P. J.  Hayward and Ryland, J. S., Cheilostomatous Bryozoa. Part 2. Hippothoidea - Celleporoidea, vol. 14. Shewsbury: Field Studies Council, 1999.

P. J.  Hayward and Ryland, J. S., Cheilostomatous Bryozoa Part 1. Aeteoidea - Cribrilinoidea, vol. 10. Shrewsbury: Field Studies Council, 1998.

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