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. Author manuscript; available in PMC: 2017 Aug 17.
Published in final edited form as: Wiley Interdiscip Rev Dev Biol. 2011 Dec 27;1(2):253–266. doi: 10.1002/wdev.25

Figure 1. Germ size difference between Drosophila and Tribolium.

Figure 1

In long germ-band insects such as Drosophila, the embryonic germ anlagen occupies the majority of the egg (A), whereas in the short germ-band Tribolium, the anlage is only a fraction of the egg (B). In long germ-band insects the entire AP body axis is specified by the end of the blastoderm stage. In short germ-band insects, only the anterior body is specified, and the rest of the posterior body forms through a process of posterior growth in the growth zone, which will eventually form the abdomen.