Phylum Hemichordata       Subphylum:  Urochordata  Cepahlochordata  Vertebrata


SUPERCLASS GNATHOSTOMATA

Class Amphibia

Ichthyostega sp.




Archegosaurus sp.


Seymouria

frogs


Salamandra




Necturus


caecilians or blindworms

caecilians or blindworms


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