Sponges are unique in possessing special flagellated cells whose beating drives water through the body cavity.These specialized cells are known as

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The special flagellated cells found in sponges are called choanocytes, also known as "collar cells." These cells have a flagellum surrounded by a collar of microvilli that create a water current, allowing the sponge to filter out small particles for food. Cnidocytes and nematocysts are structures found in cnidarians (such as jellyfish and corals) that are used for capturing prey or defense. Planulae are free-swimming larvae of cnidarians and some other invertebrates. Spicules are tiny, needle-like structures that provide structural support in sponges.

Sponges Are Unique in Possessing Special Flagellated Cells Whose Beating