body plan, but are known to be very distantly related to actual billfish; these genera may have instead served as a Cretaceous ecological analogue to billfish.

Species

The term billfish refers to the fishes of the families Xiphiidae and Istiophoridae. These large fishes are "characterized by the prolongation of the upper jaw, much beyond the lower jaw into a long rostrum which is flat and sword-like (swordfish) or rounded and spear-like (sailfishes, spearfishes, and marlins)."

True billfish

The 12 species of

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