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phylum. Although it is commonly accepted to be within
Annelida, it is uncertain how it relates to modern annelids. Most paleontologists agree that it belongs to the class Polychaeta due in part to the presence of
570:
Butterfield, N.J., 1990b. A reassessment of the enigmatic
Burgess Shale fossil Wiwaxia corrugata (Matthew) and its relationship to the polychaete Canadia spinosa Walcott. Paleobiology, v.16, no.3, p.287-303
432:
Caron, Jean-Bernard; Jackson, Donald A. (October 2006). "Taphonomy of the
Greater Phyllopod Bed community, Burgess Shale". PALAIOS. 21 (5): 451–65. doi:10.2110/palo.2003.P05-070R. JSTOR 20173022.
389:, another organism from the Burgess Shale. Both were placed in a new superfamily called Canadiacea, and were thought to be of closer relationship to each other than to modern annelids. However,
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Parker, A. R. 1998. Colour in
Burgess Shale animals and the effects of light on evolution in the Cambrian. Proceedings of the Royal Society of London Series B 265:967-972.
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339:, suggesting that the animal was carnivorous. This is further evidenced by the lack of sediments found in the gut that would be present in a benthic
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Eibye-Jacobsen, D. (September 2004). "A reevaluation of
Wiwaxia and the polychaetes of the Burgess Shale. Lethaia, v.37, no.3, p. 317-335
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It would also have had the ability to creep along the seafloor using the ventral counterpart of the notopodia, which are termed
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is thought to have swum above the seafloor as a primary means of locomotion by beating its numerous notosetae.
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Conway Morris, S. (1979). "Middle
Cambrian Polychaetes from the Burgess Shale of British Columbia".
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is no longer believed to have been an annelid and there is currently dispute as to whether or not
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With length up to 4.5 centimeters (1.8 inches), the animal's most notable feature is the many
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Parker, Steve. Dinosaurus: the complete guide to dinosaurs. Firefly Books Inc, 2003. Pg. 37
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should be classified as belonging to anything more derived than
Polychaeta.
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was straight and had the ability to extend out of the body in the form of a
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465:"Canadia spinosa and the early evolution of the annelid nervous system"
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270:, the country from which its remains have been found. 28 specimens of
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515:"Paleobiology | Smithsonian National Museum of Natural History"
246:) is a genus of extinct annelid worm present in Burgess Shale type
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305:) along the back of the animal that are characteristic of
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Burgess Shale Fossil
Gallery. Virtual Museum of Canada
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around 505 million years ago, during the time of the
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worms. A 1998 paper suggested that it may have been
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379:. It has been proposed to be a member of the order
366:There has been some debate as to the placement of
331:and may have served as sensory organs. The gut of
463:Parry, Luke; Caron, Jean-Bernard (2019-09-06).
354:(in reference to the proximity to the paired,
278:, where they comprise 0.05% of the community.
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856:CEB4ACEC-036B-4B89-B2FB-8F0E26ABDD30
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301:extending from dorsal branches of
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313:due to the supposed presence of
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409:Paleobiota of the Burgess Shale
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894:Fossil taxa described in 1911
358:characteristic of annelids).
274:are known from the Greater
16:Species of annelid (fossil)
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889:Cambrian genus extinctions
260:Charles Doolittle Walcott
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120:Scientific classification
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884:Cambrian invertebrates
550:10.1098/rstb.1979.0006
482:10.1126/sciadv.aax5858
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879:Burgess Shale animals
825:Paleobiology Database
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248:Konservat-Lagerstätte
315:diffraction gratings
610:Paleontology portal
542:1979RSPTB.285..227M
356:ventral nerve cords
327:extended from the
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256:Cambrian explosion
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693:Open Tree of Life
622:Taxon identifiers
536:(1007): 227–274.
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383:along with
370:within the
341:detritivore
282:Description
873:Categories
415:References
377:Parapodium
352:neuropodia
329:prostomium
319:microvilli
311:iridescent
307:polychaete
167:Polychaeta
111:Fossil of
764:Q18519556
491:2375-2548
337:proboscis
325:Tentacles
303:notopodia
295:notosetae
240:of Canada
238:(meaning
192:Species:
143:Kingdom:
137:Eukaryota
758:Wikidata
685:10228533
645:Q2160154
639:Wikidata
403:See also
372:Annelida
252:Cambrian
157:Annelida
153:Phylum:
147:Animalia
133:Domain:
851:ZooBank
817:4983814
804:1441038
791:2319093
778:3140127
749:Canadia
732:ZooBank
698:4983815
672:2319094
659:3140128
595:. 2011.
558:2418139
538:Bibcode
500:6739095
397:Canadia
392:Wiwaxia
386:Wiwaxia
368:Canadia
345:Canadia
333:Canadia
297:(rigid
272:Canadia
264:Canadia
235:Canadia
217:†
196:†
181:Canadia
173:Genus:
163:Class:
843:324438
724:327333
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268:Canada
262:named
838:WoRMS
799:IRMNG
719:WoRMS
706:Plazi
680:IRMNG
554:JSTOR
299:setae
830:7099
786:GBIF
667:GBIF
487:ISSN
37:Preęž’
773:EoL
654:EoL
546:doi
534:285
495:PMC
477:doi
242:or
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