Parietal eyelid(s) 'across' or 'up/down'?

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In summary, it seems that lizards, reptiles, tuatara, and fossils with parietal 'third' eyes do not have legacy bone attachments or processes for their third eye's lid muscles. The parietal eye is 'inside out' and 'fixed' compared to their other eyes. It is referred to as "Vertebrae Eye 1.0" and it is speculated that if these creatures had not evolved away from imaging, their third eye's lid(s) would open horizontally rather than up and down. The person has also worked on a project involving these creatures, called WIRS#5, and is currently looking for a proper Latin name for them.
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Nik_2213
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Lizards, reptiles, tuatara and fossils with parietal 'third' eyes do not seem to have legacy bone attachments / processes for their third eye's lid muscles.

In fact, IIRC, the 'parietal eye' seems 'inside out' and 'fixed' compared to said beasties' 'ordinary' eyes.
Perhaps Vertebrae Eye 1.0 ?
YMMV...

If any lizards etc parietal eye had not evolved away from 'imaging', would you expect their third eye's lid(s) to open 'across' rather than 'up/down' ??
 
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In the end, I went with one eye either side of narrow head, one on the brow, all lidded horizontally.

https://www.deviantart.com/the-nik-files/gallery/67694419/WIRS

WIRS#5, 'The Heptonstall Horror', but they don't make an appearance until the end of chapter #10.

I'm currently trawling for a 'proper' Latin name for them...
;-)
 
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1. What are parietal eyelids?

Parietal eyelids, also known as third eyelids or nictitating membranes, are a protective layer of tissue found in some animals, including birds, reptiles, and some mammals.

2. Why do some animals have parietal eyelids?

Parietal eyelids serve multiple functions, including protecting the eye from debris and injury, moistening and cleaning the eye, and aiding in vision by providing an additional layer of protection and lubrication.

3. Do humans have parietal eyelids?

No, humans do not have parietal eyelids. However, we do have a vestigial remnant of this structure called the plica semilunaris, which is a small fold of tissue in the inner corner of the eye.

4. Can parietal eyelids be voluntarily controlled?

In most animals, parietal eyelids are controlled by a muscle that is not under voluntary control. However, some animals, such as certain birds and reptiles, have the ability to voluntarily retract and extend their parietal eyelids.

5. Are there any health concerns associated with parietal eyelids?

In some cases, parietal eyelids may become inflamed or infected, leading to a condition known as "cherry eye." This can be treated with medication or surgery, but if left untreated, it can lead to vision problems or other health complications.

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