Definition
Anaspida is an extinct group of jawless fish that lived during the Silurian and Devonian periods. Unlike many other early fish, they lacked heavy bony armor. They had streamlined bodies, suggesting they were active swimmers. Anaspida are considered to be among the more advanced jawless fish. They may be related to modern lampreys. Imagine them as the sleek sports cars of the ancient seas ποΈ. Studying Anaspida helps to understand the evolution of fish.