Fig. 11 in How to build a larval body with less than a hundred cells? Insights from the early development of a stalked jellyfish (Staurozoa, Cnidaria)

Fig. 11 Schematic drawing depicting rearrangement and reshaping of endoderm cells during AP axis development seen from two mutually perpendicular planes. Upper row (a–f) represents a cut along the AP axis; lower row (a′–f′) represents a cut perpendicular to the AP axis. Ectoderm is green, endoderm cells are purple. After gastrulation (a, a′), endoderm cells acquire a two-row organization by getting polarized perpendicular to the AP axis (b, b′, c, c′). Later on, the opposite cells intercalate between each other (d, d′) resulting in the elongation and curling of the endodermal core (e, e′), which finally forces the whole body of the larva to elongate (f, f′). At this stage, all endoderm cells are lined up in a single cell row (f, f′)