1. Phylum Platyhelminthes
BIO 2215
Oklahoma City Community College
Dennis Anderson

2. Phylum Platyhelminthes
Flat worms
Triploblastic
Acoelomate
Bilateral symmetry
Hermaphroditic
Monoecious
One opening for digestive system
Paired lateral nerve cords & cerebral ganlion
Flame cells

3. Echinodermata Uniramia Chelicerata Chordata Crustacea Protochordates
Lophophorates
Crustacea
Protochordates
Arthropoda
Annelida
Hemichordata
Mollusca
Other
pseudocoelomates
Nemertea
Platyhelminthes
Nematoda
Ctenophora
Cnidaria
Mesozoa
Placozoa
Sarcomastigophora
Ciliophora
Porifera
Apicomplexa
Microspora
Myxozoa

4. Acoelomate
Ectoderm
Mesoderm
Endoderm

5. Fig. 14.1

6. Acoelomate Phylum Platyhelminthes: Class Turbellaria
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Phylum Platyhelminthes: Class Turbellaria
Acoelomate

7. Pseudocoelomate
Ectoderm
Mesoderm
Endoderm

8. Coelomate
Ectoderm
Mesoderm
Endoderm

9. Nervous System Lateral nerve cord Cerebral ganglion Connectives
Eye spot
Auricle

10. Brain
Auricle
Cerebral
ganglion
Paired
nerve cords

11. Copyright © The McGraw-Hill Companies, Inc
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Excretory System

12. Fig. 14.6a

13. Fig. 14.6b

14. Class Turbellaria Eye spots Ciliated surface Regenerate if cut in two
Most are free-living

15. Copyright © The McGraw-Hill Companies, Inc
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Turbellaria

16. Fig. 14.2

17. Class Trematoda Flukes Parasites Holdfast devices Complex life cycle
Most
Complex life cycle
Intermediate host
Animal with juvenile stage
Definitive host
Animal with adult stage

18. Fig. 14.7

19. Clonorchis sinensis Oral sucker Intestine Uterus Yolk gland Ovary
Seminal recepticle
Testes

21. Clonorchis sinensis Chinese liver fluke 50 million people
Cirrhosis of liver
Diarrhea
Edema
Pain

22. Fig

23. Fascioloa hepatica Sheep liver fluke Sheep, cattle and man
Weight loss
Eat vegetation with metacercaria

24. Life Cycle of the Sheep Liver Fluke
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Life Cycle of the Sheep Liver Fluke

25. Fasciolopsis buski Intestinal fluke 10 million people Man and pigs
Hemorrhage and abscesses of small intestine

27. Paragonimus westermani
Lung fluke
Carnivores, pigs, rodents and man
May be fatal

30. Schistosoma
Blood flukes
200 million people
1 million deaths/year

31. Life Cycle of a Schistosome Fluke
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Life Cycle of a Schistosome Fluke

32. Schistosome
Cercaria have forked tail

34. Swimmers Itch

35. Class Monogenea One host Ectoparasites Opisthaptor Mainly fish
Attachment to host

36. Class Cestoidea
Tape worms
No digestive system
40 feet long

38. Scolex

39. Proglottid Testes Uterus Vas deferens Seminal receptacle Ovary
Yolk gland

40. Pork Tapeworm (Taenia solium)
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Pork Tapeworm (Taenia solium)

41. Taenia saginata

42. Life Cycle of the Broad Fish Tapeworm
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Life Cycle of the Broad Fish Tapeworm
Diphyllobothrium latum
Source: Redrawn From Centers for Disease Control, Atlanta, GA.

43. Dipylidium caninum

44. Echinococcus granulosus
Parasite of dogs
Host
Juveniles in sheep, man and other mammals
Intermediate host
Hydatid cyst

46. Hydatid Cyst
Cysticercus
Juvenile stage

47. Ecinococcus granulosus
Adult stage in dog