Bursate Nematodes 1 Flashcards
Bursate Nematodes
Order Strongylidae
Order Strongylidae
Trichostrongyloidea (Trichostrongyles) - direct life cycles GIT ruminants
Metastrongyloidea (Metastrongyles) - indirect life cycles (mostly) lungworms
Strongyloidea (Stronglyes) - direct life cycles GIT horses
Trichostrongyloidea
Slender, hair-like
Only require one host
Metastraingyloidea
Slightly more “stout”
Indirect lifecycle, require 2 hosts (intermediate host is typically and invertebrate)
Strongyloidea
Well developed buccal capsule
Direct life cycle (only one host)
Typical trichostrongyle lifecycle summary:
Eggs are released in fecal material from infected host hang on the pasture and larvae develop within the egg (L1), larvae emerges from the egg and travels and undergoes a molt (L2), develops into L3 larva through another molt, L3 is the only stage capable of initiating new infection in the new host, L4 and L5 are within the host, L5 matures to become an adult worm
Typical trichostronglye eggs morphology:
You can’t tell much by looking at the egg, only “typical stronglye eggs”
Are typical trichostronglye eggs embryonated when passed in the feces?
No, they are unembryonated
Which lifecycle stages occur in the environment for typical trichostrongyles?
Egg, L1, L2, L3 occur on the pasture
Which lifecycle stage of the trichostronglye is infective?
Only L3 is infective
What appearance does the typical trichostrongyle have?
Retains the L2 cuticle - wrinkled appearance
Trichostronglyes in Domestic Animals:
Genus: Ostertagia
Host: PGE in cattle
Trichostronglyes in Domestic Animals:
Genus: Teladorsagia
Host: PGE sheep
Trichostronglyes in Domestic Animals:
Genus: Haemonchus
Host: Cattle and small ruminants
Trichostronglyes in Domestic Animals:
Genus: Trichostrongylus
Host: Small ruminants (others)
