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. Author manuscript; available in PMC: 2018 Jul 10.
Published in final edited form as: Nat Ecol Evol. 2017 Sep 11;1(10):1535–1542. doi: 10.1038/s41559-017-0285-5

Figure 1. An ectodermal origin of the gut-like tissue of N. vectensis supports an alternative homology between cnidarian and bilaterian germ layers.

Figure 1

(a) Schematics of the traditional and alternative homology of germ layers between cnidarians and bilaterians. Bilateria are represented by a schematized larval stage with through-gut. (b) Schematic fate map of the germ layers in N. vectensis as described in this paper. (c) Developmental origin and distribution of tissue functions mapped on a schematic cross-section of a juvenile mesentery of N. vectensis. Functions described in this paper are in italic and bold. bw: body wall; circ. m.: circular muscle; com mes: complete mesentery; ecto: ectoderm; endo: endoderm; incom mes: incomplete mesentery; par. m.: parietal muscle; ph: pharynx; retr. m.: retractor muscle; sep fil: septal filament.