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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Dilophosaurus
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Dilophosaurus
TIME: Early Jurassic
LOCALITY: North America (Arizona)
SIZE: 20 ft/6 m long
First discovered in 1942 by an expedition
from the University of California,
Dilophosaurus had the typical ceratosaur
features of a long, slender neck, tail and
arms, but had a rather heavy head, more like
that of a carnosaur.The skull of
Dilophosaurus was unusual for any group. A
pair of semicircular, bony crests rose
vertically on either side of the skull.
Although wafer thin in places, they were
strengthened by vertical struts of bone. At
the back of the head, the tip of each crest
narrowed into a spike.The function of these
head crests remains a mystery. They have
never been found actually attached to the
skull, but lying nearby, so there is a
certain amount of educated guesswork about
their position in life. Some paleontologists
think that they could have been sexual
display structures, and that only the males
had them--a theory supported by the fact that
not all specimens found had the crests.
Indeed, there were none on the first few
skeletons unearthed, and the animals were
thought to have been a species of
Megalosaurus.The jaws of Dilophosaurus give a
clue to its lifestyle. The lower jaw was
strong and full of long, sharp, thin teeth.
The upper jaw had a cluster of teeth at the
front, separate from the rest of the
teeth--rather like the arrangement in the
jaws of a modern crocodile.So, although
Dilophosaurus had a large head and strong
jaws, it probably did not kill its victims by
biting them; the thin teeth and delicate head
crests would have been too vulnerable in a
fight. More likely, this dinosaur caught and
ripped its prey with the clawed feet and
hands. Or, like many of its relatives, it
could have fed on the corpses of creatures
killed by stronger carnosaurs.
Subject by: Russell Webb