Someone has an idea what this will be?

[AlanMM]

Approximately 1.5 cm

http://img651.imageshack.us/img651/811/iemandideewatditwordtotgn.jpg

[super-pede]

some type of fly pupae.I'm not really knowledgeable about flies.

[AlanMM]

ok, I think I found it.

Phlogophora meticulosa

[super-pede]

it might be.

unfortunately, many pupae like this one look so similar that it is hard to figure out the exact species.

[AlanMM]

I have put it in a plastic container with some moist substrate.
I will see what will comes out.
No idea how long this will take though...