Abstract
Stages of the zoeal and megalopal molt cycles of Rhithropanopeus harrisii were characterized by the appearance of epidermal cells in the spines and antennae. Eyestalk removal of the beginning of the last zoeal instar slightly accelerated the molt cycle. Fourth-instar larvae which had undergone eyestalk ablation during the third instar progressed through the molt cycle significantly faster than did control larvae. Eyestalkless megalopae also demonstrated an enhanced molting rate. The results suggested that the larval eyestalks contain a factor (molt-inhibiting hormone) which plays a role in controlling the molting rate.
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