Mammals: Mammals are the dominant animals of Gaia Mars. They grow to huge sizes, but the small ones are in competition with giant insects.
Insects: Insects are the only land arthropods on Gaia Mars, but unlike Earth they grow to huge sizes, bigger than the arthropods of the Carboniferous.
Amphibians: Only 1 amphibian was transported into Mars. And that was the marbled salamander. It has since radiated into multiple forms.
