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Review of distribution and taxonomy of Haematopus species reveals species distinctions, suggesting taxonomy testing.
Basic information on the distribution of members of the genus Haematopus is reviewed and the taxonomy of the group is discussed. The distinctions between species and subspecies are stressed and applied to the classification of oystercatchers; alternative taxonomic rank is suggested for some forms, but the ideas require testing in the field.
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P. B. Heppleston (1973) studied this question.
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