Herrerasaurus (specimen PVSJ 407), one of the earliest dinosaurs, part of the Ischiqualasto fauna, Triassic.
<a href="//commons.wikimedia.org/wiki/User:Joerim" title="User:Joerim">Joerim</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>