Nematodes do not have a skeletal system. Realize that “skeletal system” is broad and can refer to endoskeletons, exoskeletons, and hydrostatic and cartilagenous skeletons–which is pretty much ever animal you can think of.
sylvestergraham is correct that skeletal system can mean many things. However, if you are wondering about animals without bones, there is a larger list.
There is a large number of invertebrates, or animals without backbones, that live in the ocean including starfish, horseshoe crabs, sea urchins and hermit crabs. These animals all have shells or some sort of exoskeleton that keeps all of their insides from jumbling around.
Jellyfish do not have any bones at all. They are made up of a jelly-like substance (go figure) called mesoglea. This material is surrounded by just one thin layer of skin and their bodies are actually composed of about 90% water.
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