Abstract
The type of neuroendocrine system regulating molting hormone production in the Cirripedia was investigated. Eyestalk extracts ofUca pugilator, when injected into Stage CBalanus improvisus, had no effect on the time to ecdysis, but significantly (p<0.01) increased the time to ecdysis when injected into Stage D0B. improvisus. Extracts prepared from the central nervous system of State CB. improvisus also significantly (p<0.001) increased the time to ecdysis when injected into Stage D0 animals. Injected CNS extracts of Stage D0B. improvisus had no effect on Stage C animals. These results suggest a molting hormone regulatory system for cirripeds that may be functionally similar to, or identical with the one operative in the malacostracans.
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