EARLIEST TETRAPOD RECORD
- Ichthyostega means 'fish plate' because the roof
of the skull was shaped like a fish plate.
- This is considered the most primative of all tetrapods.
- Acanthostega means 'spine plate' because of prongs
found at the back of the skull.
- This is a type of jawless fish that is under debate as
to whether it can be considered the more primative tetrapod.
Amphibian vs Reptile skulls