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different daphnia

 
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Litonotus



Joined: 20 Jun 2011
Posts: 1393
Location: Poland

PostPosted: Mon May 27, 2013 11:27 am    Post subject: different daphnia Reply with quote

The head and mouth are strange to me, could you ID it?

in that sample I have found only daphnia magna, this one looks almos the same, only its head is different.



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Clado



Joined: 13 Feb 2012
Posts: 96
Location: The Netherlands

PostPosted: Mon May 27, 2013 11:59 am    Post subject: Reply with quote

Hello Litonotus,

This is a male of Daphnia magna.
Nice pictures. Thank you.

Kind regards

Clado
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Clado



Joined: 13 Feb 2012
Posts: 96
Location: The Netherlands

PostPosted: Mon May 27, 2013 1:18 pm    Post subject: Reply with quote

Hello Litonotus,

When there are females and males in a sample there are often females with an ephippium as well. An ephippium is a kind of pouch for resting eggs (fertilized eggs). The ephippium of Daphnia magna contents two resting eggs with oblong form. The ephppium with the resting eggs, containing dormant embryos, makes it possible to survive for a period of years.
May be you find a female with an ephippium (two, oblong, dark eggs).

Clado
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Litonotus



Joined: 20 Jun 2011
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Location: Poland

PostPosted: Mon May 27, 2013 9:11 pm    Post subject: Reply with quote

thank you very much (:
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