• Carenzia carinata (Jeffreys, 1877)
• Carenzia marismontis L. Hoffman, Gofas & Freiwald, 2020
• Quinnia cazioti (Dautzenberg, 1925)
• Quinnia ionica (R. B. Watson, 1878)
• Seguenzia carinata Jeffreys, 1877 accepted as Carenzia carinata (Jeffreys, 1877)
• Seguenzia carinata var. attenuata Locard, 1898 accepted as Carenzia carinata (Jeffreys, 1877)
• Seguenzia cazioti Dautzenberg, 1925 accepted as Quinnia cazioti (Dautzenberg, 1925)
• Seguenzia elegans Jeffreys, 1885
• Seguenzia eritima A. E. Verrill, 1884
• Seguenzia formosa Jeffreys, 1876
• Seguenzia ionica R. B. Watson, 1878 accepted as Quinnia ionica (R. B. Watson, 1878)
• Seguenzia laxa Jeffreys, 1885 accepted as Haloceras laxa (Jeffreys, 1885) accepted as Haloceras laxum (Jeffreys, 1885)
• Seguenzia monocingulata G. Seguenza, 1876 †
• Seguenzia nitida A. E. Verrill, 1884
• Seguenzia tricarinata Jeffreys, 1885 accepted as Haloceras tricarinatum (Jeffreys, 1885)