Phacops is a genus of trilobite that lived during the Silurian and Devonian periods in Europe and North America. Phacops is often found enrolled, or curled into a ball as a biological defense mechanism.
- David L. Bruton & Winfried Haas (2003). "Making Phacops come alive". In Philip D. Lane, Derek J. Siveter,& Richard A. Fortey. Trilobites and their Relatives: Contributions from the Third International Conference, Oxford 2001. Special Papers in Palaeontology. 70. Wiley-Blackwell. pp. 331–348. ISBN 9780901702814.
- John P. Rafferty (2010). "The Silurian Period". The Paleozoic Era: Diversification of Plant and Animal Life. Geologic History of Earth. The Rosen Publishing Group. pp. 138–186. ISBN 9781615301966.
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