Analogue to speciation in ID

Hello all, that's my first post.I've been discussing about ID, creationism and evolution in some forums, and recently I realized something. ID proposers allways ask for evidences of speciation to accept it as a fact, as if speciation was the only thing in evolution. Some of them accept a certain level of modification on heredity, but only within genus or species level. What would be this barrier which keeps modifications from keep occurring, I don't know.But, my question is: what would be an analogue to speciation that evolutionists would require to accept ID? I guess that it would be something like a brand new species just appearing on Earth, suddenly, without any ascendent, filling at least the same requirements that they want for a example of speciation, such as, do not crossbreding with any other specie with fertile offpring and etc, whatever we can think, I did not think much about the requirements for accept a "placement" of a new species by whoever puts it on Earth. Suggestions are welcome ID proposer also would need to explain the method used by the Intelligent Designer, or whoever/whatever he designed to this work, the mechanism, you know.....Well, that is not for the "guided evolution" type of IDCs... it's more specifically for old-earth IDCs who claim that natural selection does not produces new species (you know, "any breed of a dog still a dog", etc).....See ya...(please don't pay much attention to my english )