During a survey of the helminth parasites of the introduced toad, Bufo marinus, on
O'ahu, Hawaii, an acanthocephalan corresponding to Acanthocephalus bufonis (Shipley,
1903) was found in the intestinal tract. This is a new host and locality record for
A. bufonis which has only previously been recorded from amphibians in the Orient.
Possible mechanisms for the introduction of A. bufonis to Hawaii, and its transmission
to the toad, are discussed. Almost 98% of toads were infected with a mean intensity
of 28.6 acanthocephalans per infected toad. There was a significant negative correlation
between host length and intensity of infection with subadult toads having significantly
higher infection levels than adult male and female toads. Trunk length of both male
and female acanthocephalans was significantly related to host length.