Phylum Acanthocephala (Horny-Headed Worms, or Spiny-Headed Worms)
Approximate Number of Species: 1100
Largest: Macracanthorhyncus hirudinaceus at a length of 25.59 inches (650 mm). M. hirudinaceus is intestinal parasite commonly found in pigs and thus often referred to as the “Giant Thorny-Headed Worm of Swine”.
Smallest: Males of Octospiniferoides chandleri obtain lengths of only 0.039 inches (1 mm)
B. Nickol, personal communication
Bullock WL (1967) Octospiniferoides chandleri n. gen., n. sp. a neoechinorhynchid from Fundulus grandis Baird and Girand on the Texas Coast. Journal of Parasitology 58:290-297
Brusca RC & Brusca GJ (2003) Invertebrates (Sinauer Associates, Inc., Publishers, Sunderland, MA) 2nd Ed.