LOCALITY:
Gobi Desert, Southwestern Peoples' Republic of Mongolia
AGE:
Early Cretaceous (Aptian-Albian), Barunbayan Formation,
100-125 million years ago
SIZE:
Not more than 2 metres m length
MEANING OF NAME:
'Parrot reptile'
PRONUNCIATION:
pseh-tack-a-SAWR-us
CLASSlFICATION:
CERATOPSIA: Psittacosauridae
This dinosaur which spent most of its
time standing on its two hind legs is thought to have
been near the ancestry of the horned dinosaurs
(neoceratopsians), which include such well known forms as
Triceratops.
The generic name for this dinosaur, Psittacosaurus,
means the 'parrot-like lizard' in reference to its
prominent parrot-like beak. This feature was one of the
principal advances of this form from the generalised
bipedal fabrosaurids and hypsilophodontids that gave rise
to it.
Psittacosaurus was the first
step on the path towards the four-footed, horned
descendants that were to appear more than twenty millions
years later. It had a special bone called the rostral,
found in the horned dinosaurs, even though in many ways,
such as in the construction of its teeth, it is still
very similar to hypsilophodonts in a way.
Psittacosaurus is a missing link
between two large groups of
dinosaurs!
Psittacosaurus was one of the
most common dinosaurs in the Early Cretaceous collections
from Mongolia sometimes making up over 90% of all the
dinosaur bones found, most frequently in lake and stream
deposits.
Psittacosaurus was a plant eater
with leaf-shaped teeth that sliced past one another like
the blades of scissors. It must have grabbed plants with
its parrot-like beak, chopped them up, and then smashed
them up with gizzard stones, which have been found inside
the body cavity of some skeletons of this little
dinosaur.
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