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Spectral sensitivities of 7 morphological types of photoreceptors in the retina of the turtle geoclemys reevesii


, : Spectral sensitivities of 7 morphological types of photoreceptors in the retina of the turtle geoclemys reevesii. Journal of Comparative Neurology 237(2): 145-154

Spectral sensitivities of photoreceptors in the turtle (Geoclemys) retina were studied by intracellular recording, and each cell was filled with Lucifer yellow (LY). Photoreceptors were classified into 7 morphological types: rod, 4 types of single cones, and 2 members of a double cone. Single cones contained 1 of 4 different oil droplets: red, pale-green, orange, and clear. Double cones consisted of 2 apposed cones; principal members contained yellow oil droplets, while accessory members contained no oil droplet. Spectral sensitivities recorded from these 7 types of photoreceptors were classified into 1 type of rod and 3 chromatic types of cones. Rods (n = 19) showed peak sensitivity at 520 nm. Single cones containing either a red (n = 51) or a pale-green (n= 9) oil droplet were red-sensitive (.lambda.max at 620 nm). Single cones containing an orange oil droplet (n = 14) were green-sensitive (.lambda.max at 540 nm). Single cones containing a clear oil droplet (n = 3) were blue-sensitive (.lambda.max 460 nm). Both members of the double cone, principal (n = 22) and accessory (n = 15), were red-sensitive (.lambda.max at 620 nm). No diffusion of LY was detected between the apposed members of double cones. Red-sensitive cones, therefore, consisted of 4 different morphological types of cones, and they occupy .apprx. 70% of the photoreceptor mosaic in the turtle retina.

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