Jawless fishes were originated around

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500 mya Origin of Invertebrates . 350 mya Origin of Jawless fishes . - It is of common opinion that the first organisms that invaded land were plants. 320 mya Origin of Sea weeds and few other plants. 200 mya - Some land reptiles (the dinosaurs) went back into water and evolved into fish like reptiles (e.g. Ichthyosaurs). 65 mya - Sudden disappearance of dinosaurs from the earth. Probable reasons : Climatic changes / Evolution of most of them into birds / etc. - Small sized reptiles of that era are still existing today.

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Doubts & Discussion

500 mya	Origin of Invertebrates .
350 mya	Origin of Jawless fishes . - It is of common opinion that the first organisms that invaded land were plants.
320 mya	Origin of Sea weeds and few other plants.
200 mya	- Some land reptiles (the dinosaurs) went back into water and evolved into fish like reptiles (e.g. Ichthyosaurs).
65 mya	- Sudden disappearance of dinosaurs from the earth. Probable reasons : Climatic changes / Evolution of most of them into birds / etc. - Small sized reptiles of that era are still existing today.