Fusus is a genus of small to large sea snails, marine gastropod molluscs in the family Fasciolariidae, the spindle snails and tulip snails. Fusus as a name for a genus of gastropods has confusingly been used three times. These names are, in whatever taxonomical sense, now invalid. This page is kept for historical reasons. The name of the genus Fusus Bruguière, 1789 is invalid as it is a junior homonym of Fusus Helbling, 1779. (Placed by the ICZN on the Official Index by Opinion 1765, 1994, Bulletin of Zoological Nomenclature, 51(2): 159). The accepted name is Fusinus Rafinesque, 1815