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Journal of Experimental Biology 58,213-224 (1973)
Published by Company of Biologists 1973

Phototaxis in Limulus Under Natural Conditions: Evidence for Reception of Near-Ultraviolet Light in the Median Dorsal Ocellus

ABNER B. LALL ¹ and ROBERT M. CHAPMAN ²

¹ Department of Biology, The City College, New York, N.Y. 10031
² Eye Research Foundation of Bethesda, Bethesda, Maryland 20014, and Walter Reed Army Institute of Research, Washington, D.C. 20012

1. Phototactic behaviour in Limulus mediated by lateral eye and dorsal ocellus was studied under full-spectrum and restricted-spectrum (near-u.v. and visible light) sunlight on a beach.

2. All eyes (lateral eyes, dorsal ocelli) were occluded excepting one, which mediated the response.

3. It was found that either a lateral eye or a dorsal ocellus alone could mediate positive phototaxis in adult Limulus under full-spectrum sunlight.

4. When the sunlight stimulating the dorsal ocellus was filtered into restricted wavelengths, the near-u.v., but not the visible light, elicited positive phototaxis.