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=== Small strongyles (Cyathostomins) ===
===Introduction===
Cyathostomins are a group of '''small strongyles'''. The majority of cyathostomins are similar in terms of both morphology and behaviour. There are over 50 different species of small equine strongyle, and they are of huge significance throughout the United Kingdom. They commonly cause severe acute diarrhoea and colic.
==== Morphology ====
==== Morphology ====
'''Gross''':
'''Gross''':
==== Life-cycle ====
==== Life-cycle ====
L1-L3 occurs within the envelope. The L3 then exits the sheath in the small intestine, and then concentrates within the '''Lieberkuhn's gland'''. At this stage they are known as EL3, and have two potential options. Firstly, they may either become hypobiotic, remaining dormant for several months to years. This usually occurs Autumn-Winter.
Or they may evolve directly and emerge 8-10 weeks later as LL3. They will then evolve into L4, at which stage they will emerge from a nodule.
*Infection by ingestion of L3
*Infection by ingestion of L3
*Larvae invade mucosa of large intestine
*Larvae invade mucosa of large intestine