When did Agnatha first appear in the fossil record?
Category:
pets
reptiles
Evolution in Action
The fossil record indicates that agnathans were numerous during the late Silurian/early Devonian (390–420 million years ago) but only the lampreys (Petromyzontiformes) and hagfishes (Myxinoformes) have survived until the present day.
Keeping this in view, when did the Agnatha first appear in the fossil record?
420 million years ago
Similarly, when did vertebrates appear in the fossil record?
450 million years ago
Amphibians were the first tetrapod vertebrates as well as the first vertebrates to live on land.