Lampriformes is an order of ray-finned fishes. Members are commonly known as lampriforms, and include such open-ocean and partially deep-sea Teleostei as the opahs, sailfin velifer, crestfishes, ribbonfishes and oarfishes. A synonym for this order is Allotriognathi, while an often-seen spelling variant is Lampridiformes. They contain seven extant families which are generally small but highly distinct, and a mere 12 lampriform genera with some 20 species altogether are recognized. They are the only extant members of the superorder Lamprimorpha, which was formerly diverse throughout much of the Late Cretaceous.