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Phylum : Platyhelminthes The Flatworms - PowerPoint PPT Presentation
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Phylum : Platyhelminthes The Flatworms. Acoelomates. Classes of Platyhelminthes. Class Turbellaria (e.g., Planaria ) The Flukes Class Trematoda (e.g., Fascioloaris, Clonorchis ) Class Monogenea Class Cestoda (e.g., Taenia ). General Characteristics. Free-living or parasitic
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Phylum : PlatyhelminthesThe Flatworms
Acoelomates
Classes of Platyhelminthes
- Class Turbellaria (e.g., Planaria)
- The Flukes
- Class Trematoda (e.g., Fascioloaris, Clonorchis)
- Class Monogenea
- Class Cestoda (e.g., Taenia)
General Characteristics
- Free-living or parasitic
- Bilaterally symmetrical, and dorsoventrally flattened
- First animals with 3 germ layers - triploblastic
- Ectodermis
- Mesodermis
- Endodermis
- Epidermis has cilia or cuticle
- Coelom lacking (acoelomate)
General Characteristics cont.
- Digestive system incomplete
- Excretory system – protonephridia
- Nervous system – ladder-like
- Respiratory, circulatory, and skeletal system lacking
- Most monecious
- Some have fragmentation and regeneration (Asexual)
Class TurbellariaFreeliving Flatworms
- Free-living
- Ciliated epidermis
- Mouth ventral
- Digestive system incomplete
Figure 14.02
Freshwater Flatworm
Figure 14.co
Marine Flatworm
Trematoda and Monogenea The Flukes
- Endoparasites
- Cuticle covering body
- Oral sucker surrounds mouth
- Ventral sucker used for attachment
- Complex life cycles
Shistosoma – Blood Fuke
Clonorchis – Chinese liver fluke
Two Intermediate hosts
CestodaThe Tapeworms
- Endoparasites
- Body consists of proglottids and scolex
- Proglottids snapshots of development
- Scolex has structures for attachment (Hooks, suckers and rostellum)
- No digestive system
Hydatid Cysts of dog tapeworm in human brain
A case of a parasite in the wrong host
