Changes

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| Phylum

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| Nematoda

| [[:Category:Nematodes|Nematoda]]

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| Family

| Family

| Trichostrongyloidea

| [[:Category:Trichostrongyloidea|Trichostrongyloidea]]

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| Genus

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=='''Haemonchus contortus'''==

==''Haemonchus contortus''==

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==Introduction==

===Introduction===

''Haemonchus contortus'' is a nematode parasite from the family '''Trichostrongyloidea.''' It is found worldwide, and is an extremely important parasite of sheep and goats, particularly in tropical/ subtropical regions.   

''Haemonchus contortus'' is a nematode parasite from the family '''Trichostrongyloidea.''' It is found worldwide, and is an extremely important parasite of sheep and goats, particularly in tropical/ subtropical regions.   

Within the UK, it is found most commonly in the South, where the climate tends to be a little warmer and drier.  Some have shown complete resistance to current anthelmintics which is posing a real problem, making sheep and goat farming extremely difficult in some areas of the country.

Within the UK, it is found most commonly in the South, where the climate tends to be a little warmer and drier.  Some have shown complete resistance to current anthelmintics which is posing a real problem, making sheep and goat farming extremely difficult in some areas of the country.

==Identification==

===Identification===

The eggs are yellow, and approximately 70–85 μm long by 44 μm wide. The adult female is 18–30 mm and is easily recognized by its distinct “barber pole” coloration. The female has a red and while appearance, the red is due to the fact it is a blood feeder, and the white represents the ovaries coiled around the blood filled intestines.   

The eggs are yellow, and approximately 70–85 μm long by 44 μm wide. The adult female is 18–30 mm and is easily recognized by its distinct “barber pole” coloration. The female has a red and while appearance, the red is due to the fact it is a blood feeder, and the white represents the ovaries coiled around the blood filled intestines.   

The male adult worm is considerably smaller than the female, and is around 10–20 mm. It holds a characteristic copulatory bursa, which is an important diagnostic aid.

The male adult worm is considerably smaller than the female, and is around 10–20 mm. It holds a characteristic copulatory bursa, which is an important diagnostic aid.

==Hosts==

===Hosts===

''H. contortus'' is a direct parasite, therefore, it only occupies definitive hosts, namely; Sheep, cattle, goats, deer, camels, and llama.

''H. contortus'' is a direct parasite, therefore, it only occupies definitive hosts, namely; Sheep, cattle, goats, deer, camels, and llama.

==Life Cycle==

===Life Cycle===

This life cycle is direct, and very much typical of a [[Trichostrongyloidea - Overview|trichostrongyloid]].

This life cycle is direct, and very much typical of a [[Trichostrongyloidea - Overview|trichostrongyloid]].

Eggs are subsequently shed onto pasture by the host within 3 weeks of infection, and the life cycle continues.

Eggs are subsequently shed onto pasture by the host within 3 weeks of infection, and the life cycle continues.

=='''Haemonchus longistipes'''==

==''Haemonchus longistipes''==

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==Hosts==

===Hosts===

Camel

Camel

==Life Cycle==

===Life Cycle===

As for ''H. contortus.''

As for ''H. contortus.''

==Identification==

===Identification===

These are relatively small worms, with the males being around 10-20mm, and the females 18-30mm.

These are relatively small worms, with the males being around 10-20mm, and the females 18-30mm.

=='''Haemonchus similis'''==

==''Haemonchus similis''==

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==Identification==

===Identification===

The adults are red in colour and around 2-3 cm in length.

The adults are red in colour and around 2-3 cm in length.

The male has a dorsal lobe, which is longer than those seen in ''H. contortus''. He also has barbed spicules, which are shorter than in ''H. contortus''.

The male has a dorsal lobe, which is longer than those seen in ''H. contortus''. He also has barbed spicules, which are shorter than in ''H. contortus''.

==Life Cycle==

===Life Cycle===

As for ''H. contortus.''

As for ''H. contortus.''