Observations on the Morphology and Life Cycle of Strigea elegans Chandler & Rausch, 1947 (Trematoda: Strigeidae)

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Abstract
The adult stage is described from a new host, the snowy owl (Nyctea nyctea), and cercaria, mesocercaria, and tetracotyle are described from experimental hosts. In the experimental life cycle, the first intermediate host was a freshwater snail, Gyraulus parvus; the second intermediate hosts, in which the unencysted mesocercaria occurred, were tadpoles of Rana sylvatica, R. clamitans, and Bufo americanus; the third intermediate hosts, in which the encysted, encapsulated tetracotyle occurred, were garter snake (Thamnophis sirtalis), domestic duck, and apparently the great horned owl(Bubo virginianus), a known final host. Thus the life cycle appears to require 4 hosts. Route of emergence of cercariae from the snail and migration of mesocercariae during metamorphosis of the tadpole are described.
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