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Unformatted text preview: Notes on Invertebrate Marine Animals Invertebrate marine animals Vertebrates: animals with a backbone Invertebrates: animals without a backbone o There are more invertebrates than vertebrates Porifera The representative groups of the phylum Porifera are sponges o Sponges are considered as one of the structurally simplest multicellular animals, and they lack true tissues and organs. Sponges consist of aggregations of cells, which carry out specific functions. The collar cells of the sponge trap food particles The osculum is a large opening located on top of the sponge that allows water to escape. o Nearly all sponges are marine o Sponges are filter feeders because they filter food particles that are suspended in water. Cnidarians Examples of cnidarians: sea anemones, corals, jellyfish. Cnidarians are multicellular animals that have tissue o Cnidarians have radial symmetry. o They have nematocysts, which are stinging structures used to capture prey. o They lack true nerves or a brain, but they have specialized nerve cells that are interconnected....
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.
- Fall '10