The pre-eminent role of directional selection in generating extreme morphological change in glyptodonts (Cingulata; Xenarthra).

Abstract excerpt

The prevalence of stasis on macroevolution has been classically taken as evidence of the strong role of stabilizing selection in constraining morphological change. Rates of evolution calculated over longer timescales tend to fall below the expected under genetic drift, suggesting that directional selection signals are erased at longer timescales. Here, we investigated the rates of morphological evolution of the...

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