Horse (Equus caballus)

Containing taxa: Animalia » Chordata » Osteichthyes » Sarcopterygii » Tetrapoda » Mammalia » Eutheria » Laurasiatheria » Perissodactyla

Photoreceptors:
Receptor Opsin λmax Filter λmax Filter λ50% Recep. λmax
Yellow cone545nm  545nm
Rod500nm  500nm
Blue cone420nm  432nm


Opponent processes:
Description (+) Terminus (-) Terminus Mode
Luminance (photopic)
Yellow cone   Photopic
Luminance (scotopic)
Rod   Scotopic
Green-Indigo
549nm - 486nm - 430nm
 
Yellow cone Blue cone
(Rod)
Photopic
Cones-Rods
586nm - 532nm - 475nm
 
Yellow cone Rod Mesopic

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Notes and References:

Yokoyama, S. & Radlwimmer, F. B. (1998) The "Five-Sites" Rule and the Evolution of Red and Green Color Vision in Mammals. Mol. Biol. Evol. 15(5):560-567. ISSN: 0737-4038

Kirk, E. C., & Kay, R. F. (2004). The evolution of high visual acuity in the Anthropoidea. In Anthropoid Origins (pp. 539-602). Springer US.

Warrant E.J., Nilsson D.-E. (1998) Absorption of White Light in Photoreceptors. Vision Res., Vol. 38, No. 2, pp. 195-207. PII: S0042-6989(97)00151-X

Stavenga D., Smits R.P., Hoenders B.J. (1993) Simple Exponential Functions Describing the Absorbance Bands of Visual Pigment Spectra. Vision Res. 33(8) pp. 1011-1017. doi:10.1016/0042-6989(93)90237-Q



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