J. S.  Ryland and Hayward, P. J. , British Anascan Bryozoans. 1977, p. 188.

P. J.  Hayward and Ryland, J. S. , Cheilostomatous Bryozoa Part II. Hippothooidea - Celleporoidea, 2nd ed., vol. 14. Published for the Linnean Society of London and the Estuarine and Coastal Water Sciences Association by Field Studies Council, Shrewsbury, 1999, p. 416pp.

P. J.  Hayward and Ryland, J. S. , Cyclostome Bryozoans, vol. 34. London: E.J.Brill for the Linnaean Society, 1985, p. 147pp.