preceded_by Platynereis life cycle stage late trochophore stage early metatrochophore stage 48-51 emt At a temperature of 18 C this stages lasts from 48.00 hours till 51.00 hours. Developmental stage following Late trochophore stage with the following key events: Formation of the first paratroch at the posterior border of the second chaetigerous segment, chaetae reach the body wall. Number of cells contributing to the stomodeal rosette is slowly increasing. Red pigment at the telotroch can appear. Third commissure forms in the ventral nerve cord. Second and third pair of serotonergic cells in the ventral nerve cord. Oblique and parapodial muscles more numerous and elongate. PdumDv:0000800 platynereis_stage