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Beroë cucumis (Ctenophora) - Embryonalentwicklung


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Formal Metadata

Title Beroë cucumis (Ctenophora) - Embryonalentwicklung
Alternative Title Beroë cucumis (Ctenophora) - Embryonic Development
Author Kuhl, Willi
Kuhl, Gertrud
License No Open Access License:
German copyright law applies. This film may be used for your own use but it may not be distributed via the internet or passed on to external parties.
DOI 10.3203/IWF/E-1909
IWF Signature E 1909
Publisher IWF (Göttingen)
Release Date 1973
Language Silent film
Producer Universität Frankfurt a. M.,
Institut für kinematische Zellforschung
Production Year 1962-1963

Content Metadata

Subject Area Life Sciences
Abstract Rippenqualle. Habitus des tentakellosen adulten Tieres. Disymmetrische oder biradiale Furchung (typische Ctenophorensymmetrie schon nach den ersten drei Teilungsschritten), Bildung der Mikromeren am animalen Pol aus Ektoplasmamaterial. Keimblätterbildung durch Epibolie. Einwanderung sekundärer Mikromeren am vegetativen Pol. Postembryonale Entwicklung bis zum freien Cydippestadium.
In a series of scenes the embryonic development of the ctenophore Beroë is analysed. The particular pattern of cleavage is demonstrated in top and side views as well. At the 8-cell-stage already the embryo's symmetry axes are the same as in the adult. The fourth cleavage results in 8 macromeres and 8 micromeres on the animal pole, the latter increase rapidly in number and grow down over the macromeres (epiboly). A special feature are so-called vegetative, secondary micromeres, which are produced near the blastoporus by the prospective entoderm cells. A free-swimming larva, the cydipped, leaves the egg jelly.
Keywords Rippenqualle
Beroë cucumis
Embryonalentwicklung / Coelenterata
Furchung / Coelenterata
cleavage / Coelenterata
embryonic development / Coelenterata
Beroe cucumis
comb jelly
comb jellyfish

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