THE SENSORY BASIS OF HOST RECOGNITION BY SYMBIOTIC SHRIMPS, GENUSBETAEUS

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Abstract
1. The sensory basis of host-oriented locomotion in the caridean Betaeus macginitieae contrasts with that of the congeneric B. harfordi. Both of these shrimps can locate their respective host organisms utilizing chemical stimuli of host origin. Only B. macginitieae demonstrates the ability to utilize visual stimuli for this same purpose. 2. By using information contained in multiple stimulus modalities, B. macginitieae is able to maintain a more restricted host association than its congener. 3. Visual recognition of its urchin host by B. macginitieae does not involve any parameter of the total visual pattern of the urchin that uniquely characterizes the urchin species, but appears to be a generalized response to larger, dark forms of undefined peripheral outline. 4. Positive rheotaxis in the presence of appropriate non-directional chemical stimuli is suggested as the mechanism by which B. harfordi effects chemically-mediated host location.

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