Strongylus
a genus of nematoid worms belonging to the family Strongylidæ, of which this genus is the type. The S. bronchialis is a species infesting the bronchial tubes of man, the female attaining the length of an inch. The family characteristics of this group are a round thread-like body (hence the name), a round or oval mouth, and two terminal spicules provided for the male.
The S. bronchialis is not of frequent occurrence as a human parasite. It was first discovered in 1790. Allied species pig, and (S. micrurus) in those of the Eustrongylus gigas) is notable as being the largest nematoid parasite found in man or other animals. It attains a length of over 3 feet (female), the male measuring 1 foot. Rare in man, S. gigas is found in almost all Carnivora. Rare in man,