creatures that lived in the paleozoic era are dunkleosteus the bone headed fish
another is diplocaulus also TRILOBITE another is dimetrodon also EURYPTERIDS
The Paleozoic Era is known for the development of many modern groups of animals, including arthropods, fish, amphibians, and reptiles. Mammals and birds would not come until the Mesozoic Era.
The most noteworthy feature of Paleozoic life is the sudden appearance of nearly all of the invertibrate animal phyla in great abundance at the beginning of the Cambrian. A few primitive fishlike...