Classification of Class Placodermi | Zoology
In this article we will discuss about the classification of class placodermi. Classification of Class Placodermi: Placodermi are the earliest jawed vertebrates, appeared in the Silurian periods, flourished in the Devonian and Carboniferous and became extinct in the Permian. They had 'heavy defensive armour and hinged jaws. The hyoid arch did not support the jaw (the aphetohyoidean condition) indicating that [...]