Trilobite

Trilobites are an extinct arthropod appeared in the Cambrian period, over 520 million years ago. Named for the three vertical lobes that make up their body, these creatures were also the first animals to evolve complex eyes. Extremely successful animals in their environments, the thousands of species make up the most common fossils on earth. They most likely ate small soft organisms like worms or sifted through the sand to find organic particulates.