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brittle star larva

 
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Wim van Egmond



Joined: 15 Aug 2006
Posts: 826
Location: Berkel en Rodenrijs, the Netherlands

PostPosted: Sat Oct 07, 2006 4:45 am    Post subject: brittle star larva Reply with quote

This is the larva of a brittle star. The body is supported by thin silicious rods. These show bright colours under the polarised ligth of DIC.

Wim

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Ken Ramos



Joined: 27 Jul 2006
Posts: 7076
Location: lat=35.4005&lon=-81.9841

PostPosted: Sat Oct 07, 2006 6:18 am    Post subject: Reply with quote

Gee Wim...looks like a new stealth fighter or something. Never have seen one of these before. I am assuming that a "brittle star" is a marine organism? Wonderful image and quite interesting too. Very Happy
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bernhardinho



Joined: 13 Aug 2006
Posts: 560
Location: Germany

PostPosted: Sat Oct 07, 2006 6:53 am    Post subject: Reply with quote

Yes Ken,

my good friend Mr. google just told me it's some kind of sea star. Gosh, you learn a lot here!!

Wonderful image, by the way!!

Bernhard
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beetleman



Joined: 04 Aug 2006
Posts: 3578
Location: Southern New Hampshire USA

PostPosted: Sat Oct 07, 2006 2:51 pm    Post subject: Reply with quote

An excellent shot Wim. A question...when you take your samples from the ocean, how long do the creatures survive? Does it behave like a freshwater culture, where things live and then the culture evolves over time with different creatures showing up at different times?
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crocoite



Joined: 02 Aug 2006
Posts: 297

PostPosted: Sun Oct 08, 2006 1:25 am    Post subject: Reply with quote

Excellent shot Wim.

You know, when it comes to insects, we are not surprised at the very different morphology between the larval and adult stages, but I personally rarely think of other critters in the same way. From memory, brittle stars can have many arms (not the standard 5 that most starfish have), but you can't pick any on this little one!
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Wim van Egmond



Joined: 15 Aug 2006
Posts: 826
Location: Berkel en Rodenrijs, the Netherlands

PostPosted: Sun Oct 08, 2006 3:32 am    Post subject: Reply with quote

Thanks!

Yes, the larvae of echinoderms are amazingly different from the adults. Britle star and sea urchin larvae have these ods. Sea stars don't have them.

Unfortunately the marine organisms last only a couple of days. I keep the samples in the fridge. They need a lot of oxygen so a flat dish is best. And than work very fast! But perhaps it should be possible to keep them longer if you have a cooled aquarium with an air pump.

Wim
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Wim van Egmond



Joined: 15 Aug 2006
Posts: 826
Location: Berkel en Rodenrijs, the Netherlands

PostPosted: Sun Oct 08, 2006 3:32 am    Post subject: Reply with quote

I'll post some other echinoderm larvae to show the difference.

Below is a juvenile brittle star. It already has the adult shape. The transformation is a strange process.

Wim

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