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Biol Bull 68: 4-6. (February 1935)
© 1935 Marine Biological Laboratory
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A NUPTIAL SECONDARY SEX-CHARACTER IN FUNDULUS HETEROCLITUS

GEORGE HOWARD PARKER 1 and HELEN PORTER BROWER 1

1 From the Biological Laboratories, Harvard University

The male of Fundulus heteroclitus possesses a secondary sex-character in the form of a melanophoric mark on its dorsal fin to be seen from April to November but not at other times of the year. It may therefore be described as nuptial. It does not occur in the female. It is composed of an unusually dense aggregation of melanophores whose melanin even when concentrated (light phase) forms a conspicuous dark mark.






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Copyright © 1935 by the Marine Biological Laboratory.