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This is CBSI on the World I'm John Batchewa Thomas Halliday.

His book is Other Lands taking us back and back to 500 million years ago and more.

We go now to the Cambrian. This is a present day fossils in China and the scene is set by Thomas's magical writing.

The land was desolate and dry. There was an extreme greenhouse world and we're looking at what was happening underwater in the sea and the vast sea.

Thomas, you reported all modern filers were present at this moment right now. All of what we are is descended from here.

Where should we look? Should we look at the fish? Should we look at the sponges? The worm like worms? Where do we come from?

During the Cambrian, this is a Cambrian explosion where you get the first representatives of all of the filers. A filen in a biological sense is really a group that shares the same kind of body plan.

The filen includes fish and you and me and reptiles and birds and frogs and everything else with a backbone. Some of the earliest vertebrates are here at the time.

You've got high-couillic, this is a very simple fish like the reptile. Several worm creatures that will give rise to the artifacts, insects and crabs and lobsters and so on.

We do see representatives of most of the modern filers. I think I'm writing saying that there are no kind of worms, which include starfish and sea actions and so on at this place.

That's a preservation issue that their bodies have simply not been preserved at Chang-Jang but are known from elsewhere around the world.

It depends really what you want to ask. You know I've got a thing for apex predators. I've got to go to the one for the Cambrian. Omnidenz, what was it? You report apex predator.

Omnidenz is one of the biggest organisms around at that time. If you imagine a six-foot-limbed worm with grasping feeding appendages at the front,

you're probably horrified but are reasonably close to the idea. It's been described by Yakovintem, my colleague at the University of Bristol as being like the Sarlac in Star Wars.

There's a dwelling worm. Omnidenz is an arse of pod.

It is... I'm looking up from what you tell me. There are... I don't... I've stopped counting how many legs. Are those legs or are those sensors?

And it has a sweep front. It looks like one of the villains' spaceships in Star Trek.

It does a bit. They are legs in the sense of being used to move around.

So I think it has 24 of them. And it's most... It's this sort of circular array of spines that it would then bring out, evict, in order to grasp the prey and bring it in.

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