Page 164 - The Veterinary Laboratory and Field Manual 3rd Edition

Parasitology 133

Table 3.4 The classification of nematodes of veterinary importance.

Superfamily Genus Comments
Trichostrongyloidea Ostertagia /Teladorsagia Abomasal parasite of ruminants.
(Thread like worms– Haemonchus Abomasal parasite, may cause anaemia in
‘strongyles’) sheep.

Trichostrongylus Intestinal parasite, causes enteritis in
herbivores.
Cooperia Enteritis in ruminants.
Nematodirus Enteritis, young sheep, occasionally
cattle.
Hyostrongylus Stomach worm of pigs, gastritis.
Dictyocaulus Lungworm of ruminants and horses,
coughing.
Strongyloidea Strongylus Small and large ‘red worms’ in
horses, enteritis colic and other
complications.
Cyathostomum (Trichonema) Caecal worm of horse and ruminants.
Chabertia Colitis in ruminants.
Oesophagostomum Caecal/colon worm of ruminants.

Syngamus Tracheal worm in birds, causes
‘gapes’, may result in asphyxiation.
Stephanurus Kidney worm in pigs, urinary tract
infection.
Ancylostomatoidea Ancyclostoma, Uncinaria Hookworms of carnivores, these species live in
the small intestine,
infective larvae penetrate the skin
causing dermatitis, ZOONOTIC
(cutaneous larva migrans).
Bunostomum Hookworm of ruminants, enteritis.
Metastrongyloidea Metastrongylus Lungworm in pigs, indirect life cycle, causes
coughing.
Muellerius Lungworm in sheep, indirect life
cycle (mollusc intermediate host),
coughing.
Filaroides, Aelurostrongylus Lungworm in dogs and cats respectively,
complex life cycle requires mollusk or annelid
intermediate host and can include other hosts.
Rhabditoidea Strongyloides Small intestine of mammals, enteritis.
Ascaridoidea Ascaridia, Heterakis Poultry, enteritis & death.
(large nematodes, Ascaris, Parascaris Ascarids, young animals, enteritis.
cause, blockage of
intestine) Toxocara Weight loss and death. Toxocara
canis, zoonotic (Visceral larva migrans).

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