Setogenesis and molting in planktonic crustaceans

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Abstract
The formation of new setae, termed setogenesis, is described for two taxa of planktonic crustaceans: euphausiids, Euphausia pacifica and Thysanoessa spinifera, and a calanoid copepod, Calanus marshallae. Characteristics of setal formation and eversion at ecdysis are described from two time-series of animals preserved at known intervals in their molt cycle. Results from these laboratory reference series indicate that previous interpretations of setogenesis in the literature can by synthesized to describe a dynamic process of setal formation which is common to all crustacean taxa. The morphological characteristics of developing setae are used to designate three specific phases in the molt cycle of planktonic crustaceans (premolt, postmolt, and intermolt). This staging technique may be used to study field-oriented problems related to molting in small planktonic crustaceans.

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