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Platyhelminthes Flatworms Tapeworms Flukes. PHYLUM PLATYHELMINTHES Bilateral Triploblastic Acoelomate –Gastrovascular cavity Cephalization Ladder-like.

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Presentation on theme: "Platyhelminthes Flatworms Tapeworms Flukes. PHYLUM PLATYHELMINTHES Bilateral Triploblastic Acoelomate –Gastrovascular cavity Cephalization Ladder-like."— Presentation transcript:

1 Platyhelminthes Flatworms Tapeworms Flukes

2 PHYLUM PLATYHELMINTHES Bilateral Triploblastic Acoelomate –Gastrovascular cavity Cephalization Ladder-like nervous system Protonephridia with flame cells

3 Fig. 21.15

4 Symmetry

5 Traditional View Continues Acoelomate - Pseudocoelomate vs Coelomate Aceolomate no space between tissue layers, no cavity

6 Protonephridia with Flame cells

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8 Class Turbellaria Free living flatworms Example: Dugesia (Planaria)

9 External Anatomy

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11 Ladder-like nervous system No real “brain”, but anterior ganglia

12 Ladder Nervous System

13 Fig. 21.18

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17 Planaria c.s.

18 Class Trematoda Flukes All parasitic Possess two suckers Have complex life cycles Need multiple hosts

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20 Chlornorchis sinensis

21 Fasciola hepatica w.m.

22 Schistosoma sp. w.m.

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24 Schistosomiasis

25 eosinophylls attacking a larval fluke.

26 Class Cestoda Tapeworms Scolex and proglottids Segmented

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28 Diplydium caninum

29 Scolex Anatomy Rostellum Suckers Neck

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31 Tapeworm development

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34 Proglottid anatomy Uterus Genital pore Ovary Testis

35 Echinococcus granulosus w.m.

36 Hydatid cyst Capsules of scolices

37 Hydatid Cyst Disease

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