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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Class Caudofoveata (143)
- Class Cephalopoda (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 623)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 154)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 431)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 103)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 567)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 764)
- Suborder Achatinina (2 899)
- Superfamily Achatinoidea Swainson, 1840 (1 328)
- Superfamily Streptaxoidea J. E. Gray, 1860 (1 571)
- Family Artemonidae Bourguignat, 1890 accepted as Streptaxinae J. E. Gray, 1860
- Family Diapheridae Panha & Naggs, 2010 (183)
- Family Enneidae Bourguignat, 1883 accepted as Enneinae Bourguignat, 1883
- Family Orthogibbidae Germain, 1921 accepted as Orthogibbinae Germain, 1921
- Family Streptaxidae J. E. Gray, 1860 (1 388)
- Subfamily Enneinae Bourguignat, 1883 (265)
- Subfamily Gibbinae Steenberg, 1936 accepted as Orthogibbinae Germain, 1921
- Subfamily Gonidominae Steenberg, 1936 accepted as Orthogibbinae Germain, 1921
- Subfamily Gulellinae Rowson, 2024 (548)
- Subfamily Marconiinae Schileyko, 2000 (49)
- Subfamily Odontartemoninae Schileyko, 2000 (39)
- Subfamily Orthogibbinae Germain, 1921 (165)
- Subfamily Primigulellinae Rowson, 2024 (41)
- Subfamily Ptychotrematinae Pilsbry, 1919 accepted as Enneinae Bourguignat, 1883
- Subfamily Streptaxinae J. E. Gray, 1860 (276)
- Genus Afristreptaxis Thiele, 1932 (10)
- Genus Alcidia Bourguignat, 1890 accepted as Streptaxis J. E. Gray, 1837
- Genus Artemon H. Beck, 1837 accepted as Streptaxis J. E. Gray, 1837
- Genus Carinartemis Siriboon & Panha, 2014 (5)
- Genus Discartemon L. Pfeiffer, 1856 (32)
- Genus Edentulina L. Pfeiffer, 1856 (27)
- Genus Elma H. Adams, 1866 (10)
- Genus Embertonina Rowson, 2024 (10)
- Genus Fischerpietteus K. C. Emberton, 2003 (7)
- Genus Glyptoconus Möllendorff, 1894 (1)
- Genus Haploptychius Kobelt, 1905 (33)
- Genus Hypselartemon Wenz, 1947 (4)
- Genus Indoartemon Forcart, 1946 (15)
- Genus Makrokonche K. C. Emberton, 1994 (6)
- Genus Martinella Jousseaume, 1887 (1)
- Genus Micrartemon Möllendorff, 1890 (1)
- Genus Nagyelma Páll-Gergely & Hunyadi, 2021 (1)
- Genus Odontartemon L. Pfeiffer, 1856 (1)
- Genus Oophana Ancey, 1884 (19)
- Genus Pallgergelyia Thach, 2017 (1)
- Genus Perrottetia Kobelt, 1905 (36)
- Genus Protostreptaxis W. Yü & X.-Q. Zhang, 1982 † (1)
- Genus Rectartemon H. B. Baker, 1925 (11)
- Genus Sairostoma F. Haas, 1938 (1)
- Genus Stemmatopsis Mabille, 1887 (5)
- Genus Streptartemon Kobelt, 1905 (15)
- Genus Streptaxis J. E. Gray, 1837 (22)
- Subgenus Streptaxis (Artemon) H. Beck, 1837 accepted as Streptaxis J. E. Gray, 1837
- Subgenus Streptaxis (Artemonopsis) Germain, 1908 accepted as Artemonopsis Germain, 1908
- Subgenus Streptaxis (Discartemon) L. Pfeiffer, 1856 accepted as Discartemon L. Pfeiffer, 1856
- Subgenus Streptaxis (Edentulina) L. Pfeiffer, 1856 accepted as Edentulina L. Pfeiffer, 1856
