Animals with endoskeletons do not have any hydrostatic skeletal structures. Similarly, animals with exoskeletons do not have any hydrostatic components. Due to this, it could be said that every animal possesses a unique, singular skeleton that can (only) be classified as an endoskeleton, exoskeleton, or hydrostatic skeleton.

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Many animals exhibit more than one type of skeletal system. For example, echinoderms have both an endoskeleton and a hydrostatic skeleton. This demonstrates that the skeletal classification is not always exclusive, and some animals can have components of different skeletal types.

Animals with Endoskeletons Do Not Have Any Hydrostatic Skeletal Structures