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Entwicklung des Hydrozoon Ectopleura dumortieri (Athecatae-Anthomedusae)

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Formal Metadata

Title Entwicklung des Hydrozoon Ectopleura dumortieri (Athecatae-Anthomedusae)
Alternative Title Development of the Hydrozoon Ectopleura dumortieri (Athecatae-Anthomedusae)
Author Kuhl, Willi
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/D-1068
IWF Signature D 1068
Publisher IWF (Göttingen)
Release Date 1971
Language German
Producer Willi Kuhl
Gertrud Kuhl
IWF
Production Year 1966

Technical Metadata

IWF Technical Data Film, 16 mm, LT, 59 m ; SW, 5 1/2 min

Content Metadata

Subject Area Life Sciences
Abstract Morphologie und Schwimmbewegungen der erwachsenen Anthomedusen. Entwicklung von der Eifurchung bis zum planktischen, sternchenförmigen Stadium der Proactinula: totale plan-parallele Furchung, "schneidende" Furchung, direkte Entwicklung ohne das Stadium der planktischen, begeißelten Planula. Differenzierung der jungen Meduse bis zum geschlechtsreifen Tier.
Development of the Hydrozoon Ectopleura dumortieri (Athecatate-Anthomedusae). The metagenetic species Ectopleura dumortieri (Van Beneden, 1844) belongs to the Hydroida Athecata, family Tubulariidae. The sessile polyp is solitary; the medusa is fairly abundant in the summerplankton of the southern North Sea: First, the film demonstrates the morphology of the adult medusa and its swimming movements, and then, time-lapse movies reveal the complete development from the beginning of the egg cleavage to the formation of the planktonic starlet shaped stage of the proactinula. The special mode of development is characterized by: a) the total plane-parallel cleavage to the stage of 32 cells which represents one long row of blastomeres; b) the cutting cleavage furrows which sharply divide the cells successively from one pol to the other as with a knife; a) the direct development from the egg to the proactinula because the normale stage of the free-swimming planktonic flagellated planula is completley suppressed.
Keywords Ectopleura dumortieri
Polypen
Metamorphose / Coelenterata
Larven / Coelenterata
Furchung / Coelenterata
cleavage / Coelenterata
larvea / Coelenterata
metamorphosis / Coelenterata
polyp
Ectopleura dumortieri

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AV-Portal 3.8.0 (dec2fe8b0ce2e718d55d6f23ab68f0b2424a1f3f)