New species are discovered on a pretty regular basis.
https://www.google.com/#q=new+species+found+2013
Over the past year, as I've seen these articles, one thing stands out to me. Almost every new species discovered is very similar to an existing species. What makes them "new" is that the two different species cannot produce viable/fertile offspring if they inter-breed.
I may be wrong, but I see three possible explanations for these newly discovered species.
1) They have always existed and man has just now learned of them.
2) God suddenly decided to introduce a new species to the planet.
3) The new species evolved from an existing species.
[MENTION=12394]PoliticalChic[/MENTION] In my mind, option 3 is much more plausible than options 1 and 2 for most cases.
Evolution is usually slow, the Cambrian period spans a time frame of millions of years, not something one can observe in a lifetime. While new species may be discovered in my lifetime, that doesn't mean the evolution of them occurred within my lifetime.