Joe Moysiuk and his team from the University of Toronto analyzed fossilized remains from Cambrian shale from Burgess. Particularly striking is the Burgess Shale jellyfish, known as Burgessomedusa ...

They weren’t jellyfish. There were other shapes too ... years before a better known evolutionary drama, the famous Cambrian explosion. Scientists until then had believed that the Cambrian ...

Unlike the hard exoskeletons found in many of the Cambrian fossils ... like cnidarians — a group that includes animals like jellyfish and sea anemones — worms, and possibly sponges.

In the evolution of metazoans, sponges diverged first, followed by cnidarians (jellyfish and corals ... of bilaterian body plans in the Cambrian explosion.