- Subgenus Streptaxis (Eustreptaxis) L. Pfeiffer, 1878 accepted as Eustreptaxis L. Pfeiffer, 1878
- Subgenus Streptaxis (Happia) Bourguignat, 1890 accepted as Happia Bourguignat, 1890
- Subgenus Streptaxis (Imperturbatia) E. von Martens, 1898 accepted as Imperturbatia E. von Martens, 1898
- Species Streptaxis (Imperturbatia) braueri E. von Martens, 1898 accepted as Augustula braueri (E. von Martens, 1898)
- Species Streptaxis (Imperturbatia) constans E. von Martens, 1898 accepted as Imperturbatia constans (E. von Martens, 1898)
- Species Streptaxis (Imperturbatia) perelegans E. von Martens, 1898 accepted as Careoradula perelegans (E. von Martens, 1898)
- Species Streptaxis (Imperturbatia) violascens E. von Martens, 1898 accepted as Imperturbatia violascens (E. von Martens, 1898)
- Subgenus Streptaxis (Lamelliger) Ancey, 1884 accepted as Lamelliger Ancey, 1884
- Subgenus Streptaxis (Micrartemon) Möllendorf, 1890 accepted as Micrartemon Möllendorff, 1890
- Subgenus Streptaxis (Odontartemon) L. Pfeiffer, 1856 represented as Odontartemon L. Pfeiffer, 1856
- Subgenus Streptaxis (Oophana) Ancey, 1884 accepted as Oophana Ancey, 1884
- Subgenus Streptaxis (Polygyratia) J. E. Gray, 1847 accepted as Polygyratia J. E. Gray, 1847
- Subgenus Streptaxis (Rectartemon) H. B. Baker, 1925 accepted as Rectartemon H. B. Baker, 1925
- Subgenus Streptaxis (Scolodonta) Doering, 1875 accepted as Scolodonta Doering, 1875
- Subgenus Streptaxis (Streptartemon) Kobelt, 1905 represented as Streptartemon Kobelt, 1905
- Species Streptaxis aberratus (Souleyet, 1852) accepted as Perrottetia aberrata (Souleyet, 1852)
- Species Streptaxis abunaensis F. Baker, 1914 accepted as Streptartemon abunaensis (F. Baker, 1914)
- Species Streptaxis albida L. Pfeiffer, 1845 accepted as Gonaxis albidus (L. Pfeiffer, 1845)
- Species Streptaxis alminoaffonsicum (Maury, 1934) †
- Species Streptaxis alveus Dunker, 1845 accepted as Hypselartemon alveus (Dunker, 1845)
- Species Streptaxis anceyi Mabille, 1887 accepted as Haploptychius anceyi (Mabille, 1887)
- Species Streptaxis andamanicus W. H. Benson, 1860 accepted as Haploptychius andamanicus (W. H. Benson, 1860)
- Species Streptaxis anomphalus Pilsbry, 1935
- Species Streptaxis apertus E. von Martens, 1868 accepted as Rectartemon depressus (Heynemann, 1868)
- Species Streptaxis balansai Mabille, 1889
- Species Streptaxis beddomii W. T. Blanford, 1899 accepted as Perrottetia beddomei (W. T. Blanford, 1899)
- Species Streptaxis bethencourti Nobre, 1905 accepted as Gonaxis bethencourti (Nobre, 1905)
- Species Streptaxis bidens Möllendorff, 1883 accepted as Indoartemon bidens (Möllendorff, 1883)
- Species Streptaxis birmanica Theobald, 1864 accepted as Haploptychius blanfordi (Theobald, 1864)
- Species Streptaxis blaisei Dautzenberg & H. Fischer, 1905 accepted as Haploptychius blaisei (Dautzenberg & H. Fischer, 1905)
- Species Streptaxis blanfordi Theobald, 1864 accepted as Haploptychius blanfordi (Theobald, 1864)
