PBS Eons has a new episode over on Youtube.  This one is about anomalocaris… a giant anomalocaris called Aegirocassis.

At more than 2 meters long, Aegirocassis was not only the biggest radiodont ever, but it also may have been the biggest animal in the Early Ordovician. This bizarre marine giant may have only been possible, thanks to a major revolution among some of the tiniest organisms in the world.