How It Works
Nautilus

Head to head: Living fossils

Nautilus

Coealacanth
Old
Although previously thought to be extinct, two species of coelacanth have remained virtually unchanged for 300 million years.

Coelacanth

Crinoid
Older
Ancient relatives of starfish, crinoids dominated the seas some 450 million years ago and still, in fact, exist in the oceans today.

Crinoid

Nautiloid
Oldest
Members of the nautiloid group – a type of cephalopod – appeared in the fossil record 500 million years ago and have changed very little since.

Nautilus

 

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