Figure 5.3 The components of sponges. a: Connective elements. Spicules are mineralized connective elements made either of calcite or silica. Certain sponges lack spicules but are held together by networks of a fibrous protein, spongin. [From Storeretal. (1979)] b: Cell types. c: The choanocyte filters microorganisms and other food items from the stream of water driven through its collar by the flagellum. Solid arrows (on collar of choanocyte) indicate direction of movement of captured items of food [b and c from Hickman and Hickman (1992)]
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