Clade Age and Species Richness Are Decoupled Across the Eukaryotic Tree of Life
Relationships between age and richness within 12 major taxonomic groups for which dense subclade sampling was available as part of the timetree project .
Lines represent fitted PGLS relationships between log(richness) and clade age. Beetles show a significant age-diversity relationship (β = 0.017, p = 0.004). However, all slopes are less than expected under both relaxed-rate and phylogenetic-rate models of among-clade heterogeneity in net diversification rates (Table 1).