1. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 1 Pathogenic Classification & Life Cycles of Common Parasites Lifecycle of the Roundworm Eggs passed out of body through feces. Eggs hatch on the ground & are eaten by an animal. The larvae penetrate the intestinal wall. Enter intestine

2. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 2 Pathogenic Classification & Life Cycles of Common Parasites Larvae move through blood to the liver. Larvae grow & develop in lungs. Enter bloodstream Enter lungs

3. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 3 Pathogenic Classification & Life Cycles of Common Parasites Larvae are coughed up, re-swallowed, & return to intestines. Larvae mature & reproduce.

4. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 4 Pathogenic Classification & Life Cycles of Common Parasites Lifecycle of the Tapeworm Adult lives in small intestine & feeds off of host. Animal ingests intermediate host & receive larvae. Larvae turn into adult.

5. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 5 Pathogenic Classification & Life Cycles of Common Parasites Egg-filled segments leave body through the feces. Adult body is made up of egg-filled worm segments.

6. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 6 Pathogenic Classification & Life Cycles of Common Parasites Beetles, Mosquitoes, Crickets, etc. ingest eggs (intermediate host). Larvae develop in intermediate hosts.

7. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 7 Pathogenic Classification & Life Cycles of Common Parasites Lifecycle of the Mosquito Adult lays egg directly in the water or on dry surfaces. Eggs hatch to larval form once they are moistened. Larvae change to pupa form in water.

8. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 8 Pathogenic Classification & Life Cycles of Common Parasites Metamorphosis occurs changing larvae to adult. Carries many diseases: Encephalitis, malaria, fowl pox, etc.

9. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 9 Pathogenic Classification & Life Cycles of Common Parasites Lifecycle of the Bot Fly Adult fly lay eggs onto horse’s leg. (up to 500) Horse licks leg. Eggs get into mouth.

10. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 10 Pathogenic Classification & Life Cycles of Common Parasites Eggs hatch in mouth. Larvae develop in mouth and is swallowed.

11. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 11 Pathogenic Classification & Life Cycles of Common Parasites Larvae migrate to stomach and attach to stomach walls for 8 to 10 months. Larvae change into pupal stage & leave with feces. Pupa burrow into the ground until adult fly emerges during warm weather. (4 to 8 weeks)

12. Model Agricultural Core Curriculum: Supplement University of California, Davis 275.T 12 Pathogenic Classification & Life Cycles of Common Parasites Parasites Bot Fly Roundworms Tapeworms Mosquito Scolex Proglottids