The gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Cnidaria (including jellyfish and corals) and Platyhelminthes (flatworms). The cavity may be extensively branched into a system of canals. In cnidarians, the gastrovascular system is also known as the coelenteron. The radially symmetrical cnidarians have a sac-like body in two distinct layers, the epidermis and gastrodermis, with a jellylike layer called the mesoglea between. Extracellular digestion takes place within the central cavity of the sac-like body. This cavity has only one opening to the outside and, in most cnidarians, that is surrounded by tentacles which serve to capture prey.
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- Slobodkin, Lawrence; Bossert, Patricia (2010). "Cnidaria". In Thorp, James H.; Covich, Alan P. Ecology and Classification of North American Freshwater Invertebrates (3rd ed.). Amsterdam: Academic Press. pp. 125–142. ISBN 9780123748553.
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