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Published online by Cambridge University Press: 06 April 2009
In 1814 Rudolphi described, under the name of Amphistomum subtriquetrum, a fluke from the caecum of the European beaver (Castor fiber). Little of importance was added for many years; i.e., until 1897, when Otto described it somewhat fully including its internal anatomy, and 1901 and 1903, when Fischoeder wrote of it in his classical revision of the Amphistomidae. In 1914 Duff described a similar parasite, this time from the American beaver (Castor fiber canadensis) which she believes to be identical with that of the European animal.