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Lecture 5 Animal Evolution – The Invertebrates

Lecture 5 Animal Evolution – The Invertebrates. a. Turbellarians …Free-Living Flatworm. Most live in seas Few live in freshwater. E.g. Planaria Planaria reproduce asexually by transverse fission??? Transverse fission – body splits in two and each piece re-grows the missing parts.

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Lecture 5 Animal Evolution – The Invertebrates

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. a. Turbellarians…Free-Living Flatworm • Most live in seas • Few live in freshwater. • E.g. Planaria • Planaria reproduce asexually by transverse fission??? • Transverse fission – body splits in two and each piece re-grows the missing parts. • Have pharynx-muscular tube which sucks food and expels wastes. • water is regulated by protonephiridia.

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