We observed a clear trend of decreasing ω (implying a heavier tail; that is, stronger bias towards large clades) across taxonomic levels for species counts (from a ω value of ~1.4 for species within genera to a ω value of ~0.1 for species within phyla), and more similar ω values ranging from 1.4–1.7 for subclade-within-clade counts (Extended Data Fig. 6a ).
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