Unsegmented Worms. Flatworms. Flatworms. Belong to the phylum platyhelminthes . (Plat = flat) There are three classes: Turbellaria Trematoda Cestoda. Characteristics of Flatworms. They are acoelomates (they don’t have body cavities) They have bilateral symmetry Show cephalization
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The long and complex life-cycle of the fluke can be made easier to
understand through the use of a nonsense mnemonic :
Every - EggMirror - Miracidium (free-living in water)Spotted - Sporocyst (in snail)Red - Redia (in snail)Certainly - Cercaria (free-living in water/snail)Met - Metacercaria (in 2nd intermediate host)Approval - Adult