phylum platyhelminthes flatworms - sciyeung.com · review cont’d movement: cilia on body allows...
Post on 26-Apr-2019
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Phylum Platyhelminthes
flatworms
Theflatworms
Fact Sheet Review
SymmetryandBodyPlan:– Truetissue– bilateralsymmetry– acoelomate (nocavity)
Review cont’dExcretion:wasteismovedoutbyflamecells;leavesthroughpores.
Respiration:gassescandiffusedirectlythroughskin.
Nervous/controlsystem:simple,ladder-likenervoussystem(primitiveanteriorbrain,nervecords,light-sensitiveeyespots).
Review cont’d
Movement:ciliaonbodyallowsforslidingalongmucus.
Reproduction:Bothasexualandsexual.• Asexual:regeneration– ifoneiscutinhalf,youwillhave2!(reallyannoyingtohavetheminyourfishtank)
Representative Organisms
Flatworms1. Tapeworms– internalparasites(mustliveIN
ahostorganism).• Upto20metreslong!
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