Morphologie, Lebensweise und Fortpflanzung von Diplosoma migrans (Ascidiacea)

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Video in TIB AV-Portal: Morphologie, Lebensweise und Fortpflanzung von Diplosoma migrans (Ascidiacea)

Formal Metadata

Title
Morphologie, Lebensweise und Fortpflanzung von Diplosoma migrans (Ascidiacea)
Alternative Title
Morphology, Habits and Reproduction of Diplosoma migrans (Ascidiacea)
Author
Contributors
Jürgen Weiss (Kamera)
License
CC Attribution - NonCommercial - NoDerivatives 3.0 Germany:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
Identifiers
IWF Signature
C 1855
Publisher
Release Date
1995
Language
German
Producer
IWF (Göttingen)
Production Year
1992

Technical Metadata

IWF Technical Data
Film, 16 mm, LT, 191 m ; F, 17 1/2 min

Content Metadata

Subject Area
Abstract
Diplosoma migrans ist ein benthisch lebendes, koloniebildendes Manteltier. Die Kolonie besitzt einen gemeinsamen Mantel mit einer gemeinsamen Ausströmöffnung. Die Tiere sind u. a. im Bereich des Helgoländer Felssockels anzutreffen. Habitat, Kolonieformen, Fortbewegung, Mantelstruktur, zelluläre Elemente, Befestigung am Substrat, Kiemendarm, Herzschlagumkehr, ungeschlechtliche und geschlechtliche Fortpflanzung, Larve, Metamorphose.
Colonies attached to their natural substrate show individual organisms, common discharge opening, and stolons which assist the organisms in fixation and locomotion. Time-lapse sequences show the extension and the retraction of the stolons, assisted by internal ampullae, as well as the locomotion and division of entire colonies. In the following: various cell types located in the mantle, and selected internal organs from individual organisms, such as the central nervous system, the pharynx, the gastrointestinal tract, and the heart as it reverses its beating direction. The vegetative reproduction of the new abdomen and thorax from seperate primordia is further elucidated by showing buds in various phases of development. Demonstrating sexual reproduction, oocytes, semi-developed and fully developed larvae are shown while swimming. Once anchored to a substrat, metamorphosis begins, during the course of which the larval tail soon is retracted. The film closes with the newly founded primary colony extending its feet and crawling around.
Keywords Seescheiden Manteltier Ascidiacea Tunicata Diplosoma migrans Herzschlagumkehr Kolonie / Tunicata Fortbewegung / Tunicata Metamorphose / Tunicata Fortpflanzung, ungeschlechtliche / Tunicata Fortpflanzung, geschlechtliche / Tunicata Morphologie / Tunicata morphology / Tunicata reproduction, sexual / Tunicata reproduction, asexual / Tunicata metamorphosis / Tunicata locomotion / Tunicata colony / Tunicata Diplosoma migrans Tunicata Ascidiacea tunicates ascidians sea squirts

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