Hydrozoa source details
Hayward, P.J.; Ryland, J.S. (1985). Cyclostome bryozoans: keys and notes for the identification of the species. Synopses of the British fauna (new series), 34. E.J. Brill; W. Backhuys: London, UK. ISBN 90-04-07697-2. vi, 154 pp.
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Publication