- Species Streptaxis boettgeri Möllendorff, 1890 accepted as Micrartemon boettgeri (Möllendorff, 1890)
- Species Streptaxis borealis Heude, 1882
- Species Streptaxis bottegoi E. von Martens, 1895 accepted as Gonaxis bottegoi (E. von Martens, 1895)
- Species Streptaxis burmanica W. T. Blanford, 1865 accepted as Streptaxis burmanicus W. T. Blanford, 1865
- Species Streptaxis burmanicus W. T. Blanford, 1865 accepted as Haploptychius burmanicus (W. T. Blanford, 1865)
- Species Streptaxis camerunensis d'Ailly, 1896 accepted as Gonaxis camerunensis (d'Ailly, 1896)
- Species Streptaxis canarica W. T. Blanford, 1869 accepted as Perrottetia canarica (W. T. Blanford, 1869)
- Species Streptaxis candei Petit de la Saussaye, 1842
- Species Streptaxis candidus (Spix, 1827) accepted as Rectartemon candidus (Spix, 1827)
- Species Streptaxis capillosus Pilsbry, 1897
- Species Streptaxis cavallii Pollonera, 1906 accepted as Gonaxis cavallii (Pollonera, 1906)
- Species Streptaxis cavicola Gredler, 1881 accepted as Kaliella cavicola (Gredler, 1881)
- Species Streptaxis celebicus P. Sarasin & F. Sarasin, 1899 accepted as Haploptychius celebicus (P. Sarasin & F. Sarasin, 1899)
- Species Streptaxis cingalensis W. H. Benson, 1853 accepted as Indoartemon cingalensis (W. H. Benson, 1853)
- Species Streptaxis collingei Sykes, 1902 accepted as Discartemon collingei (Sykes, 1902)
- Species Streptaxis compressus W. T. Blanford, 1881 accepted as Perrottetia compressa (W. T. Blanford, 1881)
- Species Streptaxis concinnus W. T. Blanford, 1881 accepted as Perrottetia concinnus (W. T. Blanford, 1881)
- Species Streptaxis conoideus L. Pfeiffer, 1855 accepted as Rectartemon conoideus (L. Pfeiffer, 1855)
- Species Streptaxis contusus (A. Férussac, 1821)
- Species Streptaxis cookeana F. Baker, 1914 accepted as Streptartemon cookeanus (F. Baker, 1914)
- Species Streptaxis costulatus Möllendorff, 1881 accepted as Haploptychius costulatus (Möllendorff, 1881)
- Species Streptaxis costulosus (L. Pfeiffer, 1853) accepted as Rectartemon costulosus (L. Pfeiffer, 1853)
- Species Streptaxis craveni E. A. Smith, 1880 accepted as Tayloria craveni (E. A. Smith, 1880)
- Species Streptaxis crossei L. Pfeiffer, 1867 accepted as Smenodonta janeirensis (L. Pfeiffer, 1852)
- Species Streptaxis cumingiana L. Pfeiffer, 1850 accepted as Streptartemon cumingianus (L. Pfeiffer, 1850)
- Species Streptaxis cypsele (L. Pfeiffer, 1849)
- Species Streptaxis dacostae Gude, 1903
- Species Streptaxis daedaleus Bavay & Dautzenberg, 1909 accepted as Perrottetia daedaleus (Bavay & Dautzenberg, 1909)
- Species Streptaxis daflaensis Godwin-Austen, 1876 accepted as Perrottetia daflaensis (Godwin-Austen, 1876)
- Species Streptaxis decipiens Crosse, 1865 accepted as Streptartemon decipiens (Crosse, 1865)
- Species Streptaxis decussatus Pilsbry, 1897
- Species Streptaxis deformis A. Férussac, 1821 accepted as Streptartemon deformis (A. Férussac, 1821)
- Species Streptaxis dejecta Petit de la Saussaye, 1842
- Species Streptaxis denticulatus Dohrn, 1878 accepted as Gonaxis denticulatus (Dohrn, 1878)
