The clade lived for around 300 million years!

Trilobite (pronunciation: "TRY-loh-bite") - The name means "Three Lobes". They were already here before the Cambrian explosion, survived numerous mass extinctions and lived until the end Permian extinction event, the end of the Paleozoic age. This clade lived for around 300 million years! The earliest trilobites known from the fossil record are redlichiids and ptychopariid bigotinids dated to some 540 to 520 million years ago. #utdgss