, Volume 43, Issue 3, pp 237-250
Date: 07 Jun 2009

Eotherapsid hypothesis for the origin of Monotremata

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Abstract

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.

Original Russian Text © M.F. Ivakhnenko, 2009, published in Paleontologicheskii Zhurnal, 2009, No. 3, pp. 3–16.