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Type: Journal article
Title: Independent origins of middle ear bones in Monotremes and Therians
Author: Rich, Thomas H.
Hopson, James A.
Musser, Anne M.
Flannery, Tim Fridtjof
Vickers-Rich, Patricia
Citation: Science, 2005; 307(5711):910-914
Publisher: Amer Assoc Advancement Science
Issue Date: 2005
ISSN: 0036-8075
School/Discipline: School of Earth and Environmental Sciences
Statement of
Thomas H. Rich, James A. Hopson, Anne M. Musser, Timothy F. Flannery, Patricia Vickers-Rich
Abstract: A dentary of the oldest known monotreme, the Early Cretaceous Teinolophos trusleri, has an internal mandibular trough, which in outgroups to mammals houses accessory jaw bones, and probable contact facets for angular, coronoid, and splenial bones. Certain of these accessory bones were detached from the mandible to become middle ear bones in mammals. Evidence that the angular (homologous with the mammalian ectotympanic) and the articular and prearticular (homologous with the mammalian malleus) bones retained attachment to the lower jaw in a basal monotreme indicates that the definitive mammalian middle ear evolved independently in living monotremes and therians (marsupials and placentals).
DOI: 10.1126/science.1105717
Appears in Collections:Earth and Environmental Sciences publications

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