"…The discovery of anomalocaridids in the Ordovician shows that they did not become extinct around 510 million years ago but persisted at least a further 30 million years.  More exploration in the right kind of settings to preserve soft-bodied fossils might well reveal more examples.  But clearly anomalocaridids persisted as important predators at later times. They played a role as marine communities became more complex and the number of animal genera in the seas increased nearly four times during the Great Ordovician Biodiversification Event"