Prosauropods first appeared during the later part of
remained successful into the early
but became extinct by the
This infraorder was once thought to be ancestral to
(hence the name "Prosauropoda", which means
but today they are considered to be a parallel sister-lineage.
Prosauropods were herbivores (plant-eaters). They had a long neck and small head.
Their forelimbs were equipped with a thumb claw (probably used for defense),
and were shorter than their hind limbs.
Most species were semi-bipedal (able to talk on two legs at least some of
the time), but some Prosauropods like
were fully quadrupedal (walking on four legs).
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