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Temporal range: 515–505Ma
Xanioascus canadensis is an extinct ctenophore, known from the Canadian Burgess Shale in British Columbia. The species which is about 515 to 505 million years old had 24 comb rows - in contrast to all modern forms which have only 8.
- "Xanioascus canadensis". Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011.
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