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Parasites of the greater shearwater (Puffinus gravis) from Newfoundland, Canada.

Two groups of ectoparasites (Mallophaga and Acarina) and two groups of helminths (Cestoda and Nematoda) were recovered from 49 Puffinus gravis collected off the coast of insular Newfoundland, in 1974 and 1975. Mallophagans of the genera Ancistrona, Austromenopon, Docophoroides, Halipeurus, Naubates, Saemundssonia, and Trabeculus, and acarines belonging to the genera Brephosceles, Microspalax, and Zachvatkinia were recovered. Of the 10 genera and 12 species collected, 3 genera (Docophoroides, Microspalax, Zachvatkinia) and 2 species (Saemundssonia peusi, Halipeurus diversus) had not previously been recorded on this host.Cestodes of the genus Tetrabothrius and nematodes of the genera Contracaecum, Seuratia, Stegophorus, Tetrameres, and the subfamily Dicheilonematinae were also obtained. Before this study no nematodes had been recovered from this host.Details of the degree of infestation of the birds are given, as well as the distribution of each ectoparasite species on the host.