Bryozoans Members of phylum Bryozoa are colonial and sessile animals. Over 500 species are known to occur in Australia. Additional biological information is available for bryozoans . Ascidians Ascidians are also sessile animals. They may be solitary or colonial.
Sea squirts are familiar examples of large solitary ascidians.
Additional biological information is available for ascidians . It is mainly the colonial ascidians that contain secondary metabolites and, elsewhere in the world, a very wide variety of compounds has been identified. One Tasmanian ascidian has been discovered to contain novel compounds and several alkaloids possessing new heterocyclic ring systems have been identified. Seaweeds Tasmania's temperate waters support an abundance of marine algae. Additional biological information is available for seaweeds .