Development Genes and Evolution

, Volume 210, Issue 7, pp 373–376 | Cite as

The amnioserosa is an apomorphic character of cyclorrhaphan flies

  • Urs Schmidt-Ott
Short Communication


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 have been reduced in the course of dipteran evolution. The insect order of Diptera includes the paraphyletic Nematocera, including gnats and mosquitoes, and the more derived monophyletic Brachycera, the true flies. Nematocera develop within an amniotic cavity and the surrounding serosa, whereas cyclorrhaphan Brachycera do not. This observation implies that the amnion and serosa have been reduced before the radiation of the monophyletic cyclorrhaphan flies. Here I show that an amniotic cavity is formed during embryogenesis of the horsefly Haematopota pluvialis (Tabanidae) and the dancefly Empis livida (Empididae). The results suggest that extraembryonic tissue was reduced in the stem lineage of cyclorrhaphan flies, with consequences for the molecular basis of pattern formation along the anterior-posterior axis of the embryo.

Key words Embryogenesis Amnion Serosa Diptera Orthorrhapha 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Urs Schmidt-Ott
    • 1
  1. 1.Max-Planck-Institut für biophysikalische Chemie, Abteilung für molekulare Entwicklungsbiologie, Am Faßberg 11, 37077 Göttingen, Germany E-mail Tel.: +49-551-2011798, Fax: +49-551-2011755DE

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