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Sillman, A. J., Carver, J. K. & Loew, E. R. (1999) The photoreceptors and visual pigments in the retina of a boid snake, the ball python (Python regius). Journal of Experimental Biology, 202 1931–1938. 
Added by: Sarina (06 May 2014 13:51:31 UTC)   
Resource type: Journal Article
BibTeX citation key: Sillman1999
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Categories: Englisch = English
Keywords: Farbsehen = Color Vision, Netzhaut = Retina, Schlangen = Snakes
Creators: Carver, Loew, Sillman
Collection: Journal of Experimental Biology
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Abstract
The photoreceptors and visual pigments of Python regius were studied using microspectrophotometry and scanning electron microscopy. The retina contains rods and cones, with rods constituting at least 90 % of the photoreceptor population. The rods are of a single type with long, narrow outer segments and are tightly packed. The wavelength of maximum absorbance (λ max) of the visual pigment in the rods is in the region of 494 nm. Two distinct types of cone are present. The most common cone, with a stout but stubby outer segment, contains a visual pigment with λ max at approximately 551 nm. A relatively rare cone, with a long, slender outer segment, contains an ultraviolet-sensitive visual pigment with λ max at approximately 360 nm. All the visual pigments have chromophores based on vitamin A1. The results are discussed in relation to the behavior of P. regius.
Added by: Sarina  
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