Wikipedia
Subuluridae
Subuluridae is a family of spirurian nematodes which, together with the two species of Maupasinidae, make up the superfamily Subuluroidea. Like all nematodes, they have neither a circulatory nor a respiratory system.
They number about one dozen genera and somewhat over 100 species, and are parasites of amniotes, chiefly birds and mammals.