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The conditions for moult of the upper jaw ofOphryotrocha puerilis were determined in isolated individuals and in groups of various sizes. The frequency of formation of the complicated upper jaw in both isolated individuals and in groups varies to a considerable extent. Although formation of the upper jaw and sex reversal normally are associated processes, the relationship of these two processes is not very well understood. Histological investigations at the light microscopic level demonstrate that the dental apparatus is an elaboration of the ectodermal stomodaeum which is considered to be a highly specialized part of the cuticle in the pharyngeal region of the gut.

Evaluation of the pair-culture effect inOphyryotrocha puerilis (Polychaeta: Dorvilleidae). II. Conditions for the moult of the upper jaw