In
snakes, the canthals are the scales along the upper surface of the
canthus rostralis. They are located behind the level of the
prenasal/postnasal suture and before the
supraocular
In scaled reptiles, supraocular scales are (enlarged) scales on the crown immediately above the eye.Mallow D, Ludwig D, Nilson G. 2003. True Vipers: Natural History and Toxinology of Old World Vipers. Malabar, Florida: Krieger Publishing Company. ...
.
[Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. .] They are also described as being located along the edge of the crown between the
internasals
In snakes, the internasal scales are those on top of the head between the scales that surround the nostrils. Wright AH, Wright AA (1957). ''Handbook of Snakes of the United States and Canada''. Ithaca and London: Comstock Publishing Associates. (7 ...
and the supraoculars.
[Wright AH, Wright AA. 1957. Handbook of Snakes. Comstock Publishing Associates. (7th printing, 1985). 1105 pp. .] If these are large scales that contact each other along the midline, they are more properly referred to as
prefrontals.
are located between the canthal scales.
References
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Snake scales
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