1) Burgess Shale fossil 
Hurdia victoria is an extinct species of anomalocaridid that lived 505 million years ago during the Cambrian Period. It is part of the ancestral lineage that led to Arthropods and is related to Anomalocaris. Hurdia was one of the largest organisms in the Cambrian oceans, reaching approximately 20 cm (0.66 feet) in length. Its head bore a pair of s...