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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]. The generic name reflects the type species' unusual appearance and eccentric history of study; when it was erected as a genus, H. sparsa 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.
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