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Figure 27 | Frontiers in Zoology

Figure 27

From: The normal development of Platynereis dumerilii (Nereididae, Annelida)

Figure 27

Series of conventional light microscopy images of P. dumerilii , 3-segmented errant juvenile - small atokous worm with 7 chaetigerous segments. The stage of the juvenile in each row is given in the lower left corner of the first picture of each row. In order to give an overview on the morphological changes throughout development, for each time point a dorsal view, anterior side left (first column: A, D, G, J, M), a close-up of the head (second column: B, E, H, K, N) and several details (third column: C, F, I, L, O) are shown. B: Anterior view of juvenile, dorsal side up. E, H, K and N: Dorsal view of juvenile, anterior side left. Compare A, E, H, K and N: Note the transformation of the most anterior pair of parapodia into the dorsal pair of posterior cirri (pdc). While the number of segments is indicated with CS4, CS5 respectively before cephalic metamorphosis, the numbers are indicated with CS4', CS5' after cephalic metamorphosis. Please note, that CS5 and CS5' are not the same segment. A more detailed description of the cephalic metamorphosis is given in the text. C and I: Stomodeum at a higher magnification, the jaws (j) increase in size and additional teeth (th) form. F and L: All secondary segments are formed by the posterior growth zone (gz). Scale bar in A, D, G, J, M: 100 μm, in all other images 20 μm. Further abbreviations see abbreviations list.

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