Paleozoic echinoderm hangover: Waking up in the Triassic
(PHYSorg.com Archaeology & Fossils)

The end-Paleozoic witnessed the most devastating mass extinction in Earth`s history so far, killing the majority of species and profoundly shaping the evolutionary history of the survivors. Echinoderms are among the marine invertebrates that suffered the most severe losses at the end-Permian extinction.