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Lecture 5 Animal Evolution – The Invertebrates

Lecture 5 Animal Evolution – The Invertebrates. 4. Segmentation. Division of a body into interconnecting units that are repeated one after another along the main body axis. Segmented animals may have repeating body series that are not similar to one another.

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Lecture 5 Animal Evolution – The Invertebrates

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. 4. Segmentation • Division of a body into interconnecting units that are repeated one after another along the main body axis. • Segmented animals may have repeating body series that are not similar to one another. • Most annelids; pronounced segmentation. • Others; fused segments or segments with specialized appendages. • E.g. insects segments fused into three units (head, thorax & abdomen); differ very much from one another.

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