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Reproduction of the terebellid  Eupolymnia nesidensis  was investigated in a population from the Ionian Sea (Mediterranean, South Italy). This species has a worldwide distribution and is very common on Mediterranean hard substrata covered by algae. Observations revealed a spawning period across springtime with lecithotrophic development occurring inside a jelly mass, with eggs measuring 210 μm in diameter. Juveniles leave the jelly mass after 12–13 days building a transitory tube and exhibiting a vagile benthic behaviour, incorporating food directly through the mouth opening. During the juvenile stage, at day ~100, an ontogenetic shift related to feeding behaviour was observed. Specifically, the vagile feeding behaviour was replaced by the adult feeding strategy with the use of the fully developed head tentacles.

Development and ontogenetic changes of feeding behaviour during juvenile early growth of Eupolymnia nesidensis (Annelida, Terebellidae)