Paleontological Journal

, Volume 43, Issue 3, pp 237–250 | Cite as

Eotherapsid hypothesis for the origin of Monotremata

  • M. F. IvakhnenkoEmail author


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.

Key words

Monotremata Theromorpha cranial morphology 


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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  1. 1.Borissiak Paleontological InstituteRussian Academy of SciencesMoscowRussia

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