1. Phylum Platyhelminthes

2. Overview Readings Platyhelminthes
Chapter 13 Introduction (skim to appreciate diversity and morphology)
Chapter 14 Aspidobothrea (skim to appreciate diversity)
Chapter 15 Trematoda Introduction
Chapter 18 Plagiorchiformes
Chapter 17 Echinostomatiformes
Chapter 16 Strigeiformes

3. Phylum Platyhelminthes
Class Monogenea
Class Cestoidea
Class Trematoda
Subclass Digenea

4. Class Monogenea: Most ecto-parasites of fish.
Some endo-parasites of urinary bladder and mouth of amphibians and reptiles.
Body covered by tegument.
Posterior hooks with opisthaptor (haptor).
Direct life cycle with single host.

5. Opisthaptor (Haptor)
Ciliated larva

8. Life cycle of Ecto parasitic monogenean

9. Class Trematoda Digenetic and aspidogastrean flukes: all parasitic.
Body covered by tegument.
Most have complicated life cycles with 2-3 hosts (alternation of generations)

10. Aspidogastrean flukes
Alveoli

14. Host Definitions
Definitive Host: Host in which the parasite reproduces sexually.
Intermediate Host: Host in which the parasite develops, but does not become sexually mature.
multiple intermediate hosts.
First Intermediate Host
Second Intermediate Host