What were the largest Paleozoic land animals?

OK, we’re familiar with the Cenozoic megafauna (dinosaurs), and the Cenozoic has a fair number of large mammals, both extant and extinct. But what about the Paleozoic? About the only land critters we ever see from that era are the Dimetrodon “sailbacks.” I know they weren’t the largest, but what were the largest (as well as largest predator)?

:smack: Mesozoic was misspelled as “Cenozoic” in its first occurrence.

Among the biggest land animals were some of the therapsids (mammal-like reptiles), such as the dinocephalians, which reached the size of an ox or even a rhino, and the predatory eotitanosuchids, which got up to 6 m long and 500 kg. There were also a number of very large crocodile sized amphibians. Some other large Paleozoic forms are illustrated here.