Carenzia carinata (Jeffreys, 1877)
Carenzia marismontis Hoffman, Gofas & Freiwald, 2020
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 elegans Jeffreys, 1885
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 tricarinata Jeffreys, 1885 accepted as Haloceras tricarinatum (Jeffreys, 1885)