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Does Flatworms Have Eyes?

David Miller • • 6 min read
Does Flatworms Have Eyes?

Off with their heads. Planarian

Planarian
Eggs develop inside the body and are shed in capsules. Weeks later, the eggs hatch and grow into adults. In asexual reproduction, the planarian detaches its tail end and each half regrows the lost parts by regeneration, allowing endoblasts (adult stem cells) to divide and differentiate, thus resulting in two worms.
› wiki › Planarian
flatworms, which often live in dark, watery environments shielded from direct light, don't have complex eyes like we do. ... But many do have two lensless, primitive “eyespots” on their heads that can detect the intensity of light.

Are flatworms blind?

Bengaluru-based researchers have found that flatworms, which are highly averse to light and move away from it, have the ability to discern different colours despite being colour-blind. Unlike humans who have three colour-sensitive photoreceptors for red, blue and green, flatworms have just one type.

Why do flatworms have eyes?

Flatworms lead a simple existence; instinct determines their actions. Most of their reactions consist of slowly moving away from negative stimulus. For example, when flatworm eyes detect light, a flatworm will turn in the direction of whichever eye is less stimulated.

David Miller
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David Miller

David Miller brings 15 years of experience in global economics, personal finance strategy, and market dynamics. He specializes in turning complex economic trends into actionable insights for everyday readers.