Hello Max!
Thank you very much for your answer!
First of all... no, i didn't have analytics or webmaster tools on the development site, i just set up google webmaster tools yesterday to put the removal request. There are ~1800 pages from the dev site indexed and i was removing them one by one when i found this artlicle bu Matt Cutts so i stopped removing:
http://www.mattcutts.com/blog/overdoing-url-removals/
Do you think it would be a good idea to keep doing it?
As far as i have seen, the development site is not outranking the main site but my concern is that the main site home page is showing up in SERP with no snippet so i'm wondering if it´s related somehow with the duplicated content issue.
Regarding your suggestion, DEFINITELLY... that's the type of things that you assume the development company would take care of... I already asked them to add HTTP authentication to the development site!
I really hope Google gets the change soon!
Thank you very much for your help, i really appreciate it!
Un abrazo