![]() The beating of the choanocytes’ flagella creates the sponge’s water current. The collars are composed of microvilli and are used to filter particles out of the water. * Choanocytes (also known as "collar cells"), flagellated cells which function as the sponge's digestive system, are remarkably similar to the protistan choanoflagellates. Their similarity to colonial choanoflagellates shows the probable evolutionary jump from unicellular to multicellular organisms. With no true tissues (parazoa), they lack muscles, nerves, and internal organs. ![]() Sponges are among the simplest of animals. They are primitive, sessile, mostly marine, water dwelling filter feeders that pump water through their bodies to filter out particles of food matter. The sponges or poriferans (from the Greek poros "pore" and ferro "to bear") are animals of the phylum Porifera.
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