Short and Intermediate Germ Band Insects Drosophila forms all of its segments simultaneously from a germ band that extends across the entire egg. Short- and intermediate- germ band insects form their head first. Then, a proliferative zone in the posterior of the embryo keeps forming the cells that provide the posterior segments
Polyembryony: The Parasitic Wasps
In parasitic wasps, the cells divide holoblastically and do not form a syncytium. The cleavage stage embryo then splits to form dozens or even thousands of cell clusters, each cluster forming its own embryo.