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| Jellyfish, hydras, crals, sea anemones, man-of-war. Named for the cnidocytes on their tentacles. Polyp and medusa form. Polyp-> medusa by asexual. Medusa->polyp by sexual. |
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| obelia and portuguese man-of-war |
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| comb jellies. Don't have nematocysts. Have comb rows, clsely spaced cilias that are fused at the bases. |
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| Platyhelminthes. Include planarians, tapeworms, and liver flukes. |
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| Tapeworm. Part of the flatworm phylum. Platyhelminthes |
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Four characteristics
1. A hard calcium based external shell for protection, which may be reduced or absent in some mollusks
2. An internal tissue structure called a mantle, wich forms the shell
3. A visceral mass containing the internal organs
4. A ventral muscular foot for locomotion |
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| Shell divided in two halves. Clams, oysters, and mussels. |
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| Use tentacles to grasp prey. Closed circulatory system. Octopus and squid |
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| Shell composed of eight dorsal plates. Unsegmented body. Look like kabuto. Chitons. |
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