The amnioserosa is an apomorphic character of cyclorrhaphan flies

@article{SchmidtOtt2000TheAI,
  title={The amnioserosa is an apomorphic character of cyclorrhaphan flies},
  author={Urs Schmidt-Ott},
  journal={Development Genes and Evolution},
  year={2000},
  volume={210},
  pages={373-376}
}
In developing insect eggs the cells of the blastoderm adopt either an embryonic or an extraembryonic fate. The extraembryonic tissue consists of epithelia, termed amnion and serosa, which wrap the germ band embryo. The serosa develops directly from part of the blastoderm and surrounds the embryo as well as the yolk. The amnion develops from the margins of the germ band and in most insect species generates a transient ventral cavity for the developing embryo. The amniotic cavity and the serosa… CONTINUE READING