Chapter 18- Amphibians

Class Amphibia are also called

Tetrapods

How to amphibians breathe?

Double respiration through lungs and skin

what is their connection with land?

Can move relatively long distances into land but are still connected to aquatic environments for reproduction

Reproduction of Amphibians?

Need aquatic environments

lay large number of unprotected eggs

Why is lung respiration of amphibians not the best?

They did not evolve a chest bone

Class Amphibia evolved from ——- ancestors

Rhipidistia

Strat range of Amphibians

Uppermost Devonian- Holocene

In transition of Rhipidtian ancestors terrestrial

• Eusthenopteron

• Order Rhipidstian

• fully marine

• in the upper devonian

What are these two

Tiktaalik and Acanthostega

Semi aquatic

Upper Devonian

Pederpes

mostly terrestrial

Upper devonian

Most primitive of amphibians subclass

subclass Ichthyostegalia

Strat range of Ichthyostegalia

Uppermost Devonian - Lower Caboniferous

Oldest two genera that are clearly amphibians, from uppermost devonian

Acanthostega and Icthyostega