Literature
- Brusca, R.C. and G.J. Brusca 1990. Invertebrates. Sinauer Associates Inc., Sunderland, U.S.A. 922 pp.
- Hayward, P.J. and J.S. Ryland 1995. Handbook of the Marine Fauna of North-West Europe. Oxford University Press, Oxford. 800pp.
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