Trilobites are one of the most instantly recognisable groups of fossils. They were present from the very start of the Paleozoic and went on the fill a great number of ecological roles before going extinct at the Permo-Triassic mass extinction event 252 million years ago. They ranged from the very small to the very large, from the most basic appearance to the most elaborately ornamented.

We were lucky enough to get the opportunity to speak to Prof. Richard Fortey of the Natural History Museum, London, all about trilobite morphology and ecology.