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Figure 1


Fig. 1. Phylogenetic position and embryonic development of the cnidarian Nematostella. (A) Simplified phylogenetic tree according to published data (Bourlat et al., 2006; Delsuc et al., 2006), showing that Cnidaria is a sister phylum to Bilateria. The presence of apical organs is indicated by asterisks. (B-E) Overview of Nematostella embryonic development: (B) gastrula, (C) planula, (D) metamorphosis and (E) primary polyp. The blastopore/oral pole is marked by asterisks. at, apical tuft; bc, blastocoel; ect, ectoderm; end, endoderm; gc, gastric cavity; mes, mesentery; pha, pharynx; ten, tentacle. Note the short cilia covering the ectoderm in C.