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Figure 7 | EvoDevo

Figure 7

From: Development of the nervous system in Solenogastres (Mollusca) reveals putative ancestral spiralian features

Figure 7

Summary of nervous system development in Wirenia argentea and Gymnomenia pellucida . Schematic drawings based on labeling of acetylated α-tubulin-like immunoreactive (−LIR) (A-E), serotonin-LIR (F-J), and FMRF-amide-LIR (K-O) components of the nervous system during the development of the two solenogaster species investigated; dorsal aspect, apical/anterior is up in all images. In stages where neurotransmitter labeling was inconsistent (H, L, M, N for W. argentea and I, L, M, N for G. pellucida) the maximum amount of labeled structures is depicted; note that serotonin-LIR signal in stage 3 (H) is only present in W. argentea but not in G. pellucida. The ventromedian as well as the prototrochal nerve plexus are not visible in A-E, probably due to their position right beneath the cilia of the developing foot or the prototroch, respectively, and the resulting signal interference; note that even in the early juvenile stage no part of the buccal nervous system was found (we did, however, find a strong serotonin- and a weak acetylated α-tubulin-LIR signal in the buccal nervous system of some adult specimens; see Figure 11). Abbreviations: aoc, flask-shaped cell of apical organ; cc, cerebral commissure; lnb, lateral neurite bundle(s); nlpr, neurite to lateral parts of pre-trochal region; np, neuropil of apical organ; npr, neurite to prototroch; pg, pedal ganglion; pnd, posterior neurogenic domain; pnp, prototrochal nerve plexus; pp, pedal pit; sp, serotonin-LIR perikaryon; src, suprarectal commissure; vnb, ventral neurite bundle; vnp, ventromedian nerve plexus.

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