Edited by oilshale
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By oilshale (edited)
"Margaretia dorus"
Kingdom: Animalia
Eon: Phanerozoic
Era: Paleozoic
Period: Cambrian
Sub Period: None
Epoch: Middle
International Age: Wuliuan
Burgess Shale Formation
Acquired by: Purchase/Trade
Burgess
Field, Yoho National Park
British Columbia
Canada
Originally interpreted as a green algae with a relationship to the modern green alga Caulerpa, Margaretia dorus is now considered to be the feeding tube of the hemichordate Oesia. The position of Oesia is uncertain. Originally described as an annelid worm by Walcott (1911), a recent reinterpretation as a chaetognath (Szaniawski, 2005, 2009) has been vigorously rejected, and a position closer to the hemichordates proposed instead (Conway Morris, 2009).
Margaretia dorus would now be a junior synonym of Oesia disjuncta Walcott, 1911
References:
Simon Conway Morris and R. A. Robison (1988): MORE SOFT-BODIED ANIMALS AND ALGAE FROM THE MIDDLE CAMBRIAN OF UTAH AND BRITISH COLUMBIA. University of Kansas Paleontological Contributions, Paper 122.
CARON, J.-B. AND D. A. JACKSON (2008). Paleoecology of the Greater Phyllopod Bed community, Burgess Shale. Palaeogeography, Palaeoclimatology, Palaeoecology, 258: 222-256.
WALCOTT, C. D. (1931). Addenda to descriptions of Burgess Shale fossils. Smithsonian Miscellaneous Collections, 85: 1-46.
K. Nanglu, S. Conway Morris, J-B Caron and C. Cameron (2016). Cambrian suspension-feeding tubicolous hemichordates. BMC Biology 2016 14:56 DOI: 10.1186/s12915-016-0271-4.
Edited by oilshale
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