any animal lacking a backbone or notochord; the term is not used as a scientific classification

radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers

system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration

one of the five areas on the undersurface of an echinoderm on which the tube feet are located

tentacular tubular process of most echinoderms (starfish and sea urchins and holothurians) having a sucker at the end and used for e.g. locomotion and respiration

echinoderms characterized by five arms extending from a central disk

an animal resembling a starfish with fragile whiplike arms radiating from a small central disc

any starfish-like animal of the genera Euryale or Astrophyton or Gorgonocephalus having slender complexly branched interlacing arms radiating from a central disc

shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells

primitive echinoderms having five or more feathery arms radiating from a central disk

radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers

system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration

one of the five areas on the undersurface of an echinoderm on which the tube feet are located

tentacular tubular process of most echinoderms (starfish and sea urchins and holothurians) having a sucker at the end and used for e.g. locomotion and respiration