Large Cretaceous Giant Sawfish (Onchopristis) Tooth

Here is a very large tooth of the giant 90 million year old sawfish, Onchopristis numidus. It comes from the Tegana Formation in the Kem Kem Basin of Morocco which also produces any teeth of it's key predator Spinosaurus.

This tooth is in overall great shape and displays the classic "barbed hook" shape. There are a couple of hairline breaks that have been repaired but they don't distract from this very impressive specimen.

Onchopristis, or “giant saw”, is a genus of extinct giant sawskate that lived during the Upper Cretaceous in what is now North Africa. It had a long, hard, shovel-shaped snout called a rostrum. The saw-like rostrum, lined on both sides with modified tooth-like structures with hooks and barbs called denticles. Onchopristis used its intimidating, 2-meter long rostrum to unearth crustaceans at the bottom of shallow waters like sawfish do today.

With the modern sawfish, the rostrum is covered with electrosensitive pores that allow the sawfish to detect slight movements of prey hiding in the muddy sea floor. The rostrum also serves as a digging tool. Should suitable prey try to swim past, the normally lethargic sawfish springs from the bottom and slashes at it with its saw. Sawfish also defend themselves with their rostrum against intruding predators such as sharks.

The bizarre-looking Onchopristis were frequently torn apart by Spinosaurus when this enormous ray traveled up freshwater streams to breed and lay eggs. Onchopristis probably lived in schools. Crocodiles, Spinosaurus and other fish-eating theropods would have feasted on the 8-meter long rays.
Onchopristis numidus
Taouz, Kem Kem Basin, Morocco
Tegana Formation
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