Exam II - Gasterophilus spp Flashcards
What is the common name for Gasterophilus spp?
Bot fly larvae, bot fly
How do you differentiate between Gasterophilus intestinalis and Gasterophilus nasalis?
color and spines
Where are Gasterophilus intestinalis eggs deposited?
on hair of forelegs and shoulder
**This site is species specific
Describe the general life cycle for Gasterophilus spp
Eggs are deposited. First instar hatches from egg when licked by horse and attaches to tongue/lips.
Development to second instars occurs in the oral cavity, then they are swallowed. They develop to third instars (or “bots”) and these live for up to a year in the stomach or duodenal ampulla (depending on the species).
From late spring, these will pass out with the feces to pupat in the soil. Adult bot flies emerge 3-9 weeks later.
Complete life cycle can take up to 14 months
Describe the appearance of Gasterophilus intestinalis and Gasterophilus nasalis third instars
- Gasterophilus intestinalis*: red, with 2 rows of coarse spines blunted on ends
- Gasterophilus nasalis*: yellow with 1 row of spines on each segment
What is the site of infestation for the Gasterophilus intestinalis 3rd instar?
stomach
What is the site of infestation for the Gasterophilus nasalis 3rd instar?
small intestine
Describe any pathogenesis associated with Gasterophilus spp
Adult flies are an annoyance. Attached instars can provoke an inflammatory reaction
What clinical signs do we see associated with Gasterophilus spp?
fly worry
Describe treatment & prevention options for Gasterophilus spp
Manual removal of eggs. Endoparasiticides for larval stages
Where does the Gasterophilus spp. L1 develop to L2?
In the mouth
