Phylum Platyhelminthes

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Phylum Platyhelminthes - The Flatworms
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General Characteristicsof PlatyhelminthesThese
organisms are dorso-ventrally flattened and
bi-laterally symmetrical. Instead of having an
inert skin or cuticle they have a living surface
membrane, the tegument. Unlike the protozoa they
have distinct functioning systems such as muscle
and nervous systems. They have complex
reproductive systems having both male and female
reproductive organs, usually within the same
organism (hermaphroditic). They also have an
excretory system and, with the exception of the
tapeworms, have a primitive digestion
system.Systems Characteristicshttp//www.mcwdn.
org/Animals/Flatworm.html
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Planaria Anatomy
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Note eyespots
Planaria- note branching gastrovascular cavity
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Planaria Organ Systems
Ladder-like nervous system
Digestive system
Pharynx
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Regeneration of Planaria
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The Tapeworms
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Tapeworm Microanatomy
Scolex
Eggs in Proglottid
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Tapeworm Life Cycle
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Sheep Liver Fluke
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