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I posted an image of this organism before. They are back this year. Here is another image. Can someone ID?

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by the way, not the mosquito larvae. The mosquito larvae provide a size reference.
I have posted more images in the following link, with additional notes...
http://www.flickr.com/photos/entomopixel/6171754483/
here is 1 more image showing ventral prolegs, and lateral view of mouth section. This was taken under a compound microscope.

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Very nice! :D

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A US Dipterist has ID this to Ephydridae.
Another image showing mouth area papillae?

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Brilliant! - I'm always prepared to believe that wierd-looking larvae are ephydrids, but I'm intrigued to know which genus was suggested. Did the US dipterist say which, or can you put me in touch with him/her, please?

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The ID was made by Gregory W Courtney
gwcourt@iastate.edu<gwcourt@iastate.edu>;
No ID to genus was given,
We will eventually figure this one out..

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It is intersting to know
where (what region) was it collected?
Are there some posterior appendages or some ventral structures except these 2 anal papillae?
the water - very salt or fresh?
is it possible to see lateral view?B)

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I looked through the previous images - if it is Nearctic or Hawaiian, or Neotropical
if it is from very salt water
try to check Ephydra gracilis Packard (possibly some young - not mature age):)

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These were found in Raleigh, NC USA. Fresh but stagnant water. Water had been sitting on a container for several weeks.
There are some type of projections in the mouth region. There are prolegs on ventral side. Appear to have 6 to 7 prolegs. I added some images in above comments.

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I looked through Ephydridae literature which I have. The only known species with extracted papillae Ephydra gracilis (=E.cinerea), salt waters. However Ephydra larvae have 3(4) branches of anterior spiracles. We see here at least 6. Some larvae of Parydra and Cirrula have 6 branches, but Parydra has no well developed hooks on ventral creeping welts which I see here. So among known larvae we can think about Cirrula only, but all of them are in salt water and nobody has written about extracted anal papillae in Cirrula. I have read that papillae may be extracted more or less if the salinity of water changes but never observed this myself in Ephydridae.
So, I am sorry, but can not determine this larvae better than it is Ephydridae and subfamily Ephydrinae.:|

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The water where I found these was pretty nasty, very bad smell. As you can see however, mosquito larvae were also able to breed in this water. I also saw Chironomid larvae. Thank you so much for your comments. Next year I will collect some samples.

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Merritt and Cummins, Aquatic Insects of North America, has a key to the common genera of Ephydridae.

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Thanks John! These are hard to come by... I do not have a copy. I'll have to take a trip to the Entomology Dept at NCSU.

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The Brachydeutera adult in the other thread looks very freshly emerged, so I'm inclined to this this may be its larva - but it's not quite like any Brachydeutera larvae I've seen figured. Well worth preserving some adults and larvae (and puparia if you can find them).

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yes! IT is in my list of projects for 2012. They are all gone for this year. Thanks for your input!

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Hi, I found this larvae very similar to these in a water container in Badalona (near Barcelona, Spain, autumn 2019): https://www.dropb...a.mp4?dl=0
Does anybody have the clue to what it was ?

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If you see them again this summer, could you collect some and try to rear them? And keep a couple in ethanol - it should be possible to extract DNA and identify them that way.

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Yes, I will tell them

Thanks