Abstract

SUMMARYThe migration, growth and development of Cyclocoelum oculeum Kossack, 1911 was studied in orally and parenterally exposed coots, Fulica americana (Gm.). Young flukes injected into the body cavity migrate to the sinuses from the body cavity via the air sacs and air passages. Young flukes were first found in the trachea on day 18 post-infection and in the sinuses on day 21. Migration was not synchronous and some flukes were found in the air sacs and trachea of parenterally exposed coots up to 45 days post-infection. Exponential growth and organogenesis began between days 9 and 12. Flukes in the sinuses were consistently larger than flukes of the same age in either the air sacs or trachea. Growth and organogenesis proceeded in the latter flukes but at a slower rate than those in the sinuses.

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