Changes

== General Appearance ==

== General Appearance ==

[[Image:Trichostrongylus.jpg|thumb|right|150px|''Trichostrongylus'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]

[[Image:Trichostrongylus.jpg|thumb|right|150px|''Trichostrongylus'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]

*Bursate.

*Bursate

*Most members of this superfamily will look like short lengths of cotton (typically 0.5-2cm).

*Most members of this superfamily look like short lengths of cotton (typically 0.5-2cm)

*The spicules of each species have a characteristic shape.

*The spicules of each species have a characteristic shape

*The heads have no distinct features.

*The heads have no distinct features

 

== General Life-Cycle ==

== General Life-Cycle ==

*The egg is approximately 80µm long, oval, thin-shelled, contains 4-16cells (i.e. it is a typical strongyle egg).

*The egg is approximately 80µm long, oval, thin-shelled, contains 4-16cells (i.e. it is a typical strongyle egg)

*Egg → L1 → L2 → L3 (this occurs on the ground).

*Egg → L1 → L2 → L3 (this occurs on the ground)

*The L1 and L2 feed on bacteria.

*L1 and L2 feed on bacteria

*The L3 is the infective stage.

*L3 is the infective stage

*The L3 is ensheathed (i.e. the L2 cuticle is retained after moulting as an "outer skin").

*L3 is ensheathed (i.e. the L2 cuticle is retained after moulting as an "outer skin")

*The L3 cannot feed, but has a finite amount of food stored to provide energy for movement.

*L3 cannot feed, but contains a finite amount of stored food to provide energy for movement

*Infection is by ingestion of the L3.

*Infection is by ingestion of the L3

*L3 → L4 → adult (this occurs in the stomach or small intestine).

*L3 → L4 → adult (this occurs in the stomach or small intestine)

*Parasitic development initially occurs in gastric glands or intestinal crypts (depending on species).

*Parasitic development initially occurs in gastric glands or intestinal crypts (depending on species)

*Adults are on the mucosal surface.

*Adults are situated on the mucosal surface  

*The prepatent period is typically about 3weeks.

*The prepatent period is typically about 3 weeks

 

 

 

[[Nematodirus]]

[[Nematodirus]]