Eotherapsid hypothesis for the origin of Monotremata
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- Ivakhnenko, M.F. Paleontol. J. (2009) 43: 237. doi:10.1134/S0031030109030010
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Comparative study of the cranial structures (lateral wall of the braincase, temporal and tympanic regions) of mammals and theromorphs shows that Monotremata evolved from the eotherapsid stem of theromorphs, while therian mammals are descendants of eutherapsids.