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Biology LibreTexts


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  • This laboratory exercise covers the following animals. You should learn this classification scheme and be able to classify the animals into these categories.

    Phylum: Platyhelminthes (Flatworms)

    Class: Turbellaria (planarians)

    Class: Trematoda (Flukes)

    Class: Cestoda (Tapeworms)

    Read "Flatworms" in the lecture notes.


    1. Place a living planarian on a watch glass and observe its movements under a dissecting microscope. Look for the eyespots, auricles, gastrovascular cavity, and pharynx.

    Click here: VIDEO - Planarian movement

    2. Planarians cannot see images but they can tell the direction of light with their eyespots. Cover 1/2 of the watch glass with aluminum foil. Does the planarian favor the light area or the dark area?

    3. View a slide of a preserved planarian and note the eyespots, auricles, gastrovascular cavity, and pharynx.

    Planarian anterior end X 40 Planaria digestive tract
    mid section X 40
    Planarian c.s. X 40

    Liver Flukes

    Observe either a preserved liver fluke or a slide of a liver fluke using a dissecting microscope.

    Sheep liver fluke (Fasciola
    ) stained
    Liver fluke (preserved)


    1. View a preserved tapeworm (Taenia).

    Taenia (preserved)

    2. View slides of Taenia. Locate the scolex. View a gravid (filled with eggs) proglottid.

    Taenia pisiformis
    anterior end.
    Taenia pisiformis
    mid regiion
    Taenia pisiformis
    posterior end
    Taenia scolex X 40 Taenia solum gravid segment