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Figure 6 | Frontiers in Zoology

Figure 6

From: Fine taxonomic sampling of nervous systems within Naididae (Annelida: Clitellata) reveals evolutionary lability and revised homologies of annelid neural components

Figure 6

Central and peripheral nervous system of anterior segments of naidids. A-C) Ventral maximum intensity projections of the anterior end of Tubifex tubifex (A), Pristina aequiseta (B) and Allonais paraguayensis (C), showing the ventral nerve cord neuropil and segmental peripheral nerves. Labeled acetyl-tubulin immunoreactive nerves (green) and serotonin immunoreactive nerves and perikarya (red) consistently show a different pattern in anterior-most segments as compared to more posterior segments, but the level at which this transition occurs varies across species, as well as across the elements of the nervous system. The transition between the anterior and posterior pattern of segmental nerves is indicated by the back-to-back arrowheads (number of segmental nerves per segment indicated beside arrowheads). Nerve identity is shown below for segments flanking the boundary. D-G) Ventral views of DAPI stained specimens of Tubifex tubifex (D), Amphichaeta sp. (E), Pristina leidyi (F), and Allonais paraguayensis (G). The green arrowhead marks the location of the anterior-most connective; anterior segments forming a medullary superganglion are labeled by asterisks. Scale bars: 25 μm.

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