Distributions of extinction times from fossil ages and tree topologies: the example of mid-Permian synapsid extinctions.

However, the difference between extinction time of Sphenadocondidae and that of the other two clades is marginally significant; the probability that Sphenacodontidae became extinct after Ophiacodontidae is 0.953, and for Edaphosaurida, this is 0.958.

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