The Devonian Period, 409 - 360 million years ago, belongs
to the fish. It was the peak of global sea level rise. By this
time the fishes had evolved into the most efficient animals in
the sea. By the late Devonian they began to colonize the land
as they developed lungs for breating air, and paired limbs for
mobility on land, giving rise to the first land vertebrates,
The now extinct cephlopod mollusks, called ammonites, also
flourished in the seas together with a diverse population of
trilobite arthropods. The earliest insect arthropods, the "springtails"
moved out of the sea and the first plants with seeds began to
forest the land.