Q25: Echinoderms are heartless and
Brainless and Headless, yet from
evolutionary point of view they have been
placed on the top of invertebrates
because of
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Echinoderms are the "wonders of the Sea" and are not found on the land or fresh water. Many echinoderms have a radial symmetry and a spiny skin. The coelomic cavity in echinoderms are complex, formed by the fusion of coelomic sacs and are developed from the wall of the archenteron- the rudimentary alimentary cavity is known as the enterocoel. This network of the fluid-filled canals makes up a unique water vascular system. The radial symmetry, spiny calcareous skin and presence of enterocoel gives them the evolutionary significance.
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