Embryonalentwicklung der Gallmücke Wachtliella persicariae (Diptera)

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Video in TIB AV-Portal: Embryonalentwicklung der Gallmücke Wachtliella persicariae (Diptera)

Formal Metadata

Embryonalentwicklung der Gallmücke Wachtliella persicariae (Diptera)
Alternative Title
Embryonic Development of Wachtliella persicariae (Diptera)
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IWF Signature
D 1235
Release Date
Rainer Wolf, Biozentrum (Würzburg)

Technical Metadata

IWF Technical Data
Film, 16 mm, LT, 126 m ; SW, 11 1/2 min

Content Metadata

Subject Area
Eiablage, Zeitrafferaufnahmen der Geschlechtskerne. Befruchtung, Mitosewellen und Verteilung der Furchungskerne im Eiplasmodium mit Hilfe des "Migrationsasters" nach der Telophase. Abschnürung der Polzellen, superfizielle Furchung und Bildung des zellulären Blastoderms. Keimstreifbildung mit Gastrulation und Blastokinese, Rückenschluß, Sprengen der Serosa und Schlüpfen der Larve.
Starting with oviposition, the entire embryonic development, following the early determinating dipteran type, has been recorded by 27 film takes. The transparent eggs permit to observe the migration of the female and the male pronucleus and their fusion. During 4 intravitelline mitotic waves the somatic nuclei, naturally marked by pigmented halos, get distributed over the egg plasmodium. At the posterior pole one (generative) nucleus enters the pole plasm, and the pole cell is tied off. The migration of the cleavage nuclei is caused by plasm flows as well as by the activity of the "migration cytasters", special nuclear organelles derived from the mitotic apparatus. The structural particulars and the function of the cytaster are explained in electron optical and interference contrast pictures respectively. After 8 superficial cleavage divisions the stage of cellular blastoderm has been attained. Formation, elongation, and segmentation of the germ band as well as the blastokinetic movements are of the long germ egg type. Having shortened and the serosa being removed, the embryo closes dorsally, and the larva is ready to hatch 3,5 days after oviposition.
Keywords Mücke / Gallmücke Gallmücke Wachtliella persicariae Embryonalentwicklung / Insecta Furchung / Insecta cleavage / Insecta embryonic development / Insecta Wachtliella persicariae midge / Cecidomydae

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