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Science 4 June 1971:
Vol. 172. no. 3987, pp. 1052 - 1054
DOI: 10.1126/science.172.3987.1052
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Articles

Photoreceptors in Primitive Chordates: Fine Structure, Hyperpolarizing Receptor Potentials, and Evolution

A. L. F. Gorman 1, J. S. McReynolds 2, and S. N. Barnes 3

1 Laboratory of Neuropharmacology, National Institute of Mental Health, St. Elizabeths Hospital, Washington, D.C. 20032
2 Laboratory of Neutrophysiology, National Institute of Neurological Diseases and Stroke, National Institutes of Health, Bethesda, Maryland 20014
3 Department of Anatomy, University of Colorado Medical Center, Denver 80220

Two species of primitive chordates have hyperpolarizing photoreceptor potentials, as vertebrates do. In Salpa the photoreceptive membrane is composed of microvilli, whereas in Amaroucium it is modified from cilia. There appears to be no functional correlation between fine structure of photoreceptive membrane and polarity of response to light.


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