Macracanthorhynchus hirudinaceus

Mac·ra·can·tho·rhyn·chus hir·u·di·na·'ce·us

the giant thorny-headed worm of the pig, approximately the size of the giant roundworm (Ascaris); it inhabits the intestinal tract where nodules develop at the site of penetration of the spiny proboscis of each worm; it has occasionally been reported in humans; transmission is by ingestion of infected insects, frequently dung beetles or cockroaches that have fed on feces of infected pigs containing viable eggs and have then developed the cystacanth stage infective to the vertebrate host, including humans.

Macracanthorhynchus

a genus of large acanthocephalans in the family Oligacanthorhynchidae.

Macracanthorhynchus catalinum
found in the small intestine of dogs, wolves, badgers and foxes.
Macracanthorhynchus hirudinaceus
found in the small intestine of domestic and wild pigs, where they cause granulomatous lesions in the intestinal wall, sometimes perforation and peritonitis.
Macracanthorhynchus ingens
found in the small intestine of wild mammals including skunk, mink, raccoon and mole.
Enlarge picture
Macracanthorhynchus ingens proboscis. By permission from Bowman DD, Georgis' Parasitology for Veterinarians 8E, Saunders, 2002
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For yet another, Macracanthorhynchus hirudinaceus, there is no effective treatment.