'Swimming predators' that lived 500 million years ago found in Rockies

The now-extinct creature is the oldest swimming jellyfish discovered to date.

The specimens vary in size from just under one inch to almost eight inches in length, according to Caron.

"This discovery suggests that the Cambrian food-web was more complex than previously thought, with this new jellyfish being one of the largest predators known during that time" While fossilized polyps have previously been found in rocks dated to around 560-million-years-ago—even earlier than theSlab showing two bell-shaped specimens with the tentacles preserved. The fossils were discovered in the Burgess Shale formation located in the Canadian Rockies.The jellyfish fossil record is controversial, according to Caron.

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