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01:146:329 Lecture Notes - Lecture 2: Trematode Life Cycle Stages, Apicomplexan Life Cycle, TrematodaExam


Department
Cell Biology and Neuroscience
Course Code
01:146:329
Professor
A.Keating
Study Guide
Final

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Lab 2: Larval Trematodes
-With the exception of the schistosomes, these parasites have complex life cycles with two
intermediate hosts.
-In general, the adults pass eggs through the feces of the definitive host.
A. Egg
B. Miracidium
C. Sporocysts
D. Redia
E. Cercaria
F. Metacercaria

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A. Egg
-Contain a developing embryo and generally have an operculum at one end through which the larva
escapes
-Development of eggs in the external environment is usually dependent on specific conditions
1. The egg shell of most trematodes has an _____ through which the _____ escapes.
2. How can the eggs of Clonorchis sinensis and Fasciola hepatica be differentiated?
3. Draw the eggs of the three schistosome species which infect humans.

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B. Miracidium
-Ciliated (allows for mobility in the environment)
-Two eyespots in the anterior region
-Undifferentiated masses of germinal tissue called germ balls in the center of the poster region
1. Draw and label a representative specimen.
2. What host will be infected by this larval stage?
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