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Tooth Loss Precedes the Origin of Baleen in Whales

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dc.contributor.author Peredo, Carlos Mauricio en
dc.contributor.author Pyenson, Nicholas D. en
dc.contributor.author Marshall, Christopher D. en
dc.contributor.author Uhen, Mark D. en
dc.date.accessioned 2019-04-09T02:02:01Z
dc.date.available 2019-04-09T02:02:01Z
dc.date.issued 2018
dc.identifier.citation Peredo, Carlos Mauricio, Pyenson, Nicholas D., Marshall, Christopher D., and Uhen, Mark D. 2018. "<a href="https://linkinghub.elsevier.com/retrieve/pii/S0960982218314143">Tooth Loss Precedes the Origin of Baleen in Whales</a>." <em>Current Biology</em>. 28 (24):3992&ndash;4000.e2. <a href="https://doi.org/10.1016/j.cub.2018.10.047">https://doi.org/10.1016/j.cub.2018.10.047</a> en
dc.identifier.issn 0960-9822
dc.identifier.uri https://hdl.handle.net/10088/96282
dc.description.abstract Whales use baleen, a novel integumentary structure, to filter feed; filter feeding itself evolved at least five times in tetrapod history but demonstrably only once in mammals 1]. Living baleen whales (mysticetes) are born without teeth, but paleontological and embryological evidence demonstrate that they evolved from toothed ancestors that lacked baleen entirely 2]. The mechanisms driving the origin of filter feeding in tetrapods remain obscure. Here we report Maiabalaena nesbittae gen. et sp. nov., a new fossil whale from early Oligocene rocks of Washington State, USA, lacking evidence of both teeth and baleen. The holotype possesses a nearly complete skull with ear bones, both mandibles, and associated postcrania. Phylogenetic analysis shows Maiabalaena as crownward of all toothed mysticetes, demonstrating that tooth loss preceded the evolution of baleen. The functional transition from teeth to baleen in mysticetes has remained enigmatic because baleen decays rapidly and leaves osteological correlates with unclear homology; the oldest direct evidence for fossil baleen is ~25 million years younger 3] than the oldest stem mysticetes (~36 Ma). Previous hypotheses for the origin of baleen 4, 5] are inconsistent with the morphology and phylogenetic position of Maiabalaena. The absence of both teeth and baleen in Maiabalaena is consistent with recent evidence that the evolutionary loss of teeth and origin of baleen are decoupled evolutionary transformations, each with a separate morphological and genetic basis 2, 6]. Understanding these macroevolutionary patterns in baleen whales is akin to other macroevolutionary transformations in tetrapods such as scales to feathers in birds. en
dc.relation.ispartof Current Biology en
dc.title Tooth Loss Precedes the Origin of Baleen in Whales en
dc.type Journal Article en
dc.identifier.srbnumber 150749
dc.identifier.doi 10.1016/j.cub.2018.10.047
rft.jtitle Current Biology
rft.volume 28
rft.issue 24
rft.spage 3992
rft.epage 4000.e2
dc.description.SIUnit NMNH en
dc.description.SIUnit NH-Paleobiology en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 3992
dc.citation.epage 4000.e2
dc.relation.url https://linkinghub.elsevier.com/retrieve/pii/S0960982218314143

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