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Parietal scales are the scales of a snake located on the snake's head and are connected to the frontals towards the posterior. [1] These plate-like scales are analogous to and take their name from the parietal bone, which forms the roof and sides of the cranium in humans.
Often, snake scales have pits, tubercles and other fine structures which may be visible to the naked eye or under a microscope. Snake scales may be modified to form fringes, as in the case of the eyelash bush viper, Atheris ceratophora, or rattles as in the case of the rattlesnakes of North America. [8]
The parietal eye (very small grey oval between the regular eyes) of a juvenile bullfrog (Lithobates catesbeianus) Adult green anole (Anolis carolinensis) clearly showing the parietal eye (small grey/clear oval) at the top of its head Parietal eye of the Merrem's Madagascar swift (Oplurus cyclurus) is surrounded by a black-and-white spot on the skin, giving it the "three-eyed" appearance
The eye is covered in scales and can only be seen in young juveniles. As mentioned above, the tuatara doesn’t see out of its parietal eye, and scientists aren’t entirely sure of the reason it ...
Its eyes are as long as the distance from its nostril; the rostral is broader than deep with the internasal scales shorter than the prefrontal scales. The frontal scales are longer than their distance from the end of the snout and shorter than the parietal scales. The loreals are as long as they are deep, or, they can be deeper than they are long.
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Parietal callus, feature of the shell anatomy of some groups of snails; Parietal eye, "third eye" of some animal species; Parietal scales, the scales on the head of the snake; Parietal wall, part of the margin of the aperture of a snail shell; The neck frill on the skulls of dinosaurs of the suborder Marginocephalia
Clouded brille of a colubrid nearing moulting Clear brille of the same snake - 20 days earlier Exuvia of grass snake Natrix natrix , showing brille scales The brille (also called the ocular scale , eye cap or spectacle ) is the layer of transparent, immovable disc-shaped skin or scale covering the eyes of some animals for protection, especially ...