Phylum Platyhelminthes

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Phylum Platyhelminthes

• Biology I Honors

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Examples

• Flatworms
• Planarian
• Marine flatworms
• tapeworms

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Habitat

• Freshwater
• Saltwater
• Terrestrial

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Symmetry

• Bilateral

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Number of Tissue Layers

• 3
• Endoderm
• Ectoderm
• Mesoderm

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Support/Skeleton

• None

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Muscular

• True muscle tissue
• From mesoderm tissue

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Digestion

• Incomplete

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Respiration

• Diffusion

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Excretion

• Flame Cells and pores

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Circulation

• Diffusion

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Nervous

• Two nerve cords and ganglia
• Eye spots
• chemoreceptors

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Temperature Regulation

• Ectothermic

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Reproduction

• Sexual
• Asexual