Life cycle of thorn-headed worms (Macracanthorhynchus hirudinaceus) in swine diagram. Illustration in "Internal Parasites of Swine", Farmers' Bulletin 1787, 1961. Figure 18.

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Citation

E.B.F.. 1936. “Life cycle of thorn-headed worms (Macracanthorhynchus hirudinaceus) in swine diagram. Illustration in "Internal Parasites of Swine", Farmers' Bulletin 1787, 1961. Figure 18..” Special Collections, USDA National Agricultural Library. Accessed August 19, 2022, https://www.nal.usda.gov/exhibits/speccoll/items/show/8089.