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Journal of Experimental Biology, Vol 198, Issue 5 1157-1159, Copyright © 1995 by Company of Biologists

JOURNAL ARTICLES

A dorsal light reflex in a squid

T Preuss and BU Budelmann
Marine Biomedical Institute, University of Texas Medical Branch, Galveston 77555-1163, USA.

A dorsal light reflex is described in the squid Lolliguncula brevis. When illuminated from the side in visually homogeneous surroundings, a free-swimming squid rolls the dorsal side of its head and trunk 10-20 degrees towards the light. With the trunk restricted in a holder, the squid rolls its head 4-5 degrees towards the light; this reaction increases by about 50% when the statocysts are bilaterally removed and increases further when the neck receptor organ is also destroyed. The results indicate a multi-modal interaction of visual, statocyst and proprioceptive inputs during postural control.




© The Company of Biologists Ltd 1995