1. Eggs found in the mucus, sputum, tracheal wash or feces of cats ........ Go to: 3 & 4
2. Tapeworm proglottids in the feces of a cat .......... Go to: 11, 12 & 13

3. Eggs found in the mucus, sputum, tracheal wash of cat. Eggs are brownish, with an operculum that is clearly visible due to the opercular rim. ........ Paragonimus kellicotti
4. Eggs in the feces of cats ........ Go to: 5 & 6

5. Eggs with an operculum ........ Go to: 7 & 8
6. Eggs without an operculum ........ Go to: 9 & 10

7. Eggs are large, brownish, with an operculum that is clearly visible due to the opercular rim. ........ Paragonimus kellicotti
8. Eggs are small, clear to lightly brownish, with an operculum that lacks an opercular rim. ........ Spirometra spp.

9. Eggs are spherical with a "radiant" or striated shell ........ Taenia sp. or Echinococcus sp.
10. Many spherical ova contained within an egg packet ........ Dipylidium caninum

11. Proglottid oval or "cucumber seed"-shaped. Rehydration and segment squash reveals egg packets. ........ Dipylidium caninum
12. Proglottid square or rectangular. Rehydration and segment squash reveals spherical eggs. .......... Taenia pisiformis
12. Proglottid small ova, and "sesame seed"-shaped. Rehydration and segment squash reveals a parauterine body. .......... Mesocestoides spp.