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Fossil Record


The Bryozoa have an incomplete fossil record because of the poor fossilization-potential of non-calcified forms such as the Ctenostomata. Bryozoans appeared in the early Ordovician and underwent a rapid burst of evolution. Particular groups were dominant at different periods in Earth history.






The image below shows geological ranges of key bryozoan Classes and Orders throughout geological history. Please click the image for a larger version.



Redrawn from Clarkson (1998)


Author: Luke Mander
Last updated: 20.11.05
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Websites produced by students on the MSc Palaeobiology programme in the Department of Earth Sciences at the University of Bristol for academic year 2005-6