508 Million Years ago & counting :)

An artist illustrates how Tokummia katalepsis may have looked. The creature had two large pincers (maxillipeds) for hunting prey and a hard shell protecting most of its multisegmented body.

508 million years ago, this guy ruled the seas.

Like other Cambrian animals, T. katalepsis looks bizarre by today's standards. The predator had 50 paddle-like legs that likely helped it swim and walk in a tropical sea, and "a pair of very strong claws — some of the strongest claws we have seen in any Cambrian arthropod," said study co-author Jean-Bernard Caron, a senior curator of invertebrate paleontology at the Royal Ontario Museum in Canada. These claws likely helped the animal grasp and pierce soft-bodied prey, such as worms, he said.

The family tree  of said predator or just another way to kill time on the net. :)