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

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SUMMARY

The discussion centers on the anatomical structure and evolutionary implications of the parietal eye in lizards and reptiles, particularly focusing on the absence of traditional bone attachments for the eyelid muscles. Participants note that the parietal eye appears to be 'inside out' and fixed, contrasting with the ordinary eyes of these species. A hypothesis is presented regarding the potential orientation of the parietal eye's lid, questioning whether it would open 'across' rather than 'up/down' if it retained imaging capabilities. The conversation also touches on artistic interpretations of the parietal eye's placement in fictional contexts.

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  • Understanding of reptilian anatomy and the structure of the parietal eye.
  • Familiarity with evolutionary biology concepts related to eye development.
  • Knowledge of artistic representation in biological contexts.
  • Basic grasp of Latin terminology for scientific naming conventions.
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  • Research the evolutionary significance of the parietal eye in reptiles and its functional adaptations.
  • Explore the anatomical differences between parietal and ordinary eyes in various species.
  • Investigate artistic interpretations of reptilian features in literature and visual media.
  • Learn about the process of assigning Latin names in taxonomy and its relevance to biological classification.
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Biologists, evolutionary scientists, artists interested in biological accuracy, and anyone studying reptilian anatomy and adaptations.

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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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Moving to Biology. Have you worked out anything since writing this post?
 
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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