June 2013 : Opabinia is an extinct stem-arthropod genus found in Cambrian fossil deposits. The only known species, O. regalis, is known from the Middle Cambrian Burgess Shale Lagerstätte of British Columbia, Canada.
Cambrian Creatures Gallery: Photos of Primitive Sea Life The Cambrian also saw the rise of larger creatures, such as this ancient shrimplike creatures called anomalocaridids had long, which had spiny head limbs for catching prey
Opabinia lived during the Cambrian period across all oceans across the world. Second-most apex predator of its time, it hunted in the small fish groups of early fish; it was always overlooked due to the flashier appearance of anomalocaris.