Zoology Flatworm Lab Name Hour

Zoology – Flatworm Lab Name Hour

Modified from the Perry and Morton Biology Laboratory Manual, Exercise 23 – Flatworms, Roundworms, and Rotifers beginning on page 301 in the lab manual. Follow the procedures in the lab book using the specimens listed below. Attach any written observations (clearly labeled), prelab and postlab questions

Procedure A. Class Turbellaria: Planarians Parts 1 & 2. Use a compound microscope and a prepared slide of Planaria digestive system (wm). Sketch and label (head, eyespots, auricles, pharynx, pharyngeal cavity, intestine) Part 3. Use the dissecting microscope to make observations of live planaria. Part 4. Use a compound microscope and a prepared slide of Planaria masson (cs). Sketch and label as per lab directions Parts 5, 6 & 7. Use a dissecting microscope and live planaria Procedure B. Class Trematoda: Flukes Part 1. Dissecting microscope, prepared slide of Fasciola hepatica. Sketch and label as directed Part 2. Compound microscope, prepared slide of Opisthorchis sinensis or Clonorchis sinensis. Sketch and label as directed Procedure C. Class Cestoda: Tapeworms Use appropriate microscopes as per directed with the prepared slides and specimens provided (Taenia pisiformis,

Do the prelab questions #1-5 on page 312 and the postlab questions 1-6 & 8 on page 313-314

Planaria Whole mount Planaria masson (cs)

Fasciola hepatica (wm) Opisthorchis or Clonorchis sinensis Taenia pisoformis

Prelab Questions

1. Cephalization is

a. The division of the trunk into a scolex, neck, and body

b. The presence of a head with sense organs

c. Sexual reproduction involving self-fertilization

d. The ability to replace lost body parts

2. Flatworms

a. Are radially symmetrical

b. Possess a body cavity

c. Reproduce by parthenogenesis d. Have tissues derived from all three primary germ layers

3. Free-living flatworms (planaria) move by using

a. Cilia

b. Flagella

c. Pseudopodia

d. A muscular foot

4. The flukes and tapeworm are covered by a protective

a. Cuticle

b. Shell

c. Scales

d. Slime layer

5. Tapeworms do not have a

a. Reproductive system

b. Head

c. Excretory system

d. Digestive system Postlab Questions

1. Define the following terms:

a. Acoelomate

b. Cephalization

c. Cloaca

d. Parthenogenesis

e. Intermediate host

2. Define the organ-system level of organization and indicate how flatworms exhibit this phenomenon.

3. In your own words, describe the characteristics of flatworms.

4. Compare the digestive systems of free-living flatworms and roundworms.

5. How is bilateral symmetry different from radial symmetry? 6. Describe several adaptations of parasitic flatworms to their external environment.

8. Identify and label this illustration.