Periods of microRNA Innovation

Question

[virpatel3]

I have a set of microRNA ages with corresponding labels suggesting which clade they first emerged from. For instance, for hsa-mir-1, let's say, it would have an age of Eutheria. I have several peaks in the distributions of my age. One idea I had was to check to see if these peaks correspond to periods of intense specialization. For instance, the Eutheria clade saw a vast diversification of species relative to other clades. I'd like to determine this from a more computational perspective rather than Googling each clade.