Jawless Fish Research Paper

Introduction: After the extinction of some species, first vertebrate animals have appeared on the land. These animals are fishes which were appeared in the earliest of Paleozoic era specifically in Cambrian (jawless fish fossil). The evidence of this appearance was finding fossils in sedimentary rocks such as limestone, shale, sandstone and etc. Millions years later, different type of fishes have appeared after the jawless fish, which are fishes with jaw. Later on ray finned fishes appeared and evolved into amphibians and finally to reptiles.
Jawless fish
It is also called ‘Agnatha’ which means no jaw. It is the first and the earliest vertebrate. Fossils of Agnatha are found from late Cambrian. This type of fish doesn’t have fins and the