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Science 8 July 1966:
Vol. 153. no. 3732, pp. 197 - 198
DOI: 10.1126/science.153.3732.197
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Articles

Compound Ocellus of a Starfish: Its Function

M. Yoshida 1 and H. Ohtsuki 1

1 Tamano Marine Laboratory, Shibukawa, Tamano, Okayama, Japan

The relative effect of light in inducing downward movements of the tips of isolated arms of Asterias amurensis is maximal at 485 millimicrons when the compound ocellus is intact; at 504 millimicrons when the ocellus has been removed. This finding suggests the coexistence of two photoreceptive systems, ocellar and nonocellar.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)