- Species Streptaxis deplanata L. Pfeiffer, 1845
- Species Streptaxis deplanchei Drouët, 1859 accepted as Streptartemon deplanchei (Drouët, 1859)
- Species Streptaxis depressus Heynemann, 1868 accepted as Rectartemon depressus (Heynemann, 1868)
- Species Streptaxis deshayesianus Crosse, 1863 accepted as Hypselartemon deshayesianus (Crosse, 1863)
- Species Streptaxis desiderata Preston, 1913 accepted as Tayloria desiderata (Preston, 1913)
- Species Streptaxis diespiter Mabille, 1887 accepted as Haploptychius diespiter (Mabille, 1887)
- Species Streptaxis diplodon Möllendorff, 1900 accepted as Oophana diplodon (Möllendorff, 1900)
- Species Streptaxis discus L. Pfeiffer, 1853 accepted as Discartemon discus (L. Pfeiffer, 1853)
- Species Streptaxis dugasti Morlet, 1892 accepted as Perrottetia dugasti (Morlet, 1892)
- Species Streptaxis dunkeri L. Pfeiffer, 1845
- Species Streptaxis eburnea L. Pfeiffer, 1861 accepted as Indoartemon eburneus (L. Pfeiffer, 1861)
- Species Streptaxis elisa A. Gould, 1856 accepted as Oophana elisa (A. Gould, 1856)
- Species Streptaxis elongatus Fulton, 1899 accepted as Afristreptaxis elongatus (Fulton, 1899)
- Species Streptaxis enneoides E. von Martens, 1878 accepted as Tayloria (Macrogonaxis) enneoides (E. von Martens, 1878)
- Species Streptaxis epistylium (O. F. Müller, 1774)
- Species Streptaxis erythroceros Möllendorff, 1881
- Species Streptaxis exacutus A. Gould, 1856 accepted as Carinartemis exacutus (A. Gould, 1856)
- Species Streptaxis fagoti Mabille, 1887 accepted as Haploptychius fagoti (Mabille, 1887)
- Species Streptaxis fischeri Morlet, 1886 accepted as Haploptychius fischeri (Morlet, 1886)
- Species Streptaxis footei W. T. Blanford & H. F. Blanford, 1861 accepted as Perrottetia footei (W. T. Blanford & H. F. Blanford, 1861)
- Species Streptaxis fortunei L. Pfeiffer, 1855
- Species Streptaxis fuchsianus Gredler, 1881 accepted as Indoartemon fuchsianus (Gredler, 1881)
- Species Streptaxis funcki L. Pfeiffer, 1848 accepted as Rectartemon funcki (L. Pfeiffer, 1848)
- Species Streptaxis gaudioni Dupuis & Putzeys, 1901 accepted as Gonaxis vitreus (Morelet, 1867)
- Species Streptaxis gigas E. A. Smith, 1880 accepted as Tayloria gigas (E. A. Smith, 1880)
- Species Streptaxis giovannalimae (M. A. Lima & T. Cossignani, 2021)
- Species Streptaxis glaber L. Pfeiffer, 1850 accepted as Streptartemon glaber (L. Pfeiffer, 1850)
- Species Streptaxis glabra L. Pfeiffer, 1850 accepted as Streptartemon glaber (L. Pfeiffer, 1850)
- Species Streptaxis gracilis Collett, 1898 accepted as Indoartemon gracilis (Collett, 1898)
- Species Streptaxis gudei Fulton, 1915 accepted as Perrottetia gudei (Fulton, 1915)
- Species Streptaxis gwandaensis Preston, 1912 accepted as Tayloria gwandaensis (Preston, 1912)
- Species Streptaxis hanleyanus Stoliczka, 1871 accepted as Carinartemis sankeyi (W. H. Benson, 1859)
- Species Streptaxis helios Pilsbry, 1897
- Species Streptaxis hylephilus (A. d'Orbigny, 1835)
- Species Streptaxis iheringi (Pilsbry, 1930)
