Additional file 2 of Within-family plasticity of nervous system architecture in Syllidae (Annelida, Errantia)

Additional file 2 Figure S2.Streptosyllis websteri. Innervation of head, pharynx, segments and pygidium. Maximum intensity z-projections of α-tubulin-lir (grey). A: Detail of the brain showing the nuchal organ. The white arrowhead indicates neurite bundles leading from the nuchal organ towards the posterior neurite bundles of the brain. Orange arrowhead indicates a ciliary patch behind the nuchal organ. B: Innervation of the pharynx. C: Ring neurite bundles forming dorsal commissures and segmental ciliary bands. D: Ventral nerve cord and segmental neurite bundles. S. websteri does not have a forth, intersegmental ring neurite bundle E: Parapodial innervation. Neurites bundles reaching from the ventral nerve cord to the parapodium appear either as two or three separate bundles, depending on the scan. E: Pygidial innervation. Scale bars = 50 μm. Abbreviations: br – brain; cno – cilia of support cells of nuchal organ; cc – circumoesophageal connective; cr – ciliary receptors; in – intestine; lan – neurite bundle innervating lateral antenna; lfs – laterofrongal sense organ (homology unclear); man – neurite bundles innervating median antenna; mn – main ventral nerve; mvn – median ventral nerve; pcm – pygidial commissure; pln – neurite bundles innervating parapodial lobe; pon – posterior neurite bundles of the brain; ppa – pharyngeal papilla; r1 – stomatogastric ring neurite bundle 1; r2 – stomatogastric ring neurite bundle 2; rp1 - first root of main parapodial neurite bundle; rp2 - second root of main parapodial neurite bundle; stgn – stomatogastric neurite bundle; Segmental neurite bundles in yellow: I-III – segmental neurite bundles forming ring commissures. II.I-II.III – neurite bundles innervating parapodium.