Sunday, October 14, 2007

Phylogeny



•First documented fossil found in South Australia and dates back 600 million years ago. (dated from Precambrian).
•Evolutionary relationships are subject to lots of debate.
•Reasoning suggests that the polyp stage was evolved second, and loss of the original body form, the medusa, places Anthozoa as the most derived taxon.
•Allied with ctenophores? one body opening....but lack cnidae

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