How do I discontinue my identi.ca to twitter feed?

Somehow I was able to set up a feed from my identi.ca account to my twitter account. I'd have sworn there was a link to this on the identi.ca site but I can't find it. And identi.ca isn't listed among the services I authorized on Twitter. I would like to discontinue is as I plan to reverse the process via twitterfeed. Any idea how I first set this up to begin with?