- Species Streptaxis intermedius Albers, 1857
- Species Streptaxis interruptus Suter, 1900 accepted as Scolodonta interrupta (Suter, 1900)
- Species Streptaxis jheringi Thiele, 1927 accepted as Rectartemon iheringi (Thiele, 1927)
- Species Streptaxis johnstoni E. A. Smith, 1899 accepted as Gonaxis johnstoni (E. A. Smith, 1899)
- Species Streptaxis johswichi E. von Martens, 1864 accepted as Panhartemis mouhoti (L. Pfeiffer, 1863)
- Species Streptaxis kibweziensis E. A. Smith, 1894 accepted as Tayloria kibweziensis (E. A. Smith, 1894)
- Species Streptaxis kirkii Dohrn, 1865 accepted as Gonaxis kirkii (Dohrn, 1865)
- Species Streptaxis laevis W. T. Blanford, 1899 accepted as Oophana laevis (W. T. Blanford, 1899)
- Species Streptaxis laevissimus (S. Moricand, 1836)
- Species Streptaxis latior Gude, 1903
- Species Streptaxis layardiana W. H. Benson, 1853 accepted as Indoartemon layardianus (W. H. Benson, 1853)
- Species Streptaxis leirae Salvador, 2018
- Species Streptaxis lemyrei Morlet, 1883 accepted as Discartemon lemyrei (Morlet, 1883)
- Species Streptaxis leonensis L. Pfeiffer, 1859 accepted as Lamelliger troberti (Petit de la Saussaye, 1841)
- Species Streptaxis luetzelburgi A. Weber, 1925
- Species Streptaxis mamboiensis E. A. Smith, 1890 accepted as Gonaxis mamboiensis (E. A. Smith, 1890)
- Species Streptaxis marsabitensis Preston, 1913 accepted as Tayloria marsabitensis (Preston, 1913)
- Species Streptaxis maugerae J. E. Gray, 1837 accepted as Gonaxis maugerae (J. E. Gray, 1837)
- Species Streptaxis megahelix Salvador, 2018
- Species Streptaxis messageri Bavay & Dautzenberg, 1909 accepted as Perrottetia messageri (Bavay & Dautzenberg, 1909)
- Species Streptaxis micans Putzeys, 1899 accepted as Gonaxis micans (Putzeys, 1899)
- Species Streptaxis mirificus Möllendorff, 1894
- Species Streptaxis monroviana accepted as Gonaxis monrovia (Rang, 1831)
- Species Streptaxis mouhoti L. Pfeiffer, 1863 accepted as Panhartemis mouhoti (L. Pfeiffer, 1863)
- Species Streptaxis mozambicensis E. A. Smith, 1880 accepted as Gonaxis mozambicensis (E. A. Smith, 1880)
- Species Streptaxis nautilus P. Sarasin & F. Sarasin, 1899 accepted as Haploptychius nautilus (P. Sarasin & F. Sarasin, 1899)
- Species Streptaxis nobilis J. E. Gray, 1837 accepted as Gonaxis monrovia (Rang, 1831)
- Species Streptaxis normalis Jousseaume, 1889 accepted as Streptartemon glaber normalis (Jousseaume, 1889)
- Species Streptaxis nseudweensis Putzeys, 1899 accepted as Gonaxis nseudweensis (Putzeys, 1899)
- Species Streptaxis obtusus Stoliczka, 1871 accepted as Oophana obtusa (Stoliczka, 1871)
- Species Streptaxis occidentalis Heude, 1885 accepted as Haploptychius occidentalis (Heude, 1885)
- Species Streptaxis oppidulum Bavay & Dautzenberg, 1909 accepted as Perrottetia oppidulum (Bavay & Dautzenberg, 1909)
- Species Streptaxis ordinarius E. A. Smith, 1890 accepted as Gonaxis denticulatus (Dohrn, 1878)
- Species Streptaxis orientalis Heude, 1885
- Species Streptaxis ovata L. Pfeiffer, 1845
