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 ...

These millimeter-sized objects are more than half a billion years old – the fossilized embryos of animals that lived during the early Cambrian ... group that contains jellyfish, anemones ...

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.

Such rudimentary visual organs are still used by jellyfish and flatworms and other ... In the sightless world of the Early Cambrian, vision was tantamount to a superpower. Trilobites became ...

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