The shocking origin of human eyes traces back to an ancient “cyclops”

A 600-million-year-old cyclops-like ancestor of all vertebrates reveals the evolutionary origins of human vision and sleep cycles. | Contesto: cronaca

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• The shocking origin of human eyes traces back to an ancient “cyclops”

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A bizarre, cyclops-like creature that swam the ancient seas nearly 600 million years ago may hold the key to understanding how human eyes—and even our sleep cycles—evolved, according to new research. Scientists have traced the origin of all vertebrate vision back to a single light-sensitive organ, called a median eye, perched atop the head of a worm-like ancestor. This discovery challenges long-held assumptions about the complexity of early animal sensory systems and offers a startling new picture of our evolutionary past. The ancestral creature, described as a cyclops-like organism, lived during the Ediacaran period, long before the first fish or amphibians appeared. Researchers believe that as this ancient animal shifted from a sedentary, filter-feeding lifestyle to a more active, mobile existence, it underwent a dramatic evolutionary transformation. The median eye, which likely detected only light and dark, was eventually lost, only to be reinvented in a more sophisticated form: the paired, image-forming eyes that all vertebrates, including humans, rely on today. This evolutionary process, known as convergent evolution, suggests that the development of complex eyes was not a single, linear progression but a series of adaptations driven by changes in behavior and environment. The median eye, sometimes referred to as a parietal or pineal eye in modern animals, still exists in some species, such as lizards and lampreys, where it helps regulate circadian rhythms and detect seasonal changes. In humans, the pineal gland, which produces melatonin to control sleep-wake cycles, is a remnant of this ancient light-sensing structure. The implications of this research extend beyond simple anatomy. Understanding how vision evolved from a single photoreceptor to the intricate optical systems of modern vertebrates could shed light on a range of neurological and developmental conditions. It also underscores the deep evolutionary link between light detection and the regulation of biological clocks, a connection that influences everything from jet lag to seasonal affective disorder in humans. Scientists caution that the fossil record from the Ediacaran period is sparse, making...

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Categoria: cronaca