High Quality Content by WIKIPEDIA articles! A parietal eye, also
known as a parietal organ or third-eye, is a part of the
epithalamus present in some animal species. The eye may be
photoreceptive and is usually associated with the pineal gland,
regulating circadian rhythmicity and hormone production for
thermoregulation.The lizard-like reptile tuatara has a
"well-developed parietal eye, with small lens and retina." Parietal
eyes are also found in lizards, frogs and lampreys, as well as some
species of fish, such as tuna and pelagic sharks, where it is
visible as a light-sensitive spot on top of their head. A poorly
developed version, often called the parapineal gland, occurs in
salamanders. In birds and mammals the parietal organ (but not the
pineal gland) is absent.
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