One of the things about evolution, is that it keeps branching. Some of the missing links, are the common ancestors of various branches. Branches often splitting because of different threads finding different answers to the same problem. We wont find all of the threads, probably the best we can do is continue to review, and clarify the principal of adaptation. Perhaps the history of the earth's climate can be drawn from the adaptations that have resulted from change. There were millions no doubt billions of species for which there is no fossil record. Every species that exists has the potential to propagate a new split. Evolution continues today and will continue while the earth supports life.