Clare AS

Prescott MC

Rees HH

Smith PA

Thorndyke MC

Wainwright G

Previous investigations have shown that insect juvenile hormone (JH) and its analogues induce precocious metamorphosis of barnacle cypris larvae. In the present study, methyl farnesoate (MF; structurally identical to JH III, except for the absence of an epoxide group) has been shown to have a concentration-dependent effect on the development of cyprids of the barnacle Balanus amphitrite. Analysis of cypris extracts by gas chromatography–mass spectrometry with selected ion monitoring (GC–MS–SIM) confirmed the presence of endogenous MF. These data provide evidence that MF functions as a juvenilizing hormone in barnacle cyprids, an effect that hitherto has not been noted

Identificaiton of methyl farnesoate in the cypris larva of the barnacle, <em>Balanus amphitrite</em>, and its role as a juvenile hormone

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