Nudibranch Biology Colours and defence
Frick K. 2003. Predator suites and Flabellinid Nudibranch nematocyst complements in the Gulf of Maine. Proceedings of the American Academy of Underwater Sciences', 22nd Annual Scientific Diving Symposium. The nematocysts wander through the alimentary canal without harming the nudibranch. Then, the cells are brought to specific places on the creature's hind body. Nudibranches can protect themselves from the hydroids and their nematocysts. It is not yet clear how, but special cells with large vacuoles probably play an important role.