The Prosauropoda dinosaurs
were a infraorder of the the
Saurischian
dinosaurs.
Together with the
Sauropods,
they form the Sauropodomorpha suborder of
Saurischia.
Some of the better-known Prosauropod dinosaurs include
Massospondylus and
Plateosaurus
Prosauropods first appeared during the later part of
Triassic period,
remained successful into the early
Jurassic period,
but became extinct by the
middle Jurassic.
This infraorder was once thought to be ancestral to
Sauropods
(hence the name "Prosauropoda", which means
"before Sauropoda"),
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
Riojasaurus
were fully quadrupedal (walking on four legs).
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