Question

How many marine species died out during the Paleozoic Era?

Answer 1

By the end of the Paleozoic, cycads, glossopterids, primitive conifers, and ferns were spreading across the landscape. The Permian extinction,244 million years ago, devastated the marine biota: tabulate and rugose corals, blastoid echinoderms, graptolites, and most crinoids died out, as did the last of the trilobites.