An illustration about hydrostatic skeletons: How do some squishy animals maintain their shape? (Left to right: an earthworm, an anemone, an octopus, a jellyfish, and a nudibranch) They have a skeletal system made of one or more water-filled chambers! (Cross section of an earthworm and an octopus tentacle) Water pressure inside keeps the chamber supported, like a water balloon! Hydrostatic skeletons allow boneless animals to... (An octopus in a bottle) Fit into tight spaces! (A wiggling worm) Move quickly due to less weight! (A planarian regrowing itself) Regenerate faster when injured!

Not all skeletons are made of minerals or chitin
#skeletober #inktober #skeleton #hydroskeleton #invertebrates #education #art #SciArt