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Biologie du Développement de Villefranche-sur-Mer

Images et Films


Clytia Hemisphaerica - Gallery

 

 

 

 


 Egg: 240 µm diameter

(animal pole at top)   

                gastrula

   (future oral pole at top)

2 days planula (oral pole at top)

polyp forming by metamorphosis

 

         gastrozoid polyp

 gonozoid polyp

newly released baby medusa

 adult medusa 

(1-2 cm in diameter)

female gonad

 

 

(Photos : Tsuyoshi Momose)

Films

 

Colour Film by Christian Sardet and Dany Carré.

(1.1 Mb)

Ovulation in an isolated gonad , trigered by light after a 8 hour dark period.

(0.9 Mb)

The first division of the fertilised egg (1.3 Mb).

Cleavage divisions  1 cell stage to late blastula stage  about 8 h total  (3.9Mb).

Early blastula stage embryos are irregular in shape...

... or sometimes a "twisted heart", with a main cleft corresponding to the original animal pole of the egg (5Mb)

Gastrulation by unipolar ingression (3.5 Mb).

  Metamorphosis
 Formation of primary polyps from a 3 day old planula larvae.

Film 1 :  Covers an 8 hour period with images taken every 5 minutes, starting about 5h after stimulation (3h incubation in 58mM CsCl)(2.2 Mb).

Film 2: Covers a 22 hour period, with images taken every 6 minutes, starting just after stimulation (3h treatment with 58mM CsCl).(3 Mb).

Film 3  Spanning a 4 hour period at the end of polyp formation, images taken every 6 minutes, starting about 20h after stimulation by CsCl. (0.3 Mb).

Stolon Growth  images taken every 10 minutes , about 40h total. (6 Mb) .

Feeding and medusa release images taken every 6 minutes, about 20h total). The gonozoids are swallowing artemia! (3.1 Mb)

Adult Clytia Swimming :  Colour Film by Christian Sardet and Dany Carré. (0.8 Mb)

Release of medusae from gonozooids images taken every 30 seconds for 22 minutes (3.0 Mb).

Another film of medusa budding seen from the side (3.3 Mb) .

 Condensed chromosomes at the onset of mitosis at around the 32 cell stage

Z series  (57 Ko)

 Condensed chromosomes at the onset of mitosis at around the 32 cell stage

3D projection  (119 Ko)

 

 

 

 

Mohamed Khamla - 25/09/17

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