Trichostrongylidae
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Haemonchus contortus
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♂ 10-20
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Red pseudocoelomic fluid and white coiled ovaries giving the appearance of a barber's pole.
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18-21
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Abomasum
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♀ 18-30
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Presence of vulvar flap depends on strain.
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Teladorsagia circumcincta
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♂ 7-8
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Small head and buccal cavity.
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15-21
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Abomasum
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♀ 10-12
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In females, a vulvar flap can be present.
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Trichostrongylus axei
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♂ 2-6
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Dissimilar spicules of unequal length.
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15-23
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Abomasum
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♀ 3-8
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or stomach
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T. colubriformis
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♂ 4-8
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Equal length spicules with triangular tip.
|
15-23
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Anterior small intestine
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♀ 5-9
|
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T. vitrinus
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♂ 4-7
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Equal length spicules with sharp tips.
|
15-23
|
Anterior small intestine
|
♀ 5-8
|
|
T. rugatus
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♂ 4-7
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Dissimilar spicules with foot-like appearance.
|
15-23
|
Small intestine
|
♀ 6-7
|
|
Cooperia curticei
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♂ 4-5
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Transverse striation of cuticle in all species.
|
14-15
|
Small intestine
|
♀ 5-6
|
Watch-spring-like body posture and presence
|
a small cephalic vesicle are characteristic.
|
Molineidae
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Nematodirus spathiger
|
♂ 10-19
|
Small but distinct cephalic vesicle.
|
18
|
Small intestine
|
♀ 15-29
|
Very long spicules ending in a
|
spoon-shaped terminal piece.
|
N. filicollis
|
♂ 10-15
|
Small but distinct cephalic vesicle.
|
18
|
Small intestine
|
♀ 15-20
|
Long and slender spicules with a
|
narrow, lanceolate membrane.
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Ancylostomatidae
|
Bunostomum trigonocephalum
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♂ 12-17
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Anterior end is bend dorsally,
|
40-70
|
Small intestine
|
♀ 19-26
|
Buccal capsule with two cutting plates.
|
Chabertiidae
|
Oesophagostomum columbianum
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♂ 12-16
|
Have two leaf crowns and a shallow
|
40-45
|
Large Intestine
|
♀ 14-18
|
buccal capsule. Position of cervical papillae
|
used for species differentiation.
|
O. venulosum
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♂ 11-16
|
Cervical papillae are situated
|
40-45
|
Large intestine
|
♀ 13-24
|
posterior to the oesophagus.
|
Chabertia ovina
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♂ 13-14
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Mouth is directed antero-ventrally.
|
42-50
|
Large intestine
|
♀ 17-20
|
Buccal capsule is subglobular
|
|
|
|
without teeth. |
|
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