1. Protostomes and the Parasitic Lifestyle

2. Main Phyla of Animal Parasites
Phylum
Endoparasite
Ectoparasite
Annelida X
Arthropoda
Nematoda
Nematomorpha
Platyhelminthes
Synderma
Vertebrata

3. Types of Symbiosis
Commensalism
Mutualism
Parasitism

4. Life Cycle Many (e.g. most arthropod parasites) have single hosts.
Some, like most flatworms, have complex life cycles with multiple hosts. The host in which sexual reproduction occurs is called the primary host. Other hosts in which asexual multiplication occurs are called intermediate hosts.

5. Annelid Parasites
Leeches: These mainly are ectoparasites though some are predators. Mainly freshwater and mostly feed on fish and turtles.

6. Arthropod Parasites: Mites/Ticks
Mainly ectoparasites.

7. Arthropod Parasites: Insects
Human Body Louse
Biting Bird Louse

8. Arthropod Parasites: Crustacea
Cymothoa exigua
Sacculina carcini

9. Nematode Parasites: Single Host
Ascaris lumbricoides
Necator americanus

10. Nematode Parasites: Multiple Hosts
Filarial Worm: Wuchereria bancrofti
Guinea Worm: Dracunculus medinensis

11. Nematomorph Parasites: Horsehair Worm

12. Platyhelmenth Parasites: Tapeworms
Taenia solium
Diphylobothrium latum

13. Platyhelminth Parasites: Flukes
Fasciola hepatica
Schistosoma

14. Spiny-Headed Worm Parasites
Macrocanthorhynchus hirudinaceous