Figure 4. Comparison of allometric sample size distributions between extant and extinct taxa (A) and between invertebrates and vertebrates (B).

Extinct taxa show a systematically smaller sample size in both invertebrates and vertebrates. Conversely, the sample sizes between invertebrates and vertebrates, for both extinct and extant taxa, are similar. “*” indicates significance of results of Kolmogorov–Smirnov tests for differences in distributions.