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Phylum Platyhelminthes

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Presentation on theme: "Phylum Platyhelminthes"— Presentation transcript:

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
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 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
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 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
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 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

20

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
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Life Cycle of the Sheep Liver Fluke

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

26

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

28

29

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

31 Life Cycle of a Schistosome Fluke
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Life Cycle of a Schistosome Fluke

32 Schistosome Cercaria have forked tail

33

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

37

38 Scolex

39 Proglottid Testes Uterus Vas deferens Seminal receptacle Ovary
Yolk gland

40 Pork Tapeworm (Taenia solium)
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Pork Tapeworm (Taenia solium)

41 Taenia saginata

42 Life Cycle of the Broad Fish Tapeworm
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 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

45

46 Hydatid Cyst Cysticercus Juvenile stage

47 Ecinococcus granulosus
Adult stage in dog

48


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