Anyone know what this is.

[frfmfrfm]

Very good friends, you know this is one, could be a rotifer or copepod nauplii.
A greeting and thanks.

[ruhop]

Hallo, Francisco.

It's a rotifer. Look at the spurs (right upper corner of the picture) and the mastax (left corner of the picture). A Nauplius has legs.

Greetings from behind the Taunus-Mountains

Holger

[Michael Plewka]

hi Francisco,
Holger is right, it is a rotifer, probably a Cephalodella.
You may have a further check on this page:


http://www.plingfactory.de/Science/GruKlaOeko/Teichleben/Rotatoria/TL5RotMonPloi4.html

best regards Michael Plewka

[frfmfrfm]

Thank you very much to you both for your quick responses, it was clear the mástrax but the rear questioned me with copepod.
This sample was collected in the Guadalquivir River Cordoba, cradle of many civilizations.
The water sample is taken in the vicinity of the Roman bridge that dates from the first century AD



A greeting and thanks.

[rekuwi]

Lieber Francisco,

nice bridge, nice place where you take the sample.
Shurely better weather then here in the middle of Germany.

Herzliche Grüße
Regi

[frfmfrfm]

Rekuwi thank you very much, this is the last year in April, quite dry years, now Sevilla time ago just as good but elGuadalquivir carries more water, it has rained here this week.

A greeting and thanks.

[frfmfrfm]

I upload a video that I have made ​​in this nauplii.
You can see their movements contraction.
Greetings to all.

http://youtu.be/WaQvULeh5N4