undersea cambrian animals with red sponges

pikaia gracilens fish animal aquatic arthropod marine carnivore predator hunter creature evolution lobes extinct extinction cambrian british columbia canada era age epoch period vertebrate chordate burgess shale ocean organism nature paleo art primeval primitive prehistoric sea life small swimming paleozoic undersea underwater jellyfish tentacle stinger dangerous poisonous stinging bioluminescence biofluorescent wild wildlife saltwater genus species blue reef swim tropical rendering animals predatory lived seas red sponges