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The parietal eye is found in the tuatara, most lizards, frogs, salamanders, certain bony fish, sharks, and lampreys. [7] [8] [9] It is absent in mammals but was present in their closest extinct relatives, the therapsids, suggesting that it was lost during the course of the mammalian evolution due to it being useless in endothermic animals. [10]
Like some other living vertebrates, including some lizards, the tuatara has a third eye on the top of its head called the parietal eye (also called a pineal or third eye) formed by the parapineal organ, with an accompanying opening in the skull roof called the pineal or parietal foramen, enclosed by the parietal bones. [63]
This rare lizard-like creature is only found in New Zealand. The. ... It’s called the parietal eye, and we don’t know exactly what it’s used for, but as the video above explains, there are a ...
Like some lizards, the tuatara possesses a parietal eye (also called a pineal eye or a third eye) covered by scales at the top of the head formed by the parapineal organ, with an accompanying hole in the skull roof enclosed by the parietal bones, dubbed the "pineal foramen", which is also present in fossil rhynchocephalians.
New Zealand's tuatara isn't a lizard, even if it looks like one. This reptile, which has barely changed in over 200 million years, belongs to a prehistoric order that once dominated the planet.
Parietal eye Several species of lizards, including the iguanas, have a pale scale towards the back of their heads marking the parietal eye . This organ is sensitive to changes in illumination and sends signals to the pineal gland noting the change between day and night.
The parietal eye is a light-sensitive structure present in the tuatara, most lizards, frogs, salamanders, certain bony fish, sharks and lampreys, a group of jawless fish. [4] It plays an important role in geographical orientation and regulating circadian and annual rhythms.
This unique feature is responsible for thermoregulation and hormone regulation, and possibly helps the lizards make decisions based on the seasons, weather, etc. [8] A March 2020 study of the central bearded dragon found that light-dependent magnetoreception occurs when light with a wavelength under 580 nanometers enters the parietal eye. [9] [10]