & J. Henderson, 1912 † accepted as Radiocentrum grangeri (T. D. A. Cockerell & J. Henderson, 1912) †
Species Oreohelix hammeri Fairbanks, 1984
Species Oreohelix handi Pilsbry & Ferriss, 1917
Species Oreohelix haydeni (Gabb, 1869)
Subspecies Oreohelix haydeni alta Pilsbry, 1913
Subspecies Oreohelix haydeni betheli Pilsbry & T. D. A. Cockerell, 1913
Subspecies Oreohelix haydeni bruneri (Ancey, 1881)
Subspecies Oreohelix haydeni corrugata J. Henderson & Daniels, 1916
Subspecies Oreohelix haydeni haydeni (Gabb, 1869)
Subspecies Oreohelix haydeni hesperia Pilsbry, 1939
Subspecies Oreohelix haydeni hybrida (Hemphill, 1890)
Subspecies Oreohelix haydeni mixta Pilsbry, 1916
Subspecies Oreohelix haydeni oquirrhensis (Hemphill, 1886)
Subspecies Oreohelix haydeni perplexa Pilsbry, 1939
Subspecies Oreohelix haydeni utahensis (Hemphill, 1886) accepted as Oreohelix haydeni oquirrhensis (Hemphill, 1886)
Variety Oreohelix haydeni var. alta Pilsbry, 1913 accepted as Oreohelix haydeni alta Pilsbry, 1913
Species Oreohelix hemphilli (Newcomb, 1869) accepted as Oreohelix hemphillii (Newcomb, 1869)
Species Oreohelix hemphillii (Newcomb, 1869)
Species Oreohelix hendersoni Pilsbry, 1912
Species Oreohelix houghi W. B. Marshall, 1929
Species Oreohelix howardi D. T. Jones, 1944
Species Oreohelix idahoensis (Newcomb, 1866)
Species Oreohelix intersum (Hemphill, 1890)
Species Oreohelix jugalis (Hemphill, 1890)
Species Oreohelix junii Pilsbry, 1933
Species Oreohelix lecontei (Stearns, 1902) † accepted as Discus lecontei (Stearns, 1902) †
Species Oreohelix litoralis Crews & Metcalf, 1982
Species Oreohelix loisae Ports, 2004
Species Oreohelix luofuensis W. Yü, 1977 †
Species Oreohelix maculata J. Henderson, 1921 accepted as Oreohelix pygmaea maculata J. Henderson, 1921
Species Oreohelix magdalenae Pilsbry, 1939
Species Oreohelix megarche T. D. A. Cockerell & J. Henderson, 1912 † accepted as Glyptostoma spatiosum (Meek & Hayden, 1861) †
Species Oreohelix metcalfei T. D. A. Cockerell, 1905
Species Oreohelix nacimientensis (C. A. White, 1886) †
Species Oreohelix neomexicana Pilsbry, 1905
Species Oreohelix nevadensis S. S. Berry, 1932
Species Oreohelix obtusata (Whiteaves, 1885) †
Species Oreohelix oterana Metcalf, 1982 †
Species Oreohelix parawanensis Gregg, 1941
Species Oreohelix penascana Metcalf & Crews, 1982 †
Species Oreohelix peripheria (C. A. White, 1876) †
Species Oreohelix peripherica (Ancey, 1881)
Species Oreohelix pilsbryi Ferriss, 1917
Species Oreohelix pygmaea Pilsbry, 1913
Species Oreohelix rotundata L. S. Russell, 1931 † accepted as Glypterpes rotundatus (L. S. Russell, 1931) †
Species Oreohelix strigosa (A. Gould, 1846)
Species Oreohelix subrudis (Reeve, 1854)
Species Oreohelix swopei Pilsbry & Ferriss, 1917
Species Oreohelix tenuistriata J. Henderson & Daniels, 1916
Species Oreohelix thurstoni (L. S. Russell, 1926) † accepted as Radiocentrum thurstoni (L. S. Russell, 1926) †
Species Oreohelix variabilis J. Henderson, 1929
Species Oreohelix vortex S. S. Berry, 1932
Species Oreohelix waltoni Solem, 1975
Species Oreohelix yavapai Pilsbry, 1905
Genus Radiocentrum Pilsbry, 1905 (19)
Superfamily Papillodermatoidea Wiktor, R. Martin & Castillejo, 1990 (1)
Superfamily Plectopyloidea Möllendorff, 1898 (144)
Superfamily Punctoidea E. S. Morse, 1864 (1 630)
Superfamily Testacelloidea J. E. Gray, 1840 (20)
Superfamily Urocoptoidea Pilsbry, 1898 (1868) (1 257)
Infraorder Helicoidei (5 697)
Infraorder Limacoidei (4 247)
Infraorder Oleacinoidei (497)
Infraorder Orthalicoidei (1 587)
Infraorder Partuloinei accepted as Pupilloidei
Infraorder Pupilloidei (3 466)
Infraorder Rhytidoidei (580)
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 (2 008)
Superorder Pneumopulmonata
Superorder Pylopulmonata (4 287)
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 (1 038)
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 (109)
Infraclass Opisthobranchia
Infraclass Pulmonata
Subclass Neomphaliones accepted as Vetigastropoda
Subclass Neritimorpha (1 916)
Subclass Orthogastropoda represented as Gastropoda
Subclass Patellogastropoda (517)
Subclass Prosobranchia
Subclass Psilogastropoda represented as Gastropoda
Subclass Vetigastropoda (6 789)
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 (1 381)
Class Polyplaxiphora accepted as Polyplacophora
Class Rostroconchia † (64)
Class Scaphopoda (754)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata