|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|
|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.