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Echinodermata:
"The nervous system of starfish consists, first od a central nerve ring around the mouth, and second, of peripheral nerves radiating from this ring and into each of the arms. If laid on its back, a starfish can soon right itself... by little muscular feet..., and do a somersault. But not all arms function at once." - Jacques Loeb, Experiments on Echinoderms, 1900
The elegant Feather-Star specimen, anative of the Mediterranean, has a permeable membrane by which the interal fludis are extruded into the sea. The slow moving starfish have been used to study motion, spatial orientation, and the regeneration of limbs.
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