Article Search

FIGURE 1. How to calculate pEPI and EPI from a phylogenetic tree. Numbers above the branches are estimated change scores. Clades A and B are sisters; their performance scores depend on each other. Contrasted change (Cc) is calculated as the mean change score for a clade divided by its sister’s. Contrasted success (Sc) is calculated as the number of species in a clade divided by its sister’s. Time (T) is the amount of time in MY since the clade first appeared. EPI and pEPI are then calculated using equations 1 and 2.


FIGURE 2. (1) pEPI and EPI show a strong correlation. Evolutionary distinctness (ED) when logged shows strong correlations with both EPI (2) and pEPI (3).


FIGURE 3. Dispersion increases as a clade’s time since splitting increases for both success (1) and change (2). Living fossil clades are found towards the bottom-right, clades that have likely experienced an adaptive radiation aggregate in the top-right.


FIGURE 4. Probability of the Wikipedia article for a clade containing the phrase “living fossil(s)” against different scores for EPI (1), pEPI (2) and ED (3).


logo smallPalaeontologia Electronica
23 years of electronic palaeontology

PE is archived by CLOCKSS and LOCKSS programs.