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Figure 15 | Frontiers in Zoology

Figure 15

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

Figure 15

Ventral nerve cord and muscle development of P. dumerilii , 48-54 hpf, ventral view, anterior up. The age of the larvae in each row is given in the lower left corner of the first picture of each row. The displayed staining is indicated at the bottom of each column. A, G, M, S: The third commissure (3com) of the ventral nerve cord is formed at 48 hpf and more commissural axons are visible in the ventral nerve cord (e.g. compare A, G, M and S). B, H, N, T: In addition to the unpaired serotonergic cell at the posterior end of the larva (white star) and the first pair of serotonergic neurons at the first commissure. A pair of serotonergic cells near the second commissure and a second pair at the first commissure become visible (white arrow heads). E, K, Q, W: The stomodeal rosette (str) is well visible and contains more cells over time. C, D, I, J, O, P, U, V: Parapodial muscles (ppm) and oblique muscles (om) become from 48 hpf onwards. F, L, R, X: The first paratroch (pat1) is visible at the posterior boarder of the second chaetigerous segment from around 48 hpf onwards. CLSM microscopy, maximum projection, Imaris surpass mode. Scale bar in all images 20 μm. Further abbreviations see abbreviations list.

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