Spiders (and arachnids ... Of perhaps these strange arachnids clung on until the end Permian mass extinction.” Still, they had to put it somewhere to come up with a name.

About 250 million years ago, at the end of the Permian period, something killed some 90 percent of the planet's species. Less than 5 percent of the animal species in the seas survived. On land ...

Get Instant Summarized Text (Gist) The Permian mass extinction, 252 million years ago, was linked to a 10°C rise in global temperatures due to massive volcanic CO 2 emissions. This led to climate ...