In all, some fifteen species of animals parasitic upon Necturus have been reported. It is probable that none is exclusively a parasite of Necturus, for nearly all have also been reported from other animals.
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Harris, Joseph P. Jr.
"The Parasite of Necturus,"
Field and Laboratory: Vol. 22
Available at: https://scholar.smu.edu/fieldandlab/vol22/iss2/2