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Science 19 June 1964:
Vol. 144. no. 3625, p. 1462
DOI: 10.1126/science.144.3625.1462
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Articles

Endocrine Control of Tanning in the Crayfish Exoskeleton

Milton Fingerman 1 and Yoshihiro Yamamoto 2

1 Department of Zoology, Newcomb College, Tulane University, New Orleans, Louisiana
2 Department of Biology, Chiba University, Chiba, Japan

Tanning of the newly formed exoskeleton of the dwarf crayfish, Cambarellus shufeldti, depends in part upon the presence of a substance from the eyestalk. Injection of eyestalk extract enhances tanning in a specimen with its eyestalks removed, whereas the exoskeleton of an untreated crayfish without eyestalks will not become as dark as that of an intact individual.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)