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Figure 1 | Frontiers in Zoology

Figure 1

From: Confocal analysis of nervous system architecture in direct-developing juveniles of Neanthes arenaceodentata (Annelida, Nereididae)

Figure 1

SEM of juvenile developmental stages and basic external morphology of N. arenaceodentata. These worms were reared at ≈21°C, and all ages are approximate. Scale bars: A-I = 100 μm; H = 4 mm. Specimens processed for SEM experienced approximately 30% shrinkage. A is a lateral view, anterior to the left and ventral down; B, C, D, and G are ventral views, anterior to the left; E is a ventrolateral view, anterior to the upper left; F, I, and J are dorsal views with anterior up in I, and to the upper left in F and J. A. Hatchling, 10 days post-fertilization (dpf). B. Mid 3-chaetiger stage, 11 dpf. C. Late 3-chaetiger stage, 12 dpf. D. 6 chaetigers, 15 dpf. E. 9 chaetigers, 17 dpf. F. 13 chaetigers, 22 dpf. G. 20 chaetigers, 30 dpf. H. Transverse view (anterior side) of an adult parapodium taken from a mid-body segment. I and J are light micrographs. I. 4 chaetigers, 13 dpf. The developing pharynx underlies the asterisk. J. Adult, 70 dpf. 1st, 2nd, 3rd nascent parapodia, an antenna, ana anal cirrus, ant anterior cirrus, dc dorsal cirrus, dnl dorsal notopodial ligule, mo mouth, NE neuropodium, nec neurochaetae, nel neuropodial ligule, NO notopodium, noc notochaetae, pa palp, pl prechaetal lobe, pr prostomium, py pygidium, vc ventral cirrus, vnl ventral notopodial ligule.

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