Middle Cambrian, 505Ma
Mackenzia is a elongated bag-like animal known from the Middle Cambrian Burgess Shale. It attached directly to hard surfaces, such as brachiopod shells. 14 specimens of Mackenzia are known from the Greater Phyllopod bed, where they comprise <0.1% of the community.Mackenzia was originally described by Charles Walcott in 1911 as a holothurian enchinoderm. Later, Mackenzia is thought to be a cnidarian and appears most similar to modern sea anemones.
- "Mackenzia costalis". Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011.
- Caron, J. -B.; Jackson, D. A. (October 2006). "Taphonomy of the Greater Phyllopod Bed community, Burgess Shale". PALAIOS 21 (5): 451–465. doi:10.2110/palo.2003.P05-070R.
- Durham, J. W. (1974). "Systematic Position of Eldonia ludwigi Walcott". Journal of Paleontology (Paleontological Society) 48 (4): 750–755. doi:10.2307/1303225. JSTOR 1303225.
- Conway Morris, S. (1993). "Ediacaran-like fossils in Cambrian Burgess Shale–type faunas of North America". Palaeontology 36 (31–0239): 593–635.
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