Difference between revisions of "Category:Strongyloidea"

General Appearance

Strongylus - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona

Strongyloid nematodes share a a number of morphological features. They are bursate, meaning that the males have a copulatory bursa. They are realtively short, typically 1 - 5mm, but stout in appearance with a large buccal capsule at the anterior end. The head or anterior also usually carries characteristic features such as teeth or cutting plates.

General Life-Cycle

The life cycle of the strongyloids is typical of most nematodes. The L3 to adult development occurs in the large intestine where the L3 larvae penetrate the mucosal wall and form nodules. Some strongyle species larvae have a migratory life cycle in which they travel through body organs before returning to the large intestine of the host.

• Like that of the trichostrongyloids (eggs are also 'typical strongyle eggs'), but:
  • L3 → L4 → adult (typically occurs in the large intestine)
  • Larvae penetrate the mucosal wall and elicit nodule formation
  • Larvae of some species migrate around the body
  • Prepatent period varies between species from 3 weeks to over 6 months

Strongylus vulgaris

Peritonitis in sheep by penetration of intestines by larvae of Oesophagostomum columbianum

Strongylus edentatus and Strongylus equinus migrate through Peritoneal Cavity - Parasitic Pathology

Stephanuris dentatus causes peritonitis in pigs Peritoneal Cavity - Parasitic Pathology and may cause cysts in the pancreas

Syngamus laryngeus