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Biology LibreTexts


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