• Cassidea (Semicassis) Mörch, 1852 accepted as Semicassis Mörch, 1852
• Cassidea (Semicassis) anteniana K. Martin, 1931 † accepted as Semicassis anteniana (K. Martin, 1931) †
• Cassidea (Semicassis) bituminata K. Martin, 1933 † accepted as Galeodea bituminata (K. Martin, 1933)
• Cassidea (Semicassis) brasili Cossmann & Pissarro, 1905 † accepted as Cassis brasili (Cossmann & Pissarro, 1905) †
• Cassidea (Semicassis) maussieri Cossmann, 1923 † accepted as Cassis maussieri (Cossmann, 1923) †
• Cassidea (Semicassis) miolaevigata Sacco, 1890 † accepted as Semicassis saburon (Bruguière, 1792)
• Cassidea (Semicassis) umbgrovei K. Martin, 1931 † accepted as Semicassis umbgrovei (K. Martin, 1931) †
• Cassidea (Semicassis) vandervlerki K. Martin, 1933 † accepted as Semicassis vandervlerki (K. Martin, 1933) † accepted as Echinophoria vandervlerki (K. Martin, 1933) †
• Cassis (Semicassis) Mörch, 1852 accepted as Semicassis Mörch, 1852
• Cassis (Semicassis) brasili (Cossmann & Pissarro, 1905) † represented as Cassis brasili (Cossmann & Pissarro, 1905) †
• Cassis (Semicassis) denseplicata K. Martin, 1916 † accepted as Cypraecassis denseplicata (K. Martin, 1916) †
• Cassis (Semicassis) fortisulcata E. A. Smith, 1904 accepted as Semicassis umbilicata (Pease, 1861)
• Cassis (Semicassis) lagenaeformis O. Boettger, 1883 † (uncertain > unassessed)
• Cassis (Semicassis) rembangensis K. Martin, 1899 † accepted as Phalium rembangensis (K. Martin, 1899) †
• Cassis (Semicassis) shubutensis Aldrich, 1885 † (uncertain > unassessed)
• Cassis (Semicassis) subsulcosa R. Hoernes & Auinger, 1884 † accepted as Semicassis subsulcosa (R. Hoernes & Auinger, 1884) †
• Cassis (Semicassis) tegalensis K. Martin, 1899 † accepted as Linatella caudata (Gmelin, 1791)
• Phalium (Semicassis) Mörch, 1852 accepted as Semicassis Mörch, 1852
• Phalium (Semicassis) bisulcatum (Schubert & J. A. Wagner, 1829) accepted as Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
• Phalium (Semicassis) bisulcatum bisulcatum (Schubert & J. A. Wagner, 1829) accepted as Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
• Phalium (Semicassis) louella Squires & Advocate, 1986 † accepted as Galeodea louella (Squires & Advocate), 1986 †
• Phalium (Semicassis) pila (Reeve, 1848) accepted as Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
• Phalium (Semicassis) reklawensis Garvie, 1996 † accepted as Semicassis reklawensis (Garvie, 1996) †
• Phalium (Semicassis) undulatum (Gmelin, 1791) accepted as Semicassis undulata (Gmelin, 1791)
• Phalium (Semicassis) undulatum var. marchesei Bayer, 1935 accepted as Semicassis undulata (Gmelin, 1791)
• Phalium (Semicassis) undulatum var. pusio Bayer, 1935 accepted as Semicassis undulata (Gmelin, 1791)
• Phalium (Semicassis) vector Abbott, 1993 accepted as Semicassis bondarevi Mühlhäusser & Parth, 1993
• Semicassis Mörch, 1852
• Semicassis (Antephalium) Iredale, 1927 accepted as Antephalium Iredale, 1927
• Semicassis (Antephalium) adcocki (G. B. Sowerby III, 1896) accepted as Semicassis adcocki (G. B. Sowerby III, 1896) accepted as Antephalium adcocki (G. B. Sowerby III, 1896)
• Semicassis (Antephalium) semigranosa (Lamarck, 1822) represented as Semicassis semigranosa (Lamarck, 1822) accepted as Antephalium semigranosum (Lamarck, 1822)
