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1 American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, and the Marine Biological Laboratory, Woods Hole, Massachusetts 02543
Metacercariae, encysted in the abdominal muscles of the common prawn, Palaemonetes vulgaris, taken in Quissett harbor near Woods Hole, Massachusetts, developed to maturity in recently-hatched gulls, Larus argentatus. The worms are identified as Odhnera odhneri Travassos, 1921. Sporocysts and microphallid cercariae were found in Littorina saxatilis at Quissett. The cercariae were ingested by small P. vulgaris that had been isolated in the laboratory for over two months and encysted metacercariae were recovered that proved identical with others of natural infections. Stages in the life-cycle are described. Data from seasonal infections indicate a one-year life-cycle of the parasite. Systematic and taxonomic relations of Odhneria odhneri are discussed.
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