Ostracoderms: Occurrence and Features | Vertebrates | Chordata | Zoology
In this article we will discuss about:- 1. Occurrence of Ostracoderms 2. Important Features of Ostracoderms 3. Biological Significance 4. Inter-Relationship and Affinities. Occurrence of Ostracoderms: The earliest known vertebrates to appear in fossil record were jawless primitive fish-like animals collectively known as the ostracoderms. These were placed under the class Ostracodermi. The class Ostracodermi is represented by the fossil [...]