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Biology 03050, Invertebrate Zoology

Handout for Laboratory 6: PLATYHELMINTHS

Lab manual: Hickman et al., 9th ed., Exercise 10, pp. 143-162


WORD BANK (terms that you are responsible for):

  1. acoelomate
  • anterior
  • auricle (sensory lobe)
  • cercaria, -ae
  • cilia
  • Clonorchis (Chinese liver fluke), Class Trematoda
  • cysticercus ("bladder worm")
  • diverticula (branches of gut)
  • gastrovascular cavity)
  • dorsal
  • epidermis
  • excretory canal
  • eye
  • fluke, Class Trematoda
  • gastrodermis
  • gastrovascular cavity (gut)
  • genital pore
  • hooks
  • intestine
  • lateral
  • miracidium, -a
  • mouth
  • muscle layer
  • neck (germinative zone)
  • nerve cord
  • oral sucker
  • ovary
  • parenchyma
  • pharyngeal cavity
  • pharynx
  • planarian (free-living flatworm), Class Turbellaria
  • posterior
  • proglottid
  • redia, -ae
  • Schistosoma (blood fluke), Class Trematoda, male vs. female
  • scolex
  • seminal receptacle
  • skin pigmentation
  • sporocyst
  • strobila (body)
  • suckers
  • tapeworm, Class Cestoda
  • tegument
  • testis
  • uterus
  • vagina
  • vas deferens
  • ventral
  • ventral sucker (acetabulum)
  • yolk gland
  • Using your lab manual for guidance, perform those parts of Exercise 10 listed below:

    1. Read the introduction to the phylum on pp. 143-144.
    2. Exercise 10A: Class Turbellaria--the planarians. Examine the live planarian: its external features and its behavioral response to touch and light. Return the planarian to the jar upon completion. Also examine prepared whole mount (injected vs. plain) and transverse section slides for additional details on the terms listed above.
    3. Exercise 10B: Class Trematoda--the flukes. Examine a prepared slide of Clonorchis, the Chinese liver fluke, to highlight the structures on the word list. What is its life cycle? Also, examine the life cycle stages of the important parasite Schistosoma, the blood fluke. How does its life cycle vary from that of the liver fluke? How do people become infected?
    4. Exercise 10C: Class Cestoda--the tapeworms. Examine a prepared slide or whole mount of a tapeworm, recognizing major structures listed in the word bank above. In addition, examine a jarred specimen to get a full"flavor" of these organisms. Where do adult tapeworms live? How do they get there as part of their life cycle? How do people become infected by tapeworms--note the cysticerci of Taenia solium, the pork tapeworm, as part of your answer.

    Your instructor may base homework and/or quizzes on questions posed in this handout or in the assigned reading.

    ADDITONAL NOTES AND DRAWINGS: (below and on back)


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    This page updated October 8, 1999