• Thais Röding, 1798
• Thais (Mancinella) Link, 1807 accepted as Mancinella Link, 1807
• Thais (Mancinella) alouina (Röding, 1798) accepted as Mancinella alouina (Röding, 1798)
• Thais (Mancinella) echinata (Blainville, 1832) accepted as Mancinella echinata (Blainville, 1832)
• Thais (Mancinella) echinulata (Lamarck, 1822) accepted as Mancinella echinulata (Lamarck, 1822)
• Thais (Mancinella) grossa Houart, 2001 accepted as Mancinella grossa (Houart, 2001)
• Thais (Mancinella) herberti Houart, 1998 accepted as Mancinella herberti (Houart, 1998)
• Thais (Mancinella) lata Kuroda, 1931 accepted as Mancinella lata (Kuroda, 1931)
• Thais (Mancinella) mancinella (Linnaeus, 1758) accepted as Mancinella alouina (Röding, 1798)
• Thais (Mancinella) marmorata (Pease, 1865) accepted as Mancinella marmorata (Pease, 1865)
• Thais (Mancinella) siro Kuroda, 1931 accepted as Mancinella siro (Kuroda, 1931)
• Thais (Neorapana) A. H. Cooke, 1918 accepted as Neorapana A. H. Cooke, 1918
• Thais (Neorapana) grandis (G. B. Sowerby I, 1835) represented as Neorapana grandis (G. B. Sowerby I, 1835)
• Thais (Neorapana) muricata (Broderip, 1832) represented as Neorapana muricata (Broderip, 1832)
• Thais (Neorapana) tuberculata (G. B. Sowerby I, 1835) represented as Neorapana tuberculata (G. B. Sowerby I, 1835)
• Thais (Nucella) Röding, 1798 accepted as Nucella Röding, 1798
• Thais (Nucella) freycinetii (Deshayes, 1839) accepted as Nucella freycinetii (Deshayes, 1839)
• Thais (Nucella) lima (Gmelin, 1791) accepted as Nucella lima (Gmelin, 1791)
• Thais (Nucella) tuberculatus Alekseev, 1955 † (uncertain > taxon inquirendum)
• Thais (Pinaxia) H. Adams & A. Adams, 1853 accepted as Pinaxia H. Adams & A. Adams, 1853
• Thais (Pinaxia) adamsi Dall, 1909 accepted as Pinaxia coronata A. Adams, 1851
• Thais (Polytropa) Swainson, 1840 accepted as Nucella Röding, 1798
• Thais (Polytropa) lapillus (Linnaeus, 1758) accepted as Nucella lapillus (Linnaeus, 1758)
• Thais (Reishia) Kuroda & Habe, 1971 accepted as Reishia Kuroda & Habe, 1971
• Thais (Reishia) pseudodiadema (Yokoyama, 1928) accepted as Thais pseudodiadema (Yokoyama, 1928)
• Thais (Semiricinula) E. von Martens, 1879 accepted as Semiricinula E. von Martens, 1879
• Thais (Semiricinula) hadrolineae Houart, 1996 accepted as Semiricinula hadrolineae (Houart, 1996)
• Thais (Semiricinula) marginatra (Blainville, 1832) accepted as Neothais marginatra (Blainville, 1832)
• Thais (Stramonita) Schumacher, 1817 accepted as Stramonita Schumacher, 1817
• Thais (Stramonita) berryi Olsson, 1932 † (uncertain > unassessed)
• Thais (Stramonita) dayunensis Z.-Y. Chen & Z.-J. You, 2009 accepted as Stramonita dayunensis (Z.-Y. Chen & Z.-J. You, 2009)
• Thais (Stramonita) hidalgoi Coen, 1946 accepted as Thais hidalgoi Coen, 1946 accepted as Stramonita haemastoma (Linnaeus, 1767)
• Thais (Stramonita) kiosquiformis (Duclos, 1832) accepted as Thaisella kiosquiformis (Duclos, 1832)
• Thais (Stramonita) spinosa Kojumdgieva, 1960 † accepted as Janssenia spinosa (Kojumdgieva, 1960) †
• Thais (Thais) Röding, 1798 accepted as Thais Röding, 1798
