Schematics of development in <i>Drosophila</i> and <i>Tribolium</i>.

<p>The two left columns show schematics of <i>Drosophila</i> embryos from the uniform blastoderm stage to the extended germband stage. The right three columns show schematics of <i>Tribolium</i> embryos at comparable developmental stages. The schematics in the rightmost column depict dissected, flat-mounted embryos. Red arrows display cell/tissue movement. The question marks highlight two regions (the <i>Drosophila</i> embryo/amnioserosa border in the cephalic furrow region, and the dorsoventral position of the <i>Tribolium</i> embryo/amnion border) where the tissue boundaries are unknown/undescribed. Several features have been omitted, including the yolk, mesoderm gastrulation, anterior gut formation, and appendage formation. The <i>Drosophila</i> fate map is based on data from [<a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.2005093#pbio.2005093.ref018" target="_blank">18</a>] and the references therein. Refer to text for additional details.