Still yet more water fleas

Images made through a microscope. All subject types.

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Olympusman
Posts: 4878
Joined: Sun Jan 15, 2012 12:31 pm

Still yet more water fleas

Post by Olympusman »

Image

Image
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA

Clado
Posts: 98
Joined: Mon Feb 13, 2012 12:07 pm
Location: The Netherlands

Post by Clado »

Nice pictures, special the first one.
First picture probably a male of Scapholeberis rammneri.
Second picture may be Simocephalus vetulus

Olympusman
Posts: 4878
Joined: Sun Jan 15, 2012 12:31 pm

Water fleas

Post by Olympusman »

Clado,
What are your reference resources? What I have are very limited.
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA

vasselle
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Location: France

Post by vasselle »

Hello
Very nice photo :smt041 :smt041
Microscope Leitz Laborlux K
Boitier EOS 1200d

piermicro
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Post by piermicro »

Very nice.

microthings
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Post by microthings »

Very nice waterflea

Clado
Posts: 98
Joined: Mon Feb 13, 2012 12:07 pm
Location: The Netherlands

Post by Clado »

What are your reference resources?

I mostly use: Die Haplopoda und Cladocera Mitteleuropas von Dietrich Flößner. But I have some more literature about water fleas. I am no expert on water fleas but I know that it is a very diffecult group for identification so I am carefull in this matter.
Identification of water fleas is difficult for some reasons:
1 Most keys are based on adult females. Very often a water flea under the microscope is not adult and sometimes it is a male.
2 A female with an ephippium (result of gamogenetic reproduction) looks rather different.
3 Cyclomorfism occurs, caused by ecological circomstances. For instance in the Daphnia group.
4 Local forms occur, the same species in an other place may have a different form.
5 To make it still more difficult there is interspecies hybridisation which leads to still more polymorfism. In the Daphnia group this happens often.


For all this reasons it is not easy to identify water fleas, in particular the genus Daphnia.
Nowadays there is much informationon Internet but a lot of used names are false.

This are reasons why I am careful before I give a definite name to a water flea.

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