• Thais (Thais) aperta Blainville, 1832 accepted as Drupa aperta (Blainville, 1832) accepted as Amplidrupa aperta (Blainville, 1832)
• Thais (Thais) bimaculata (Jonas, 1845) accepted as Menathais bimaculata (Jonas, 1845)
• Thais (Thais) callaoensis (J. E. Gray, 1828) accepted as Penethais callaoensis (J. E. Gray, 1828)
• Thais (Thais) nodosa (Linnaeus, 1758) accepted as Thais nodosa (Linnaeus, 1758)
• Thais (Thais) speciosa (Valenciennes, 1832) accepted as Vasula speciosa (Valenciennes, 1832)
• Thais (Thais) triangularis (Blainville, 1832) accepted as Penethais triangularis (Blainville, 1832)
• Thais (Thaisella) Clench, 1947 accepted as Thaisella Clench, 1947
• Thais (Thaisella) blanfordi (Melvill, 1893) accepted as Indothais blanfordi (Melvill, 1893)
• Thais (Thaisella) callifera (Lamarck, 1822) accepted as Thaisella callifera (Lamarck, 1822)
• Thais (Thaisella) coronata (Lamarck, 1816) accepted as Thaisella coronata (Lamarck, 1816)
• Thais (Thaisella) dubia (Schepman, 1919) accepted as Indothais dubia (Schepman, 1919)
• Thais (Thaisella) gradata (Jonas, 1846) accepted as Indothais gradata (Jonas, 1846)
• Thais (Thaisella) javanica (R. A. Philippi, 1848) accepted as Indothais javanica (R. A. Philippi, 1848)
• Thais (Thaisella) jubilaea K. S. Tan & Sigurdsson, 1990 accepted as Reishia jubilaea (K. S. Tan & Sigurdsson, 1990) accepted as Reishia luteostoma (Holten, 1802)
• Thais (Thaisella) keluo K.-S. Tan & L.-L. Liu, 2001 accepted as Reishia keluo (K.-S. Tan & L.-L. Liu, 2001)
• Thais (Thaisella) kiosquiformis (Duclos, 1832) accepted as Thaisella kiosquiformis (Duclos, 1832)
• Thais (Thaisella) lacera (Born, 1778) accepted as Indothais lacera (Born, 1778)
• Thais (Thaisella) langi Clench & R. D. Turner, 1948 accepted as Thaisella forbesii (Dunker, 1853)
• Thais (Thaisella) luteostoma (Holten, 1802) accepted as Reishia luteostoma (Holten, 1802)
• Thais (Thaisella) malayensis K. S. Tan & Sigurdsson, 1996 accepted as Indothais malayensis (K. S. Tan & Sigurdsson, 1996)
• Thais (Thaisella) mariae Lange de Morretes, 1954 accepted as Thaisella mariae (Lange de Morretes, 1954)
• Thais (Thaisella) mutabilis (Link, 1807) accepted as Indothais lacera (Born, 1778)
• Thais (Thaisella) pinangensis K. S. Tan & Sigurdsson, 1996 accepted as Indothais pinangensis (K. S. Tan & Sigurdsson, 1996)
• Thais (Thaisella) rufotincta K. S. Tan & Sigurdsson, 1996 accepted as Indothais rufotincta (K. S. Tan & Sigurdsson, 1996)
• Thais (Thaisella) sacellum (Gmelin, 1791) accepted as Indothais sacellum (Gmelin, 1791)
• Thais (Thaisella) tissoti (Petit de la Saussaye, 1852) accepted as Semiricinula tissoti (Petit de la Saussaye, 1852)
• Thais (Thaisella) wutingi K. S. Tan, 1997 accepted as Indothais wutingi (K. S. Tan, 1997)
• Thais (Thalessa) H. Adams & A. Adams, 1853 accepted as Volema Röding, 1798
• Thais (Thalessa) aculeata (Deshayes, 1844) accepted as Thalessa aculeata (Deshayes, 1844) accepted as Tylothais aculeata (Deshayes, 1844)
• Thais (Thalessa) bitubercularis (Lamarck, 1822) accepted as Reishia bitubercularis (Lamarck, 1822)
• Thais (Thalessa) deltoidea (Lamarck, 1822) accepted as Vasula deltoidea (Lamarck, 1822)
