Notes on the Gapeworms (Nematoda: Syngamidae) of Galliform and Passeriform Birds in New York State

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Abstract
The incidence of gapeworms (genus Syngamus) in several spp. of galliform and passeriform birds in New York State is given. Records of S. trachea from meadowlarks and bronzed grackles are probably new. The parasite was also found in crows, ruffed grouse and ringnecked pheasants. Data indicate significantly higher incidences in juveniles than in adults. Observations were made on the size of infections and the pathological effects of the parasites on their hosts. The morphology and identity of the parasites were discussed. The form occurring in robins was considered to be S. merulae rather than S. trachea; the latter species occurred in all the other hosts mentioned above. S. tenui-spiculum is considered to be a synonym of S. merulae, and S. gracilis is probably a synonym of S. trachea. A key to the spp. of Syngamus in galliform and passeriform birds is given.

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