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Borealodon osedax, a new stem mysticete (Mammalia, Cetacea) from the Oligocene of Washington State and its implications for fossil whale-fall communities

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dc.contributor.author Shipps, B. K. en
dc.contributor.author Peredo, Carlos Mauricio en
dc.contributor.author Pyenson, Nicholas D. en
dc.date.accessioned 2019-08-30T02:01:29Z
dc.date.available 2019-08-30T02:01:29Z
dc.date.issued 2019
dc.identifier.citation Shipps, B. K., Peredo, Carlos Mauricio, and Pyenson, Nicholas D. 2019. "Borealodon osedax, a new stem mysticete (Mammalia, Cetacea) from the Oligocene of Washington State and its implications for fossil whale-fall communities." <em>Royal Society Open Science</em>. 6 (7):182168&ndash;182168. <a href="https://doi.org/10.1098/rsos.182168">https://doi.org/10.1098/rsos.182168</a> en
dc.identifier.issn 2054-5703
dc.identifier.uri https://hdl.handle.net/10088/98676
dc.description.abstract Baleen whales (mysticetes) lack teeth as adults and instead filter feed using keratinous baleen plates. They do not echolocate with ultrasonic frequencies like toothed whales but are instead known for infrasonic acoustics. Both baleen and infrasonic hearing are separately considered key innovations linked to their gigantism, evolutionary success and ecological diversity. The earliest mysticetes had teeth, and the phylogenetic position of many so-called toothed mysticetes remains debated, including those belonging to the nominal taxonomic groups Llanocetidae, Mammalodontidae and Aetiocetidae. Here, we report a new stem mysticete, Borealodon osedax gen. et sp. nov., from the Oligocene of Washington State, USA. Borealodon preserves multi-cusped teeth with apical wear; microCT scans of the inner ear indicate that the minimum frequency hearing limit of Borealodon was similar to mammalodontids. Borealodon is not recovered within a monophyletic Mammalodontidae nor a monophyletic Aetiocetidae; instead, it represents an unnamed lineage of stem Mysticeti, adding to the diversity of stem mysticetes, especially across the Rupelian-Chattian boundary. Furthermore, the presence of a putative chemosynthetic bivalve along with Osedax, a bone-boring annelid, found in association with the type specimen of Borealodon, offer more insights into the evolution of deep-sea whale-fall communities. en
dc.relation.ispartof Royal Society Open Science en
dc.title Borealodon osedax, a new stem mysticete (Mammalia, Cetacea) from the Oligocene of Washington State and its implications for fossil whale-fall communities en
dc.type Journal Article en
dc.identifier.srbnumber 152137
dc.identifier.doi 10.1098/rsos.182168
rft.jtitle Royal Society Open Science
rft.volume 6
rft.issue 7
rft.spage 182168
rft.epage 182168
dc.description.SIUnit NMNH en
dc.description.SIUnit NH-Paleobiology en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 182168
dc.citation.epage 182168


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