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  1. Sea urchin - Wikipedia

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  3. Sea urchins use their entire body as an eye - National …

    2011年5月2日 · Learn how sea urchins have evolved a unique visual system with their tube feet and skeleton. Discover how they detect and respond to light direction, and why they have rhabdomeric cells instead of ciliary cells.

  4. Unraveling The Mysteries Of Sea Urchins: Do They Really Have Eyes?

  5. Body of Sea Urchin is One Big Eye - Live Science

    2009年12月28日 · Sea urchins may use the whole surface of their bodies as compound eyes, scientists now suggest. Although sea urchins don't have any problems avoiding predators or finding comfortable dark...

  6. Sea Urchin Anatomy - Ask A Biologist

    2015年8月22日 · There are more than 900 species of sea urchins and they come in a range of colors including purple, blue, brown, green, and red. If you look inside a sea urchin you will see there are some organs that are familiar, like …

  7. Some animals ‘see’ the world through oddball eyes

    2016年5月18日 · A sea urchin (schematic, right) has no centralized brain, just large nerves (blue) that connect to a ring around its mouth.

  8. Sea urchins see with their whole body | ScienceDaily

  9. Eyeless Urchins "See" With Spines - National Geographic

    2010年2月6日 · The spiky body of a sea urchin acts as one big, spine-covered eye, confirms a new study that tested how well urchins can see. Sea urchins, like their close relatives the sea stars...

  10. Sea urchins see with their feet | Lund University

    2018年6月12日 · Sea urchins lack eyes, but can see with their tentacle-like tube feet instead, previous research has indicated. Now, researchers at Lund University in Sweden have tested their vision in a new study, and shown that …

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