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Does Urchin Have Eyes?

Robert Thorne • • 6 min read
Does Urchin Have Eyes?

Summary: Sea urchins lack eyes, but can see with their tentacle-like tube feet

tube feet
The tube feet in a starfish are arranged in grooves along the arms. They operate through hydraulic pressure. They are used to pass food to the oral mouth at the center, and can attach to surfaces. ... Tube feet allow these different types of animals to stick to the ocean floor and move slowly.
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instead, previous research has indicated. ... They see using light-sensitive cells in their tube feet, which resemble tentacles and, like the spines, are all over the body.

Do sea urchins have brains?

Although sea urchins don't have brains, "it could be their entire nervous system more or less acts as a brain," Johnsen said. ... It's hard to examine their nervous systems, since their nerves are very, very small and the animals are more or less made of rock."

Where are sea urchin eyes?

Sea urchins may use the entire surfaces of their bodies—from the ends of their "feet" to the tips of their spines—as huge eyes.

Robert Thorne
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Robert Thorne

Robert Thorne covers electric vehicle innovations, autonomous driving systems, global mobility trends, and automotive engineering developments.