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Food particles are trapped in mucus produced by the sieve-like collar of the choanocytes and are ingested by phagocytosis. The beating of flagella from allĬhoanocytes moves water through the sponge. The choanocyte is embedded in mesohyl but protruding into the spongocoel is a mesh-like collar surrounding a single flagellum. Many marine species host other photosynthesizing organisms, most commonly cyanobacteria but in some cases dinoflagellates. The mesohylĬontains embedded amoeboid cells that secrete tiny needles called spicules or protein fibers that help give the sponge its structural strength. Freshwater sponges often host green algae as endosymbionts within archaeocytes and other cells and benefit from nutrients produced by the algae. Sponges consist of an outer layer of flattened cells and an inner layer of cells called choanocytes separated by a jelly-like substance called mesohyl. However, sponges exhibit a diversity of body forms, which vary in the size and branching of the spongocoel, the number of osculi, and where the cells that filter food from the water Water flows out through a large opening called the osculum ( Figureġ5.9). Water enters the spongocoel from numerous pores in theīody wall. They are not able to transport nutrients within their bodies but must independently. They have simple digestive and circulatory systems composed of spongin. They rely on diffusion to move nutrients between their cells. D) They are not able to transport nutrients. C) Their mobile amoebocytes transport food molecules from cell to cell. B) They rely on diffusion to move nutrients between their cells. \): (a) Clathrina clathrus belongs to class Calcarea, (b) Staurocalyptus spp.The body of the simplest sponges takes the shape of a cylinder with a large central cavity, the spongocoel. How do sponges transport nutrients within their bodies Their mobile amoebocytes transport food molecules from cell to cell. 37) How do sponges transport nutrients within their bodies A) They have simple digestive and circulatory systems composed of spongin channels.