Trilobites were among the marine arthropods that date back to the Early Cambrian period until their final disappearance in the mass extinction at the end of the Permian. They are among the most successful aquatic animals, with over 20,000 species.
Adelospondylus is an extinct lepospondyli amphibian from the Early Carboniferous to the Early Permian. Aside from Adelospondylus, there were also four major Lepospondyli groups: Nectridea, Lysorophia, Aistopoda, and Microsauria.
There is a possibility that modern lissamphibians may have originated from the Late Carboniferous Amphibamus, though not all researchers support this theory. Amphibamus could grow up to 0.65 feet (20 cm) in total length.