preceded_by Platynereis life cycle stage 4- and 5-segmented errant juvenile stage cephalic metamorphosis stage Developmental stage following 4- and 5-segmented errant juvenile stage with the following key events: Loss of chaetae at the first pair of parapodia, which marks the beginning of the transformation of the first pair of parapodia into the posterior pair of tentacular cirri. The juveniles undergo cephalic metamorphosis by transforming the first pair of parapodia into the posterior pair of tentacular cirri. Larval eyes seem to disappear during metamorphosis. Palpi and antennae elongate slowly. Midgut elongates rapidly with the elongating body. Jaws grow in size and more teeth are added. Larvae build characteristic tubes in which they live. PdumDv:0001520 ceph m platynereis_stage