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Beroë cucumis (Ctenophora) - Embryonalentwicklung

Formal Metadata

Title
Beroë cucumis (Ctenophora) - Embryonalentwicklung
Alternative Title
Beroë cucumis (Ctenophora) - Embryonic Development
Author
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.
Identifiers
IWF SignatureE 1909
Publisher
Release Date1973
LanguageSilent film
Producer
Production Year1962-1963

Content Metadata

Subject Area
Genre
Abstract
German
German
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.
English
English
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
German
German
English
English
IWF Classification
German
German
English
English