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Understanding Segmentation in Animal Evolution: Focus on Invertebrates

This lecture explores the concept of segmentation in animal evolution, particularly among invertebrates. Segmentation refers to the division of the body into interconnected and often repeating units along the main body axis. While many segmented animals exhibit pronounced segmentation, others may have fused segments or specialized appendages. A key example is insects, where segments are fused into three distinct units: the head, thorax, and abdomen, each differing significantly in structure and function.

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Understanding Segmentation in Animal Evolution: Focus on 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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