We redescribe Andrya octodonensis based on new material from Phyllotis xanthopygus from Argentina. Andrya vesicula n. sp. from Phyllotis xanthopygus and Andrya boliviensis n. sp. from Phyllotis osliae are also described and illustrated. The occurrence of these species in South America suggests that cestodes of the genus Andrya were introduced on that continent by sigmodontine rodents from the Nearctic, probably after the formation of the Isthmus of Panama.
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Vol. 77 • No. 2