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Fig. 1 | BMC Evolutionary Biology

Fig. 1

From: On the role of the proventricle region in reproduction and regeneration in Typosyllis antoni (Annelida: Syllidae)

Fig. 1

Special modes of sexual reproduction in annelids. a Epigamy. The specimen becomes an epitoke and produces gametes. After mating, the individual often dies. b Schizogamy. Only the posterior part of the individual is transformed into a separate epitokous unit called stolon. Gametes could be also produced in non-stolon segments and later transferred into the latter. After maturation, the stolon detaches, mates and dies, whereas the stock regenerates its posterior end

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