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Lecture 5 Animal Evolution – The Invertebrates

Lecture 5 Animal Evolution – The Invertebrates. The Evolution of Invertebrates. Sponges : no symmetry, tissues or organs Cnidarians : simple tissues and no organs Flatworms : simplest organ systems Annelids : more pronounced organ systems Mollusks

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Lecture 5 Animal Evolution – The Invertebrates

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. The Evolution of Invertebrates • Sponges : no symmetry, tissues or organs • Cnidarians : simple tissues and no organs • Flatworms : simplest organ systems • Annelids : more pronounced organ systems • Mollusks • Roundworms : false coelom, complete digestive system • Arthropods : the most successful • Echinoderms : the junction between invertebrates and vertebrates

  3. Sponges – the simplest of all

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