Don't forget that all branches of an extant evolutionary tree end at the same level. Today.

"The number of species represented is approximately the square-root of the number of species thought to exist on Earth (i.e., three thousand out of an estimated nine million species), or about 0.18% of the 1.7 million species that have been formally described and named." - David M. Hillis, Derrick Zwickl and Robin Gutell, University of Texas.

click here to see it in it's breath-taking magnificence