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![]() ![]() " Sponges: An Historical Survey of Their Knowledge in Greek Antiquity." Journal of the Marine Biological Association of the United Kingdom 87.6 (2007): 1757–63. " The Largest Sponge in the World?" Marine Biodiversity 47.2 (2017): 367–68. University of California Museum of Paleontology. The collar cells act as the sponges digestive system. Collar cells also strain food from the water. Collar cells have whiplike structures that beat back and forth to move water through the sponge. 6 The layer that lines the central cavity is made of collar cells. "Marine Life of the North Atlantic." New York: Aqua Quest Publications, Inc., 2003. also carries the microscopic young sponges away from the parent sponge. Sponge Fishing in Key West and Tarpon Springs, American Sponge Diver, 2003 These cells are able to contract in order to regulate water flow through the body. Myocytes surround canal openings and porocytes. ![]() Although sponges have no muscle tissue and are sessile organisms, they do have muscle-like cells called myocytes. " Agalychnis" The IUCN Red List of Threatened Species: e.T55843A11379402, 2004. Spongin is a protein and it is secreted by cells called spongocytes. "Phylum Porifera: the sponges." Invertebrates. ![]()
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