Ryland, J. S., de Blauwe, H., Lord, R. and Mackie, J. A. (2009) “Recent discoveries of alien Watersipora (Bryozoa) in Western Europe, with redescriptions of species”, Zootaxa. Auckland, New Zealand, 2093(1), pp. 43–59. doi: 10.11646/zootaxa.2093.1.3.