Atlas of livestock parasites
digitized collection of microscopical preparations

Atlas of Parasites Contents Information sources Glossary Administration

Nematodirus spp.

Category:


Species:
Endoparasite


Description:
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Nematode (order Strongylida)

"thread-necked worm"              

Distribution: worldwide.   

Host: Several species are found in the small intestine of ruminants and camelids.  

Life Cycle: Unlike most other strongylids, larvae develop to the infective stage within the egg. Ruminants are infected when they ingest the hatched infective larvae.             

Diagnosis: Large eggs present in routine or quantitative fecal fotation exams.         

Size: 152–260 × 67–120 µm, depending on species (a similar egg is produced by Marshallagia  marshalli, a parasite of sheep).    

Clinical features: Most species of Nematodirus do not usually cause clinical disease.  Nematodirus battus, however, is an important cause of lamb diarrhea in some parts of the world. Nematodirus infections may cause disease in young camelids.


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