Data from: The position of Cetacea within Mammalia: phylogenetic analysis of morphological data from extinct and extant taxa

Maureen A. O'Leary & Jonathan H. Geisler
Knowledge of the phylogenetic position of the order Cetacea (whales, dolphins, and porpoises) within Mammalia is of central importance to evolutionary biologists studying the transformations of biological form and function that accompanied the shift from fully terrestrial to fully aquatic life in this clade. Phylogenies based on molecular data and those based on morphological data both place cetaceans among ungulates but are incongruent in other respects. Morphologists argue that cetaceans are most closely related to...
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