• Semicassis (Antephalium) sinuosa (Verco, 1904) represented as Semicassis sinuosa (Verco, 1904)
• Semicassis (Antephalium) sufflata (Tenison Woods, 1877) † accepted as Antephalium sufflatum (Tenison Woods, 1877) †
• Semicassis (Casmaria) H. Adams & A. Adams, 1853 accepted as Casmaria H. Adams & A. Adams, 1853
• Semicassis (Kahua) Marwick, 1928 † represented as Semicassis Mörch, 1852
• Semicassis (Kahua) fibrata (P. Marshall & Murdoch, 1920) † represented as Semicassis fibrata (P. Marshall & Murdoch, 1920) †
• Semicassis (Kahua) kaawaensis (Bartrum & A. W. B. Powell, 1928) † represented as Semicassis kaawaensis (Bartrum & A. W. B. Powell, 1928) †
• Semicassis (Kahua) lilliei (C. A. Fleming, 1943) † represented as Semicassis lilliei (C. A. Fleming, 1943) †
• Semicassis (Kahua) marwicki (C. A. Fleming, 1943) † represented as Semicassis marwicki (C. A. Fleming, 1943) †
• Semicassis (Kahua) skinneri (Marwick, 1928) † represented as Semicassis skinneri (Marwick, 1928) †
• Semicassis (Semicassis) Mörch, 1852 represented as Semicassis Mörch, 1852
• Semicassis (Semicassis) angasi (Iredale, 1927) represented as Semicassis angasi (Iredale, 1927)
• Semicassis (Semicassis) bisulcata (Schubert & J. A. Wagner, 1829) represented as Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
• Semicassis (Semicassis) bondarevi Mühlhäusser & Parth, 1993 represented as Semicassis bondarevi Mühlhäusser & Parth, 1993
• Semicassis (Semicassis) bulla T. Habe, 1961 represented as Semicassis bulla T. Habe, 1961
• Semicassis (Semicassis) canaliculata (Bruguière, 1792) represented as Semicassis canaliculata (Bruguière, 1792)
• Semicassis (Semicassis) centiquadrata (Valenciennes, 1832) represented as Semicassis centiquadrata (Valenciennes, 1832)
• Semicassis (Semicassis) craticulata (Euthyme, 1885) represented as Semicassis craticulata (Euthyme, 1885)
• Semicassis (Semicassis) decipiens (Kilburn, 1980) represented as Semicassis decipiens (Kilburn, 1980)
• Semicassis (Semicassis) dorae (Kreipl & Mühlhäusser, 1996) represented as Semicassis dorae (Kreipl & Mühlhäusser, 1996)
• Semicassis (Semicassis) faurotis (Jousseaume, 1888) represented as Semicassis faurotis (Jousseaume, 1888)
• Semicassis (Semicassis) fernandesi (Kilburn, 1975) represented as Semicassis fernandesi (Kilburn, 1975)
• Semicassis (Semicassis) glabrata (Dunker, 1852) represented as Semicassis glabrata (Dunker, 1852)
• Semicassis (Semicassis) granulata (Born, 1778) represented as Semicassis granulata (Born, 1778)
• Semicassis (Semicassis) granulata granulata (Born, 1778) accepted as Semicassis granulata (Born, 1778)
• Semicassis (Semicassis) inornata (Pilsbry, 1895) represented as Semicassis inornata (Pilsbry, 1895)
• Semicassis (Semicassis) labiata (G. Perry, 1811) represented as Semicassis labiata (G. Perry, 1811)
• Semicassis (Semicassis) microstoma (E. von Martens, 1904) represented as Semicassis microstoma (E. von Martens, 1904)
• Semicassis (Semicassis) paucirugis (Menke, 1843) represented as Semicassis paucirugis (Menke, 1843)
• Semicassis (Semicassis) pyrum (Lamarck, 1822) represented as Semicassis pyrum (Lamarck, 1822)
• Semicassis (Semicassis) royana (Iredale, 1914) represented as Semicassis royana (Iredale, 1914)
