It is apart of the Phanerozoic Eon.
Ammonites first appeared during the Devonian Period within the Paleozoic Era.
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.
Phanerozoic.
The Devonian period lasted from 416 million years ago to 359.2 million years ago.
The Devonian period is a geologic time period that occurred approximately 419 to 359 million years ago. During this time, life existed in various forms, including fish, plants, and invertebrates. The organisms living during the Devonian period inhabited environments such as oceans, rivers, and landmasses that are now part of present-day continents.
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
During the devonian time period most of land was under water.
It was in the Phanerozoic Eon.
the current eon period is pleistocene period