pseudocoels

/ˈsuːdoʊˌsiːlz/
noun
  1. Plural of pseudocoel; body cavities that are not completely lined with mesoderm.
    • The development of pseudocoels is an important step in the evolution of animal body plans.
    • In some invertebrates, pseudocoels act as a hydrostatic skeleton for movement.
    • The pseudocoels of roundworms help distribute nutrients throughout their bodies.
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