• Semicassis (Semicassis) saburon (Bruguière, 1792) represented as Semicassis saburon (Bruguière, 1792)
• Semicassis (Semicassis) salmonea Beu, Bouchet & Tröndlé, 2012 accepted as Semicassis bulla T. Habe, 1961
• Semicassis (Semicassis) sophia (Brazier, 1872) represented as Semicassis sophia (Brazier, 1872)
• Semicassis (Semicassis) thachi Kreipl, Alf & Eggeling, 2006 represented as Semicassis thachi Kreipl, Alf & Eggeling, 2006
• Semicassis (Semicassis) thomsoni (Brazier, 1876) represented as Semicassis thomsoni (Brazier, 1876)
• Semicassis (Semicassis) umbilicata (Pease, 1861) represented as Semicassis umbilicata (Pease, 1861)
• Semicassis (Semicassis) undulata (Gmelin, 1791) represented as Semicassis undulata (Gmelin, 1791)
• Semicassis (Semicassis) vavakuana Ladd, 1934 † accepted as Phalium areola (Linnaeus, 1758)
• Semicassis (Semicassis) westralis Kreipl, 1997 represented as Semicassis westralis Kreipl, 1997
• Semicassis (Semicassis) whitworthi (Abbott, 1968) accepted as Semicassis whitworthi (Abbott, 1968)
• Semicassis (Semicassis) zeylanica (Lamarck, 1822) represented as Semicassis zeylanica (Lamarck, 1822)
• Semicassis (Tylocassis) Woodring, 1928 accepted as Semicassis Mörch, 1852
• Semicassis (Xenophalium) Iredale, 1927 accepted as Semicassis (Semicassis) Mörch, 1852 represented as Semicassis Mörch, 1852
• Semicassis (Xenophalium) inornata (Pilsbry, 1895) accepted as Semicassis (Semicassis) inornata (Pilsbry, 1895) represented as Semicassis inornata (Pilsbry, 1895)
• Semicassis (Xenophalium) inornata debiae Goodwin, 2008 accepted as Semicassis inornata (Pilsbry, 1895)
• Semicassis adcocki (G. B. Sowerby III, 1896) accepted as Antephalium adcocki (G. B. Sowerby III, 1896)
• Semicassis aldrichi (Dall, 1890) †
• Semicassis anceps A. Adams, 1853 (uncertain > taxon inquirendum)
• Semicassis angasi (Iredale, 1927)
• Semicassis anteniana (K. Martin, 1931) †
• Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
• Semicassis bisulcata booleyi (G. B. Sowerby III, 1900) accepted as Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
• Semicassis bisulcata f. diuturna Iredale, 1927 accepted as Semicassis diuturna Iredale, 1927
• Semicassis bisulcata f. japonica (Reeve, 1848) accepted as Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
• Semicassis bisulcata persimilis Kira, 1955 accepted as Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
• Semicassis bondarevi Mühlhäusser & Parth, 1993
• Semicassis bulla T. Habe, 1961
• Semicassis bulla bulla T. Habe, 1961 accepted as Semicassis bulla T. Habe, 1961
• Semicassis bulla fernandesi (Kilburn, 1975) accepted as Semicassis fernandesi (Kilburn, 1975)
• Semicassis canaliculata (Bruguière, 1792)
• Semicassis centiquadrata (Valenciennes, 1832)
• Semicassis cicatricosa (Gmelin, 1791) accepted as Semicassis granulata (Born, 1778)
• Semicassis cicatricosa peristephes Pilsbry & T. L. McGinty, 1939 accepted as Semicassis granulata (Born, 1778)
• Semicassis craticulata (Euthyme, 1885)
• Semicassis decipiens (Kilburn, 1980)
• Semicassis delibrata (Moroni, 1966) †
• Semicassis diuturna Iredale, 1927
• Semicassis dorae (Kreipl & Mühlhäusser, 1996)
• Semicassis dougthorni Dekkers, 2013