Originally posted by JesusIsAlive
So, the answer is no.Similarity does not imply common ancestry. Actually every species does have a common ancestor: the first of their respective kind.
If you took every species that the fossil record shows did exist and assume they just went extinct, there would not be enough space on the planet for all of them to live. Over 90% of all life on Earth has gone extinct. The basic facts do not support you simplistic idea.