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Haemonchus is a genus which includes the species; Haemonchus placei, also known as H. contortus, H. similis, and H. longistipes.

''Haemonchus'' is a genus which includes the species; ''Haemonchus placei'', also known as ''H. contortus, H. similis,'' and ''H. longistipes''.

Haemonchus contortus is by far currently the most prevalent species under the Haemonchus genus, and seen commonly within the UK. The other two are of importance within the UK, but to a lesser extent.

''Haemonchus contortus'' is by far currently the most prevalent species under the ''Haemonchus'' genus, and seen commonly within the UK. The other two are of importance within the UK, but to a lesser extent.

'''Scientific Classification'''

'''Scientific Classification'''

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| Species

| Species

| '''H. Contortus/ H. placei, H. Longistipes, H. similis'''

| '''''H. Contortus/ H. placei, H. Longistipes, H. similis'''''

|}

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===Haemonchus contortus===

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

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| Also known as:

| Also known as:

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| Predilection site

| Predilection site

|'''Abomasum.

|'''Abomasum

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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 anthelemintics 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.

===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===