Opabinia is a stem-group arthropod that lived in the Cambrian period, 505 million years ago. It barely resembles anything else (except for a possible relative, with 5 eyes and a long proboscis to grab prey to transport to the mouth. It was only 4 to 7 centimeters long from the tip of the head to the tip of the tail. It might have been intended to be in the episode Death Rays, but as it lived around 50 or so million years earlier, it was cut.
What could have beenEdit
Opabinia was possibly supposed to appear in Death rays, as a predator to Astraspis, but was cut because it already went extinct.