Pywackia
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Scientific classification 
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| Template:Taxon infoTemplate:Taxon italics Landing in Landing et al., 2010
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Pywackia is a contentious Cambrian fossil that has been interpreted as the earliest (total group) bryozoan, and the only representative of that phylum in the Cambrian period.[1] Its bryozoan credentials have been called into question,[2] but the octocoral alternative is equally unconvincing, and there are reasons to suggest a position in the Stenolaemata stem lineage.[3] Finally, the skeletal microstructure is consistent with a cnidarian affinity, but insufficient to support a close affinity with any modern subgroup.[4]
References
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- ^ Page Module:Citation/CS1/styles.css has no content.Landing, E.; English, A.; Keppie, J. D. (2010). "Cambrian origin of all skeletalized metazoan phyla--Discovery of Earth's oldest bryozoans (Upper Cambrian, southern Mexico)". Geology. 38 (6): 547. Bibcode:2010Geo....38..547L. doi:10.1130/G30870.1.
- ^ Page Module:Citation/CS1/styles.css has no content.Taylor, P. D.; Berning, B. R.; Wilson, M. A. (2013). "Reinterpretation of the Cambrian 'Bryozoan' Pywackia as an Octocoral". Journal of Paleontology. 87 (6): 984. Bibcode:2013JPal...87..984T. doi:10.1666/13-029. S2CID 129113026.
- ^ Page Module:Citation/CS1/styles.css has no content.Ed Landing; Jonathan B. Antcliffe; Martin D. Brasier; Adam B. English (2015). "Distinguishing Earth's oldest known bryozoan (Pywackia, late Cambrian) from pennatulacean octocorals (Mesozoic—Recent)". Journal of Paleontology. 89 (2): 292–317. Bibcode:2015JPal...89..292L. doi:10.1017/jpa.2014.26. S2CID 131609198.
- ^ Page Module:Citation/CS1/styles.css has no content.Hageman, Steven J.; Vinn, Olev (2023). "Late Cambrian Pywackia is a cnidarian, not a bryozoan: Insights from skeletal microstructure". Journal of Paleontology. 97 (5): 1–12. Bibcode:2023JPal...97..990H. doi:10.1017/jpa.2023.35.
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