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Average Taxonomic Distinctness distribution. Histograms show frequencies of Average Taxonomic Distinctness (AvTD) values among k = 100 (a), 1,000 (b), 10,000 (c), and 100,000 (d) random subsamples (S = 50) from bivalves' master list by Millard [23]. The distribution shows a skeweness towards the left side.
