abundant on west and south-west British coasts, less common in the North Sea.
- Hayward, P.J.; Ryland, J.S. (Ed.) (1990). The marine fauna of the British Isles and North-West Europe: 1. Introduction and protozoans to arthropods. Clarendon Press: Oxford, UK. ISBN 0-19-857356-1. 627 pp. http://www.marinespecies.org/aphia.php?p=sourcedetails&id=1
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