Strongylus vulgaris, commonly known as the blood worm, is a common horse parasite in the phylum Nematoda. It generally lives in the large intestine with larvae that migrate into the mesenteric arteries. This nematode is considered to be one of the "most pathogenic" of the large strongyles subphylum and is distributed worldwide, wherever there are grassland and temperate environment.
Attributes / relations provided by ♦1Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London ♦2Nunn, C. L., and S. Altizer. 2005. The Global Mammal Parasite Database: An Online Resource for Infectious Disease Records in Wild Primates. Evolutionary Anthroplogy 14:1-2.