vpg logo Parasite Diagnostic Key
Equine

1. Egg with a rough shell .......... Go to: 3 & 4
2. Egg with a smooth shell .......... Go to: 5 & 6

3. Angular egg (D-shaped or square) .......... Anoplocephala sp.
4. Round to oval egg .......... Parascaris equorum

5. Egg with a single plug .......... Oxyuris equi
6. Egg withOUT a plug .......... Go to: 7 & 8

7. Embryonated or larvated egg .......... Strongyloides westeri
8. Morulated egg .......... Strongyle-type Egg

Parascaris sp. ova


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NC State College of Veterinary Medicine
1060 William Moore Drive
Raleigh, NC 27607