- Species Streptaxis pachychilus Möllendorff, 1884 accepted as Haploptychius pachychilus (Möllendorff, 1884)
- Species Streptaxis pachyglottis Möllendorff, 1900 accepted as Oophana pachyglottis (Möllendorff, 1900)
- Species Streptaxis paivana L. Pfeiffer, 1867 accepted as Hypselartemon paivanus (L. Pfeiffer, 1867)
- Species Streptaxis paradiscus Möllendorff, 1900 accepted as Discartemon discus (L. Pfeiffer, 1853)
- Species Streptaxis paulus Gude, 1896 accepted as Perrottetia heudei (Schmacker & O. Boettger, 1891)
- Species Streptaxis pellucens L. Pfeiffer, 1863 accepted as Haploptychius pellucens (L. Pfeiffer, 1863)
- Species Streptaxis percivali Preston, 1913 accepted as Gonaxis percivali (Preston, 1913)
- Species Streptaxis peroteti (Petit de la Saussaye, 1841) accepted as Perrottetia peroteti (Petit de la Saussaye, 1841)
- Species Streptaxis personatus W. T. Blanford, 1881 accepted as Perrottetia personatus (W. T. Blanford, 1881)
- Species Streptaxis petitii (A. Gould, 1843) accepted as Carinartemis petitii (A. Gould, 1844)
- Species Streptaxis pfeifferi Zelebor, 1867 accepted as Haploptychius pfeifferi (Zelebor, 1867)
- Species Streptaxis pilsbryi (Solem, 1956)
- Species Streptaxis planus Fulton, 1899 accepted as Discartemon planus (Fulton, 1899)
- Species Streptaxis pleurostomoides Gude, 1903
- Species Streptaxis plussensis de Morgan, 1885 accepted as Discartemon plussensis (de Morgan, 1885)
- Species Streptaxis politus Fulton, 1899
- Species Streptaxis porrecta L. Pfeiffer, 1863 accepted as Haploptychius porrectus (L. Pfeiffer, 1863)
- Species Streptaxis prestoni Gude, 1903 accepted as Indoartemon prestoni (Gude, 1903)
- Species Streptaxis pronus W. T. Blanford, 1881 accepted as Perrottetia pronus (W. T. Blanford, 1881)
- Species Streptaxis prostrata A. Gould, 1856 accepted as Gonaxis prostratus (L. Pfeiffer, 1856)
- Species Streptaxis pupilla Morelet, 1888 accepted as Gonaxis pupilla (Morelet, 1888)
- Species Streptaxis pusillus E. von Martens, 1897 accepted as Gonaxis pusillus (E. von Martens, 1897)
- Species Streptaxis pyriformis L. Pfeiffer, 1845 accepted as Odontartemon (Perrottetia) pyriformis (L. Pfeiffer, 1845)
- Species Streptaxis ravanae W. T. Blanford, 1899 accepted as Perrottetia ravanae (W. T. Blanford, 1899)
- Species Streptaxis regius Löbbecke, 1881 accepted as Rectartemon regius (Löbbecke, 1881)
- Species Streptaxis roebeleni Möllendorff, 1894 accepted as Discartemon roebeleni (Möllendorff, 1894)
- Species Streptaxis rollandii (Bernardi, 1857)
- Species Streptaxis sankeyanus Stoliczka, 1871 accepted as Carinartemis sankeyi (W. H. Benson, 1859)
- Species Streptaxis sankeyi W. H. Benson, 1859 accepted as Carinartemis sankeyi (W. H. Benson, 1859)
- Species Streptaxis saopaulensis Pilsbry, 1930
- Species Streptaxis scalptus W. T. Blanford, 1899 accepted as Perrottetia scalptus (W. T. Blanford, 1899)
- Species Streptaxis schweitzeri Dohrn, 1878 accepted as Gonaxis schweitzeri (Dohrn, 1878)
- Species Streptaxis siamensis L. Pfeiffer, 1862 accepted as Oophana siamensis (L. Pfeiffer, 1862)
