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Hydrostatic skeletons

Explore the concept of fluid volume acting as a skeleton in cnidaria, platyhelminthes, nematoda, and rotifera. These invertebrates utilize fluid-containing structures to support their bodies and facilitate movement. Learn about the unique muscle configurations and adaptations of these creatures.

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Hydrostatic skeletons

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  1. Hydrostatic skeletons

  2. The concept • Fluid volume acting as a skeleton • Because it is contained • The material containing the fluid can contract against it and change the configuration of the container

  3. cnidaria • Two layered • Ectoderm • Endoderm • Basal segments of the cells making up both layers have muscle fibers that are at right angles to each other

  4. Platyhelminthes • Two fluid containers • Digestive tract • Acoelomate, mesoderm is a mesenchyme (parenchyma) • Muscles • Circular, longitudinal, and dorso-ventral

  5. Nematoda • Pseudocoelomate-only one layer of mesoderm around outside • Only longitudinal muscles • Cuticle of fibers in all directions • Must moult in order to grow. • Rather inefficient outside of their normal environment

  6. Another form of pseudocoelomate • Rotifera • Muscles for body contraction--inch worm kind of pattern of motion • Cilia wheels on oral surface for both feeding and movement

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