1. Round to Oval egg with a rough shell ........ Ascaris suum
2. Oval to ellipsoid egg / oocyst with a smooth shell ........ Go to: 3 & 4

3. Egg with bi-polar plugs .......... Trichuris suis
4. Egg / oocyst withOUT bi-polar plugs ........ Go to: 5, 6, & 7

5. Single-celled oocyst .......... Coccidea*
* Coccidea -- sporulate to determine Isospora sp. [2 sporocysts] or Eimeria sp. [4 sporocysts]

6. Embryonated or larvated egg .......... Strongyloides ransomi
7. Morulated egg .......... Strongyle-type Egg