caa a22 4500 475767829 CHVBK 20180406123611.0 cr unu---uuuuu 170329e20000601xx s 000 0 eng 10.1007/s004270000068 doi (NATIONALLICENCE)springer-10.1007/s004270000068 Schmidt-Ott Urs Max-Planck-Institut für biophysikalische Chemie, Abteilung für molekulare Entwicklungsbiologie, Am Faßberg 11, 37077 Göttingen, Germany E-mail uschmid@gwdg.de Tel.: +49-551-2011798, Fax: +49-551-2011755, DE aut The amnioserosa is an apomorphic character of cyclorrhaphan flies [Elektronische Daten] [Urs Schmidt-Ott] Abstract : 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. Springer-Verlag Berlin Heidelberg, 2000 Key words Embryogenesis nationallicence Amnion nationallicence Serosa nationallicence Diptera nationallicence Orthorrhapha nationallicence https://doi.org/10.1007/s004270000068 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s004270000068 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Schmidt-Ott Urs Max-Planck-Institut für biophysikalische Chemie, Abteilung für molekulare Entwicklungsbiologie, Am Faßberg 11, 37077 Göttingen, Germany E-mail uschmid@gwdg.de Tel.: +49-551-2011798, Fax: +49-551-2011755, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer