The Eryops was a massive animal almost 2 metres long. It weighed around 200 pounds, making it the biggest known amphibian of its time. It moved around extremely slowly as its uneven weight distribution caused it to wobble.
The Scutosaurus lived in small herds with its mates and lived off plants. It grew up to 2.5 metres long and had a heavy frame of bones and strong muscles, along with these things it had exceptional hearing that helped it hear its mates calling.
The Thrinaxodon survived the mass extinction period. this was most likely due to there exceptional burrowing skills and toughness.
The Hylonomus is the earliest known reptile. It is the first animal to have fully adapted to life on land and fed off millipedes and land snails. Female hylonomus deposited eggs in warm and sheltered places.
Canowindra Grossi was a lobe finned fish that grew to be 50cm long. Its head is of reptilian appearance which suggests that it was one of the latest fish to contribute to reptiles.
Ichthyostega possessed lungs and limbs that helped it navigate through shallow swamps. the first vertebrate with fish like tails and gills to walk onto land.
The Eurypterus was a sea scorpion that grew to be 23cm long. it was the first creature to possess a backbone and it used its large paddle-like tail to swim.
Arandaspis (jawless fish) lived in shallow waters. It is the oldest known vertebrate.
Tough-backed trilobites: ancestral arthropods made their entrance into seas during the Cambrian period. They were the dominant species during this time and they marked a burst of evolutionary changes. Red Lichiida being the largest of them all.
The Anomilacharis grew to be between 1.5 and 2 metres in length and only survived in the Cambrian. They mostly chased smaller trilobites such as the red lichiida.