''Dictyocaulus viviparus'' is a species of

nematodes The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant-parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broa ...

belonging to the family Dictyocaulidae. The species has

cosmopolitan distribution In biogeography, cosmopolitan distribution is the term for the range of a taxon that extends across all or most of the world in appropriate habitats. Such a taxon, usually a species, is said to exhibit cosmopolitanism or cosmopolitism. The ext ...

. It is parasitic, and has the common name of the bovine lungworm due to its negative impact on cattle.

References

Strongylida Nematodes described in 1782 Parasitic nematodes of mammals {{Rhabditida-stub