How Bizarre Paleontology

Fossil worm adds head to its spiny appearance

New details about ancient creature give hints to evolution of some animals’ teeth

Hallucigenia sparsa, illustrated

OUT OF A DREAM  Hallucigenia sparsa (illustrated) finally has a head, thanks to a new analysis of fossils.

Danielle Dufault

By Ashley Yeager

- More than 2 years ago

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Whether it’s upside down or right side up, Hallucigenia sparsa looks like it wriggled right out of a nightmare.