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Fascinating Facts About Earthworms and Their Evolution

Explore the incredible world of earthworms in this lecture on animal evolution. Learn how their hydrostatic skeleton, circular muscles, and closed circulatory system work together. Discover how their rudimentary brains and paired nerve cords control their movements and responses.

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Fascinating Facts About Earthworms and Their Evolution

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. Earthworms • have hydrostatic skeleton. • each segment wall is a layer of circular muscles. • worm moves forward by muscle contractions in one segment after another, down the length of its body • contain nephridia; regulate the volume & composition of body fluids. • Have closed circulatory system

  3. Earthworms • Their brains are known as rudimentary brain • Rudimentary brain: • clusters of cells integrates sensory input & commands for muscle responses for the whole body. • Paired nerve cords; long extensions of nerve cell bodies lead out from the brain.

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