Baryonyx was a fish eating dinosaur . Baryonyx ("heavy claw") is a large, carnivorous dinosaur exposed in clay pits just south of Dorking, England. It is known from a single, young specimen, and apparently ate fish because remains of its last meal were discovered fossilized in its ribcage. It has been dated to the Barremian period of Early Cretaceous, approximately 125 million years ago.

Description Edit

Baryonyx is a very strange tetanuran. The design of its hips and pelvis suggests that it was bipedal for the purposes of on foot from place to place. However, its forelimbs were absurdly large for a theropod, telling that it also spent much of its time on all fours.

Like the dromaeosaurids, the person had a long curved claw on the thumb of each hand, which deliberates at about 31 cm (12 in). However, instead of having them on the rear foot, it is supposed that Baryonyx had them on the frontage feet.

The skeleton was not accepted exactly as it would have been in life (articulated), so the paleontologists reconstructing it placed them on the front feet because these legs were so powerful. The bone structure suggests a huge bulk of muscle ran down the sides of these front legs, and it therefore seems probable that the claws were placed here.

The long neck was fairly rigid, and was not S-shaped as in many other theropods. The skull was set at an sharp


angle, not the 90° angle common in similar dinosaurs. The long jaw was distinctly crocodilian, and had 96 teeth, twice as many as its relations. Sixty-four of the teeth were located in the lower jaw (mandible), and 32 large ones in the upper (maxilla). The snout almost certainly bore a small crest.


The crocodile-like jaws and huge number of finely serrated teeth suggested to scientists that Baryonyx was a fish-eater. As verification, a number of scales and bones from the fish Lepidotes were also discovered in the body cavity.

It is speculated that Baryonyx would sit on a riverbank, sleeping on its powerful front legs, and then sweep fish from the river with its powerful striking claw. This is similar to the modern grizzly bear. The long but low posture and angled head support this theory.

Until the discovery of the closely-related Suchomimus , Baryonyx was the only known piscivorous (fish-eating) dinosaur. On the other hand, bones of an Iguanodon were also found in organization with the Baryonyx skeleton. Although not definitive proof, it seems possible that Baryonyx scavenged any extra meat it could find.

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