• Nanina (Thalessa) [sic] accepted as Nitor Gude, 1911
• Nanina (Thalessa) kjellerupii Mörch, 1872 (uncertain > taxon inquirendum)
• Purpura (Thalessa) H. Adams & A. Adams, 1853 accepted as Volema Röding, 1798
• Purpura (Thalessa) problematica F. Baker, 1891 accepted as Reishia problematica (F. Baker, 1891)
• Purpura (Thalessa) pseudohippocastanum Dautzenberg, 1929 accepted as Tylothais virgata (Dillwyn, 1817)
• 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)
• Thalessa H. Adams & A. Adams, 1853 accepted as Volema Röding, 1798
• Thalessa aculeata (Deshayes, 1844) accepted as Tylothais aculeata (Deshayes, 1844)
• Thalessa distinguenda (Dunker, 1866) accepted as Tylothais virgata (Dillwyn, 1817)
• Thalessa savignyi (Deshayes, 1844) accepted as Tylothais savignyi (Deshayes, 1844)
• Thalessa tumulosa (Reeve, 1846) accepted as Thaisella tumulosa (Reeve, 1846)
• Thalessa virgata (Dillwyn, 1817) accepted as Tylothais virgata (Dillwyn, 1817)