+A pseudocoel is a fluid-filled [body cavity](/wiki/Body_Cavity) found in some invertebrates, not fully lined by mesoderm. This internal space acts as a simple [hydrostatic skeleton](/wiki/Hydrostatic_Skeleton), providing support and facilitating nutrient distribution.
+## See also
+- [Coelom](/wiki/Coelom)
+- [Acoelomate](/wiki/Acoelomate)
+- [Mesoderm](/wiki/Mesoderm)
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