Rod and cone pigments of the Atlantic guitarfish, Rhinobatos lentiginosus Garman

Samuel H. Gruber, Ellis R. Loew, William N. McFarland

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Using both extraction- and micro-spectrophotometric (MSP) methods the visual pigment(s) from the rods and cones of the Atlantic guitarfish, Rhinobatos lentiginosus, were shown to be spectrally similar, if not identical (lambda max = 498-499 nm). Color vision, therefore, is unlikely unless mediated via colored oil droplets in the inner segments. The identical lambda max for the rod and cone pigments suggest that vision in both dim and bright light may correlate with the underwater spectrum over the depths and the times of day that guitarfish are active. The primary advantage of the blue-green sensitive visual pigments, we suggest, is to enhance the contrast of targets silhouetted against the background spacelight.

Original languageEnglish (US)
Pages (from-to)85-87
Number of pages3
JournalJournal of Experimental Zoology
Issue number5 S
StatePublished - 1990

ASJC Scopus subject areas

  • Animal Science and Zoology


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