• Thais (Thalessa) intermedia (Kiener, 1835) accepted as Menathais intermedia (Kiener, 1835)
• Thais (Thalessa) savignyi (Deshayes, 1844) accepted as Thalessa savignyi (Deshayes, 1844) accepted as Tylothais savignyi (Deshayes, 1844)
• Thais (Thalessa) tuberosa (Röding, 1798) accepted as Menathais tuberosa (Röding, 1798)
• Thais (Thalessa) tumulosa (Reeve, 1846) accepted as Thalessa tumulosa (Reeve, 1846) accepted as Thaisella tumulosa (Reeve, 1846)
• Thais (Thalessa) virgata (Dillwyn, 1817) accepted as Tylothais virgata (Dillwyn, 1817)
• Thais (Tribulus) H. Adams & A. Adams, 1853 accepted as Tribulus H. Adams & A. Adams, 1853
• Thais (Tribulus) planospira (Lamarck, 1822) accepted as Tribulus planospira (Lamarck, 1822)
• Thais (Vasula) Mörch, 1860 accepted as Vasula Mörch, 1860
• Thais (Vasula) melones (Duclos, 1832) accepted as Vasula melones (Duclos, 1832)
• Thais aculeata (Deshayes, 1844) accepted as Thalessa aculeata (Deshayes, 1844) accepted as Tylothais aculeata (Deshayes, 1844)
• Thais albolineata W. H. Turton, 1932 accepted as Thais capensis (Petit de la Saussaye, 1852) accepted as Mancinella capensis (Petit de la Saussaye, 1852)
• Thais alouina (Röding, 1798) accepted as Mancinella alouina (Röding, 1798)
• Thais alveolata (Reeve, 1846) accepted as Drupella rugosa (Born, 1778)
• Thais ambustulata Hedley, 1912
• Thais armigera (Link, 1807) accepted as Mancinella armigera Link, 1807
• Thais biserialis (Blainville, 1832) accepted as Stramonita biserialis (Blainville, 1832)
• Thais bitubercularis (Lamarck, 1822) accepted as Reishia bitubercularis (Lamarck, 1822)
• Thais brevicula Vermeij, 2001 † accepted as Penethais brevicula (Vermeij, 2001) †
• Thais bronni (Dunker, 1860) accepted as Reishia bronni (Dunker, 1860) accepted as Reishia luteostoma (Holten, 1802)
• Thais brujensis M. Smith, 1946 accepted as Thais (Thaisella) coronata (Lamarck, 1816) accepted as Thaisella coronata (Lamarck, 1816)
• Thais buccinea (Deshayes, 1844) accepted as Taurasia striata (Blainville, 1832)
• Thais bufo (Lamarck, 1822) accepted as Purpura bufo Lamarck, 1822
• Thais calcarata (Grateloup, 1834) † accepted as Janssenia calcarata (Grateloup, 1834) †
• Thais callaoensis (J. E. Gray, 1828) accepted as Penethais callaoensis (J. E. Gray, 1828)
• Thais canaliculata Gray, 1839 accepted as Stramonita canaliculata (Gray, 1839)
• Thais canaliculata var. compressa Dall, 1915 accepted as Nucella canaliculata (Duclos, 1832)
• Thais capensis (Petit de la Saussaye, 1852) accepted as Mancinella capensis (Petit de la Saussaye, 1852)
• Thais carinifera (Lamarck, 1822) accepted as Indothais lacera (Born, 1778)
• Thais castanea (Küster, 1859) accepted as Orania castanea (Küster, 1859)
• Thais chaidea (Duclos, 1832) accepted as Oppomorus noduliferus (Menke, 1829)
• Thais chocolata (Duclos, 1832) accepted as Thaisella chocolata (Duclos, 1832)
• Thais cingulata (Linnaeus, 1771) accepted as Trochia cingulata (Linnaeus, 1771)
• Thais clavigera (Küster, 1860) accepted as Reishia clavigera (Küster, 1860)
• Thais cornus (Röding, 1798) accepted as Drupella cornus (Röding, 1798)