Its estimated that over
90% of all marine species and over 70% of terrestrial vertebrates got whacked during the Permian extinction, but you know, things worked out.
Trilobites were wiped out, so I wonder how they woyuld have tasted with melted butter. But crabs lived, so we are OK.
As to the terrestrial vertebrates, the demise of Dimetrodon was probably a good thing...