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Showing results for tags 'margaretia'.
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A rangeomorph holdfast trace fossil from the Ediacara formation, Rawnsley quartzite of the Flinders Range, South Australia. This specimen is Medusina mawsoni, so called because it was until recently thought to be a jellyfish, but is now believed to be the attachment point of a fractal rangeomorph as Charniodiscus is the point of anchorage for Charnia sp. This one may have been the holdfast point for some species of Rangea. The diameter of the outer circle is 1.5 cm and the fossil is estimated to be 555 million years old.
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From the album: Plants
Margaretia dorus Walcott, 1931 Middle Cambrian Burgess Shale Field British Columbia Canada Might be related to modern green algae Caulerpa, a genus of seaweeds-
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Oesia disjuncta Walcott, 1911 known as "Margaretia dorus Walcott, 1934"
oilshale posted a fossil in Other Invertebrates
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.