Mammalian development does not recapitulate suspected key transformations in the evolutionary detachment of the mammalian middle ear

Proceedings. Biological Sciences
Héctor E Ramírez-ChavesVera Weisbecker

Abstract

The ectotympanic, malleus and incus of the developing mammalian middle ear (ME) are initially attached to the dentary via Meckel's cartilage, betraying their origins from the primary jaw joint of land vertebrates. This recapitulation has prompted mostly unquantified suggestions that several suspected--but similarly unquantified--key evolutionary transformations leading to the mammalian ME are recapitulated in development, through negative allometry and posterior/medial displacement of ME bones relative to the jaw joint. Here we show, using µCT reconstructions, that neither allometric nor topological change is quantifiable in the pre-detachment ME development of six marsupials and two monotremes. Also, differential ME positioning in the two monotreme species is not recapitulated. This challenges the developmental prerequisites of widely cited evolutionary scenarios of definitive mammalian middle ear (DMME) evolution, highlighting the requirement for further fossil evidence to test these hypotheses. Possible association between rear molar eruption, full ME ossification and ME detachment in marsupials suggests functional divergence between dentary and ME as a trigger for developmental, and possibly also evolutionary, ME detachment...Continue Reading

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Citations

Jun 5, 2016·Integrative and Comparative Biology·Anjali GoswamiMarcelo R Sánchez-Villagra
Aug 27, 2016·Frontiers in Zoology·Héctor E Ramírez-ChavesMatthew J Phillips
Nov 24, 2016·Biological Reviews of the Cambridge Philosophical Society·Stephan LautenschlagerEmily J Rayfield
Aug 18, 2018·Journal of Morphology·Cathrin PfaffRico Schellhorn
Feb 23, 2019·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Camilo López-AguirreLaura A B Wilson
Feb 23, 2018·Proceedings. Biological Sciences·Julia A SchultzThomas Martin
Apr 13, 2019·Journal of Anatomy·Aitor Navarro-DíazDiego Rasskin-Gutman
Feb 17, 2017·Zoological Letters·Marcelo R Sánchez-Villagra, Analía M Forasiepi
Dec 15, 2018·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Kathleen K Smith, Anna L Keyte
Feb 10, 2017·Proceedings. Biological Sciences·Daniel J UrbanKaren E Sears
Mar 15, 2019·BMC Evolutionary Biology·Camilo López-AguirreLaura A B Wilson
Jun 15, 2018·Nature·Shundong BiJohn R Wible
Jul 16, 2021·Scientific Reports·Lawrence R FrankVitaly L Galinsky

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