Onchopristis size guide
Onchopristis is a very large species sawfish from early to late Cretaceous. The species fossils found in various places that concluded its habitat, like North America, North Africa, Brazil, and New Zealand. [1]

This species of prehistoric sawfish estimated to be around 8.5 to 10 meters long and, to be weighted around 1.5 tonnes. The Onchopristis, has been speculated to be, one of the potential food sources for the Massive carnivorous theropod Spinosaurus Aegypticus. They are the presumed Relatives to the modern sawfish species and were noticably bigger than a White Shark. They lived in freshwaters and rivers. This animals were also the predators of their domain, likely feeding on any animal that they could hunt, similiar to modern species of sawfish, that are predators that feed


A reconstruction; notice the animal's large size

on fish, crustaceans and molluscs. This species of fish speculatively had electroreceptors, presumably to detect food, like most modern sharks and some rays. Onchopristis may have raked through the riverbed to find and then eat potential prey animals.


The rostrum, or snout, was around 2.5 meters (8.2 feet) long, lined with barbed teeth. In the type species, O. numidus, each tooth had one barb, but in O. dunklei there were two to five barbs on each tooth, and two to three in O. d. praecursor. This sawfish was 8 to 10 meters long.


As with modern sawfish, Onchopristis's eyes were on top of its head, potentially to spot possible predators; and its mouth and gills were under its body.

In popular culture

  • Onchopristis and spinosaurus

    This car sized, multiton fish is, speculated to be a potential food source for Spinosaurus, however, it is uncertain.

    Onchopristis appeared in the documentary series called Planet Dinosaur.
  • Onchopristis appeared in the documentary Bigger Than T-Rex.
  • Onchopristis appeared in the video game Jurassic World: The Game.




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