Endocrine Control of Tanning in the Crayfish Exoskeleton

See allHide authors and affiliations

Science  19 Jun 1964:
Vol. 144, Issue 3625, pp. 1462
DOI: 10.1126/science.144.3625.1462


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.