Life History of Echinostoma barbosai sp. n. (Trematoda: Echinostomatidae)

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Abstract
The life cycle of Echinostoma barbosai, a new Brazilian species with 37 collar spines, has been completed experimentally. The planorbid snails Biomphalaria glabrata, B. tenagophila, and B. straminea serve as experimental first intermediate hosts. Sporocysts develop in the heart. First-generation rediae, when they remain in the heart cavity, produce rediae only; those passing to the viscera also produce cercariae. There are three or more redial generations. The same species of snails serve as second intermediate hosts, metacercariae being found in the pericardial sac and posterior part of the kidney. Adult worms are experimentally obtainable from chicks, ducklings, and pigeons. The natural host is unknown.

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