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Content: These include pinworms, hookworms, trichinella, and heartworms. Competition for resources is fierce in the micro-world of the nematode. In addition to avoiding larger animals, they might also be trapped by the nematode distroying fungior harpooned by Haptoglossa mirabilis. Annelida: the segmented worms 

Members of this phylum, including the earthworm, 
are free-living animals. Even most leechesare carnivores. While some suck blood, they are only "external" parasites. A comparison of "worms" should include: Mortician
Lab #1
Lab #2
Type of body cavity (coelom): Flatworms are acoelomate- they have three germ layers, but no coelom.