It is apart of the Phanerozoic Eon.
Trilobites existed in the Devonian period, but they were not exclusive to it. They were abundant before the period and continued to exist afterward, though in much less abundance.
The Devonian Period
The Devonian Period lasted from about 395 to 345 million years ago. It is part of the Paleozoic Era.
The period after the Devonian Period (416 to 359.2Ma) is the Carboniferous Period (359.2 to 299Ma).
Fish first appeared in the Cambrian period, long before the Devonian.
The Devonian period lasted from 416 million years ago to 359.2 million years ago.
eon is the period now .
During the devonian time period most of land was under water.
The Devonian Period
Devonian Period
If you mean animals as in insects (arthropods), they came in around the Devonian period of the Paleozoic era If you mean animals as in fish, amphibians etc then they came in at the same time as the arthropods
It was in the Phanerozoic Eon.