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Word Count: 409
Worms Most people think of worms as slimy squiggly creaturesAndin fact many are There are however many kinds of worms that nothing like the worms used to bait fishing hooks You can see examples of such worms Worms are classified into three main phyla based on their shapes The three Phyla of worms are flatworms roundworms and segmented worms If you were to draw an imaginary line down the entire length of a Worms body you would discover that the right half is almost a mirror Image of the left half With the exception of one phylum this body symmetry is characteristic of all animal you will read about Flatworms Flatworms as you might expect have flat bodies They are grouped in the phylum Platyhelminthes The platyhelminthes comes from two Greek wordsplaty- Meaning flat and helminth meaning worm Some scientist believe that flatworms evolved from cnidarians Other scientist are confident that flatworms developed Independently You have probably never seen a flatworm much less a flatworm like the one in figure 1-20 This flatworm is called a planarian Most planarians which are Barely 05 centimeters long a little less than the width of the nail on your pinky Lived in ponds and streams-often on the underside of plant leaves or on underwater rocks Planarians feed on dead plant or animal matter When there is a little food available however some planarians do a rather unusual things They digest their own body parts Later when food is available Once again the missing parts regrow Interestingly if a planarian is cut into Pieces each piece eventually grows into a new planarian The ability of an organ Ism to grow to regrow lost parts is called regeneratio Some flatworms grow on Or in living things and are called parasites Tapeworm which look like long Flat ribbons
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