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Journal of Experimental Biology 49,95-105 (1968)
Published by Company of Biologists 1968

Spectral Sensitivity of Scorpion Eyes and the Possible Role of Shielding Pigment Effect

L. MACHAN ¹

¹ Department of Zoology, University of Botswana, Lesotho and Swaziland, P.O. Roma, Maseru, Lesotho, Southern Africa

1. The lateral eye shows one maximum in the ultraviolet and another in the blue-green region of the spectrum, probably attributable to two receptor types.

2. Light-adapted lateral eyes show the peculiar effect of a marked drop in ultraviolet sensitivity, irrespective of the colour of the adapting light.

3. Absorption by shielding pigment of the lateral eye is slightly selective in the short wavelengths.

4. The median eye has one maximum in the blue-green, violet sensitivity being apparent only with prolonged dark-adaptation.

5. Absorption by the shielding pigment of the median eye appears to be non-selective.