The Pragian is one of three faunal stages in the Early Devonian Epoch.
The most important Lagerstätte of the Pragian is Rhynie chert in Scotland.
In North America the Pragian Stage is represented by Siegenian or Deerparkian time.
The first ammonoids (order Agoniatitida) appeared in later parts of this stage (at the lower boundary of the Zlichovian stage as it was known in Siberian representations).
They were descended from bactritoid nautiloid ancestors, which also appeared in this stage before experiencing evolutionary radiations in the next stage.