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Named By: Simon Conway Morris in 1977
Time Period: Cambrian Stage 3-Middle Cambrian
Location: Canada, British Columbia - Burgess Shale. China - Maotianshan Shale
Size: 5 to 30 millimetres long
Diet: Detritivore
Fossil(s): 109 specimens
Classification: | Animalia | Onychophora | Hallucigeniidae |
Also known as: | Canadia Sparsa |

Hallucigenia is a genus of Cambrian xenusiids known from articulated fossils in Burgess Shale-type deposits in Canada and China, and from isolated spines around the world. Its quirky name reflects its unusual appearance and eccentric history of study; when it was erected as a genus, the animal was reconstructed upside down and back to front. Hallucigenia is now recognized as a "lobopodian worm". It is considered by some to represent an early ancestor of the living velvet worms, although other researchers favour a relationship closer to arthropods.

Read more about Hallucigenia at Wikipedia
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