The
genus of thread-necked or thin-necked trichostrongyles; slender, relatively elongated nematodes occurring in
herbivorous animals, generally in the
little intestine.
Generally, they are not believed to be highly
pathogenic except in poorly fed, heavily
infected animals. Species include:
Nematodirus abnormalis,
general in the U.S. And occurring in sheep, goats, camels, and
mule deer.
Nematodirus filicollis, occurring worldwide in sheep, goats, oxen, and different
wild ruminants.
Nematodirus helvetianus, in cattle, sheep, goats, and camels in Europe, Asia, and the Americas.
Nematodirus lanceolatus, in
sheep and pronghorns in the Americas.
Nematodirus leporis, in
domestic rabbits and
wild cottontail rabbits in North America.
Nematodirus spathiger, the most general, widespread, and
abundant species, in sheep, cattle, camels, and another ruminants.