Life in Panthalassa

That was a long period of time. Virtually everything that has ever existed in the oceans existed across that span of prehistory (minus the recently evolved creatures of today of course).

only ltely are we even able to define the exact location of the Ocean that surrounded Pangea. Remember its all been sucked down into the mantle as subduction occured. A smal marginal area called the Tethyian Sea has some bit of a fossil record but Youd be correct to wonder what actually lived there in Panthalassa, we just dont know.