article_snippet: A predator armed with six long claws  prowled the Cambrian seas more than 500 million years ago and was among the ancestors of modern insects, spiders and lobsters, scientists have found.
article_snippet: The creature prey in the prehistoric seas of the Cambrian period.
article_snippet: Palaeontologists say the species was probably one of the first predatory arthropods to roam the planet - a group that later evolved into spiders, lobsters and insects.
article_snippet: The predatory creature, which like all arthropods had an external skeleton or exoskeleton, is thought to have lived 508 million years ago.
article_snippet: Cedric Aria, a evolutionary biologist at the University of Toronto who was part of the team that discovered the species, said: 'This creature is expanding our perspective on the anatomy and predatory habits of the first arthropods, the group to which spiders and lobsters belong. '
article_snippet: This creature has the signature features of an arthropod with This creature external skeleton, segmented body and jointed appendages, but lacks certain advanced traits present in groups that survived until the present day. '
article_snippet: our say that it belongs to the 'stem' of arthropods.'
highlights_snippet: The creature is an early predatory arthropod that swam the Cambrian seas .
  
highlights_snippet: Fossil belongs to a group that gave rise to spiders, insects and lobsters .
  