P. E. J.  Dyrynda and Ryland, J. S., ?REPRODUCTIVE STRATEGIES AND LIFE HISTORIES IN THE CHEILOSTOME MARINE BRYOZOANS CHARTELLA-PAPYRACEA AND BUGULA-FLABELLATA?, Marine Biology, vol. 71, pp. 241-256, 1982.

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.