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The Development of the Chromatophore Response to Light in the Larvae of the Crab, Uca pugilator

David F. Johnson
Chesapeake Science
Vol. 15, No. 3 (Sep., 1974), pp. 165-167
Stable URL: http://www.jstor.org/stable/1351037
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Development of the Chromatophore Response to Light in the Larvae of the Crab, Uca pugilator
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Abstract

This study determines when the color rhythm appears in the developmental stages of Uca pugilator. After hatching, samples of larvae were raised through the five zoeal stages and one megalops to metamorphosis. Using the Hogben and Slome method, melanophore readings were recorded at 4 hr intervals from 0800 to 2000, EDT, for 21.5 consecutive days. These readings were recorded from the postero-lateral and postero-ventral margins of the cephalothorax in the zoeae and megalops, respectively. The experiment indicated no diurnal color rhythm upon hatching or throughout the zoeal stages. The primary and secondary chromatophore response developed at megalops.

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