Figure 17
From: The normal development of Platynereis dumerilii (Nereididae, Annelida)
Series of conventional light microscopy images of P. dumerilii , 48-56 hpf. The arrangement of the images is similar to figure 10. H: At 50 hpf the adult eye pigment (ae) appears very faintly. L, M, O, P, Q, S: Adult eye pigment becomes well visible from 52 hpf onwards. J: The chaetae (ch) break through the body wall at 52 hpf. F, J, N, R: Chaetae increase rapidly in length. T: Additionally to the first paratroch (with arrows) the second paratroch (black arrows) develop at the posterior boarder of the first segment. Scale bar in all images 20 μm. Further abbreviations see abbreviations list.