- Species Streptaxis simonianus Heude, 1890 accepted as Perrottetia simoniana (Heude, 1890)
- Species Streptaxis sinensis Gould, 1859 accepted as Haploptychius sinensis (A. Gould, 1859)
- Species Streptaxis sinuosa L. Pfeiffer, 1861 accepted as Haploptychius sinuosa (L. Pfeiffer, 1861)
- Species Streptaxis solidulus Stoliczka, 1871
- Species Streptaxis souleyetiana (Petit de la Saussaye, 1841) accepted as Gonaxis souleyetianus (Petit de la Saussaye, 1841)
- Species Streptaxis striatula Collinge, 1902 accepted as Oophana striatula (Collinge, 1902)
- Species Streptaxis subacutus W. T. Blanford, 1899 accepted as Perrottetia subacutus (W. T. Blanford, 1899)
- Species Streptaxis subregularis R. A. Philippi, 1846
- Species Streptaxis sudanica Preston, 1914 accepted as Gonaxis sudanicus (Preston, 1914)
- Species Streptaxis suturalis E. von Martens, 1859
- Species Streptaxis sykesi Collinge, 1902 accepted as Discartemon sykesi (Collinge, 1902)
- Species Streptaxis theaecola Heude, 1890
- Species Streptaxis thebawi Godwin-Austen, 1888 accepted as Haploptychius thebawi (Godwin-Austen, 1888)
- Species Streptaxis theobaldi W. H. Benson, 1859 accepted as Perrottetia theobaldi (W. H. Benson, 1859)
- Species Streptaxis totostriatus Thiele, 1927
- Species Streptaxis translucidus Dupuis & Putzeys, 1901 accepted as Gonaxis translucidus (Dupuis & Putzeys, 1901)
- Species Streptaxis tridens Möllendorff, 1898 accepted as Indoartemon tridens (Möllendorff, 1898)
- Species Streptaxis tumescens Suter, 1900 accepted as Systrophiella vitrina (J. A. Wagner, 1827)
- Species Streptaxis tumulus Pilsbry, 1897
- Species Streptaxis turbinata Morelet, 1867 accepted as Gonaxis turbinatus (Morelet, 1867)
- Species Streptaxis uberiformis L. Pfeiffer, 1848
- Species Streptaxis ukamica Thiele, 1911 accepted as Gonaxis ukamicus (Thiele, 1911)
- Species Streptaxis urguessensis Preston, 1913 accepted as Tayloria urguessensis (Preston, 1913)
- Species Streptaxis vosseleri Thiele, 1911 accepted as Afristreptaxis vosseleri (Thiele, 1911)
- Species Streptaxis vulcani Thiele, 1911 accepted as Gonaxis vulcani (Thiele, 1911)
- Species Streptaxis watsoni W. T. Blanford & H. F. Blanford, 1860 accepted as Perrottetia watsoni (W. T. Blanford & H. F. Blanford, 1860)
- Species Streptaxis welwitschi Morelet, 1867 accepted as Gonaxis welwitschi (Morelet, 1867)
- Species Streptaxis woodhousei Preston, 1913 accepted as Gonaxis pusillus woodhousei (Preston, 1913)
- Genus Thachia F. Huber, 2018 (1)
- Genus Campolaemus Pilsbry, 1892 (1)
- Genus Goniodomulus Harzhauser & Neubauer, 2016 † (1)
- Genus Huttonella L. Pfeiffer, 1856 accepted as Gulella (Huttonella) L. Pfeiffer, 1856
- Genus Oppenheimiella Pfeffer, 1930 † accepted as Pfefferiola Harzhauser & Neubauer, 2021 †
- Genus Panhartemis Siriboon, 2023 (2)
- Genus Pfefferiola Harzhauser & Neubauer, 2021 † (1)
- Family Streptostelidae Bourguignat, 1890 accepted as Enneinae Bourguignat, 1883
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 625)
- 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