A description of a new species of Magelona, M. parochilis sp. nov. is presented, based on material collected from the Yellow Sea, China. The new species belongs to the ‘Magelona mirabilis group’ of magelonids, possessing a rounded prostomium, lacking prostomial horns and specialized chaetae on chaetiger 9. Paired anteriorly open pouches are present between chaetigers 11–12 and 14–15 (occasionally between chaetigers 17–18). Magelona parochilis sp. nov. inhabits intertidal zones and shallow subtidal waters characterized by sandy mud.
