On trends and patterns in macroevolution: Williston's law and the branchiostegal series of extant and extinct osteichthyans.

Among the departures from the early burst model, there is a highly significant skew to the right, as shown by the D CDF test on the EB fit ( p < 0.0001).

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Conversely, a positive trend parameter represents an overall increase and therefore could be interpreted as evidence against Williston’s law.

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