Lab #1.docx - Survey of the Animal Kingdom Phyla...

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Survey of the Animal Kingdom Phyla Platyhelminthes and Nematoda Introduction: Flatworms of phylum Platyhelminthes and roundworms of phylum Nematoda live in marine, fresh water, terrestrial worms, plus two rather important parasitic groups: the flukes and the tapeworms. They're both members of a class called "Platyhelminthes". The biological difference between the two is that the tapeworms (cestoda) do not have guts. They live in digestive tracts and absorb nutrients through their skins. Flukes (trematoda) have a gut with a mouth on one end and an anus on the other. There are many species of both cestoda and trematoda, with many different kinds of life cycles. They're probably evolutionarily related, with the trematoda being "paraphyletic" to the cestoda. That is, the flukes may have evolved from the tapeworms. Materials: - Microscope - Prepared slides (Sporocysts Flukes and Tapeworm) - Video on flatworms Procedures: - We obtained two slides of ascaris and pinworm and examine its external features using a light microscope.
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