Prowling through the coastal swamps of the Jurassic Period was the carnivorous predator Dubreuillosaurus. Like its relative Spinosaurus, it may have been a fish hunter that specialized in snatching slippery prey from shallow waters with its pointed, fang-filled snout.
■ When: 170 million years ago (Middle Jurassic)
■ Fossil location: France
■ Habitat: Mangrove swamps
■ Length: 20 ft (6 m)
■ Diet: Fish and other marine animals
Little is known about Dubreuillosaurus, since only a single partial skeleton has been found. It had an unusually long and shallow skull, which was three times as long as it was deep. The skull did not have any distinct crests or horns, like those seen on other dinosaur skulls, but since the only known specimen is a young Dubreuillosaurus, these structures may have developed in adults.
Dubreuillosaurus was named in 2002 and was originally thought to be a new species of Poekilopleuron, a large allosaur-like theropod. Later study of its hollow skull showed Dubreuillosaurus was more closely related to the megalosaurids. Like its relatives, it probably had short, powerful arms with three fingered hands, heavily muscled legs, and a stiff tail that it held out for balance.