More on placental mammals

by Greg Mayer There have been a number of interesting comments by readers on my post on the recent paper on the radiation of placental mammals by Maureen O’Leary and colleagues. I want to respond briefly to a few of them here. Biogeography. Does this paper imply that the origin and geographic distribution of the  […]

The orders of modern placental mammals originated after the extinction of the dinosaurs

by Greg Mayer (Updates below.) A new study just published in Science by Maureen O’Leary and colleagues examines the phylogeny of 40 fossil and 46 extant mammals based on a very large data set of morphological and molecular characters (the latter only from the living taxa). The study has gotten a fair amount of attention […]

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