preceded_by Platynereis life cycle stage mid metatrochophore stage late metatrochophore stage 60-66 lmt At a temperature of 18 C this stages lasts from 60.00 hours till 66.00 hours. Developmental stage following Mid-metatrochophore stage with the following key events: Parapodia visible but cannot move yet. Chaetae of the third chaetigerous segment reach to the posterior end of the larvae. Body shape changes from conical to torpedo-like and slender. Formation of the akrotroch starts. Stomodeal opening becomes slit-like. Ventral medial longitudinal muscle elongates. PdumDv:0001000 platynereis_stage