Kamag-anak ng dinosaur na nabubuhay pa hanggang ngayon.
Lizard, turtles, alligator at explanation kung bakit kasama sya sa family ng dinosaur
Land form
"Lizard-Hipped" dinosaurs (Saurischians) had a hip
structure similar to that of lizards. Oddly enough, these
"Lizard-Hipped" dinosaurs were the ancestors of the birds.
Other anatomical features that characterize saurischians
include an opening below the nostrils (called the subnarial foramen), an
elongation on some neck vertebrae (resulting in long necks), a big thumb, an
extra, wedge-shaped ankle bone (the astragalus), and many other distinctive
features.
Saurischians included both meat and plant eaters.
Paleontologists still
haven't identified the exact family of prehistoric reptiles that spawned modern
turtles and tortoises, but they do
know one thing: it wasn't the placodonts. Lately, the bulk of the evidence
points to an ancestral role for Eunotosaurus, a late Permian reptile whose
wide, elongated ribs curved over its back (a striking adumbration of the hard
shells of later turtles). Eunotosaurus itself seems to have been a pareiasaur,
an obscure family of ancient reptiles the most notable member of which was the
(completely unshelled) Scutosaurus.
The basic Crocodylia body form has been around for more than
180 million years, making alligators
and crocodiles living dinosaurs.
They share cold-blooded circulations that rely on the environment to heat and
cool. Physical similarities, such as their rubbery skin and fierce teeth and
claws are also apparent.
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