Changes

L1 are extremely small and motile, and begin development in the mouth, tongue and gums of the host.  The development of L1 into L2 occurs on the pharynx.  L2 then attaches to the base of the tongue and slowly migrates to the stomach.

L1 are extremely small and motile, and begin development in the mouth, tongue and gums of the host.  The development of L1 into L2 occurs on the pharynx.  L2 then attaches to the base of the tongue and slowly migrates to the stomach.

L3 attaches to the squamous gastric mucosa along the margo pliacatus, in the case of ''G. intestinalis''. ''G. nasalis'' attaches to the dorsoproximal part of the duodenum, and ''G. haemorrhoidalis'' attaches to the gastric epithelium within the stomach.

L3 attaches to the squamous gastric mucosa along the margo plicatus, in the case of ''G. intestinalis''. ''G. nasalis'' attaches to the dorsoproximal part of the duodenum, and ''G. haemorrhoidalis'' attaches to the gastric epithelium within the stomach.

The larvae then remain and develop within the stomach for around 10-12 months.  They mature in the following spring or early summer (generally between May and September), detach from their surface and are passed out in the host faeces. ''G. haemorrhoidalis'' also attaches to the rectal mucosa before being passed out.

The larvae then remain and develop within the stomach for around 10-12 months.  They mature in the following spring or early summer (generally between May and September), detach from their surface and are passed out in the host faeces. ''G. haemorrhoidalis'' also attaches to the rectal mucosa before being passed out.