How to view this content

You will need javascript enabled and the Flash browser plugin to access this movie.

Unfortunately we are unable to provide accessible alternatives for this content. If you need help accessing the content in this movie, please email npg@nature.com.

Hallucigenia: The worm with the missing head

The remains of an ancient worm species called Hallucigenia were so bizarre looking that scientists originally reconstructed it upside down and back to front. Now Martin Smith reveals the most complete picture so far of this peculiar marine worm.

Read the Nature paper 'Hallucigenia's head and the pharyngeal armature of early ecdysozoans' at www.nature.com/doifinder/10.1038/nature14573.

Find out more about Hallucigenia and other finds from the Burgess Shale at www.burgess-shale.rom.on.ca

24 June 2015