1. The Eukaryotes 12d: Animals
Helminths & Arthropods

2. reduced or no digestive system reduced nervous system
Helminths
reduced or no digestive system
reduced nervous system
no or reduced locomotion
life cycle is usually complex
For the CDC versions of parasite life cycles

3. 23.13 Phylum Platyhelminthes = flat worms Class Cestoda = tapeworms
2 body parts
hermaphroditic
23.13

4. 23.14 Taenia saginata = beef tapeworm T. solium = pig tapeworm
cysticercus (immature form in muscle)
“dead-end host”
Def. host

5. Echinococcus granulosus

6. Diphyllobothrium latum = broad fish tapeworm
Def. host

7. 23.16 Phylum Platyhelminthes = flat worms Class Trematoda = flukes
snails are usually the intermediate hosts
usually hermaphroditic except schistosomes
23.16

8. 23.17 Schistosoma = blood fluke 2 sexes
Infects >200 million people/year
2 sexes
23.17

9. Swimmer’s itch
Cercaria in skin

10. Fasciola = sheep liver fluke
(Dhost: sheep & other grazing animals; humans are “accidental”)
hermaphroditic
23.17

11. Phylum Nematoda

12. Ascaris
hookworms: Necator & Ancylostoma

13. Enterobius vermicularis = pinworm

14. Trichinella

15. microfilariae
Wucheria

16. Dracunculus medinensis = guinea worm

17. Anisakine worms: Anisakis & others
(~2 cm long)
Def. host

18. Phylum: Annelida (segmented worms) Class: Hirudinae (leeches)
FDA approved
Hirudo medicinalis
leech jar

19. Arthropod vectors
Arachnids
Insects

20. Considered “diseases”
Sarcopti scabiei = scabies, mange
Can be STI

21. Phthirus pubis = crab/pubic louse
Pediculus capitis
Lice:
Pediculus spp.
Phthirus pubis = crab/pubic louse

22. Maggot therapy - for treating non-healing wounds.
Blowflies (Calliphoridae)
usual species: Phaenicia sericata (green blowfly)
(FDA approved)
1. They clean the wounds by dissolving dead
and infected tissue ("debridement");
2. They disinfect the wound (kill bacteria);
3. They speed the rate of healing.
For more info:
status of maggot therapy
(maggot)