Echinoderms are the most closely related to the major phyla Chordates. It may not seem so at first, but looking closely at embryological evidence, it is believed that chordates and echinoderms shared a common relative. This relative is believed to have been something along the lines of sea urchin - an organism a bit larger than a golf ball with spines extending radially. In addition, Echinoderms and Chordates are both deuterostomes.
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