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Early development and orientation of the acoustic funnel provides insight into the evolution of sound reception pathways in cetaceans

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dc.contributor.author Yamato, Maya en
dc.contributor.author Pyenson, Nicholas D. en
dc.date.accessioned 2016-10-26T23:23:38Z
dc.date.available 2016-10-26T23:23:38Z
dc.date.issued 2015
dc.identifier.citation Yamato, Maya and Pyenson, Nicholas D. 2015. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F29785">Early development and orientation of the acoustic funnel provides insight into the evolution of sound reception pathways in cetaceans</a>." <em>PloS One</em>. 10 (3):1&ndash;15. <a href="https://doi.org/10.1371/journal.pone.0118582">https://doi.org/10.1371/journal.pone.0118582</a> en
dc.identifier.issn 1932-6203
dc.identifier.uri https://hdl.handle.net/10088/29785
dc.description.abstract Whales receive underwater sounds through a fundamentally different mechanism than their close terrestrial relatives. Instead of hearing through the ear canal, cetaceans hear through specialized fatty tissues leading to an evolutionarily novel feature: an acoustic funnel located anterior to the tympanic aperture. We traced the ontogenetic development of this feature in 56 fetal specimens from 10 different families of toothed (odontocete) and baleen (mysticete) whales, using X-ray computed tomography. We also charted ear ossification patterns through ontogeny to understand the impact of heterochronic developmental processes. We determined that the acoustic funnel arises from a prominent V-shaped structure established early in ontogeny, formed by the malleus and the goniale. In odontocetes, this V-formation develops into a cone-shaped funnel facing anteriorly, directly into intramandibular acoustic fats, which is likely functionally linked to the anterior orientation of sound reception in echolocation. In contrast, the acoustic funnel in balaenopterids rotates laterally, later in fetal development, consistent with a lateral sound reception pathway. Balaenids and several fossil mysticetes retain a somewhat anteriorly oriented acoustic funnel in the mature condition, indicating that a lateral sound reception pathway in balaenopterids may be a recent evolutionary innovation linked to specialized feeding modes, such as lunge-feeding. en
dc.relation.ispartof PloS One en
dc.title Early development and orientation of the acoustic funnel provides insight into the evolution of sound reception pathways in cetaceans en
dc.type Journal Article en
dc.identifier.srbnumber 135448
dc.identifier.doi 10.1371/journal.pone.0118582
rft.jtitle PloS One
rft.volume 10
rft.issue 3
rft.spage 1
rft.epage 15
dc.description.SIUnit NH-Paleobiology en
dc.description.SIUnit NH-Vertebrate Zoology en
dc.description.SIUnit NMNH en
dc.citation.spage 1
dc.citation.epage 15


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