Lecture 5 Animal Evolution – The Invertebrates - PowerPoint PPT Presentation

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Lecture 5 Animal Evolution – The Invertebrates PowerPoint Presentation
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Lecture 5 Animal Evolution – The Invertebrates

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. Their Life Cycle • Medusae & polyps-grow & develop during their lifecycles. • Medusae; sexual stage • Embedded in the medusa’s epithelium are gonads; primary reproductive organs. • Gonads release gametes; sperm & ovum-zygote. • Zygote develop into planulas which forms polyp/medusa