Petrolacosaurus
Petrolacosaurus (or Pétrolacosaure ) is oldest Reptile S diapsides known to date.
Physical aspect
It was a kind of small Lézard 40 centimetres length. It was to run rather quickly to escape predatory like Méganeura.
Distribution
The pétrolacosaure lived at the end of the Carbonifère, in the forests of current the the United States, the world being at this time rich in oxygen (roughly 40% of more than today).
Food mode
The pétrolacosaure mainly nourished small insects which it unearthed in the luxuriant forests the top Carbonifère. It was the principal prey of all the predatory giants of the time such as the giant spiders of the group of the Mesothelae, the named giant dragonflies Méganeura or the " amphibiens" giants like the Proterogyrinus .
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