At first glance, starfish seem to be all limbs. So where did the head go? Textbook descriptions of echinoderms — starfish and their relatives, including sand dollars and sea urchins — tend to say this part of their body simply evolved away. But new research in Nature suggests something far weirder: starfish are almost entirely head.
Youmshajekian, Lori. “Heads Up! Starfish are very weird creatures.” Scientific American, vol. 330, no. 1, January 2024, 18.
leg-shaped head.
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