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Heart fossilization is possible and informs the evolution of cardiac outflow tract in vertebrates
University of Campinas, Brazil; Brazilian Biosciences National Laboratory, Brazil.
Brazilian Biosciences National Laboratory, Brazil; University of São Paulo, Brazil.
University of Campinas, Brazil.
Geopark Araripe, Brazil.
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2016 (English)In: eLIFE, E-ISSN 2050-084X, Vol. 5, no APRIL2016, article id e14698Article in journal (Refereed) Published
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Abstract [en]

Elucidating cardiac evolution has been frustrated by lack of fossils. One celebrated enigma in cardiac evolution involves the transition from a cardiac outflow tract dominated by a Multi-Valved conus arteriosus in basal actinopterygians, to an outflow tract commanded by the Non- Valved, elastic, bulbus arteriosus in higher actinopterygians. We demonstrate that cardiac preservation is possible in the extinct fish Rhacolepis buccalis from the Brazilian Cretaceous. Using X-Ray synchrotron microtomography, we show that Rhacolepis fossils display hearts with a conus arteriosus containing at least five valve rows. This represents a transitional morphology between the primitive, multivalvar, conal condition and the derived, monovalvar, bulbar state of the outflow tract in modern actinopterygians. Our data rescue a Long-Lost cardiac phenotype (119-113 Ma) and suggest that outflow tract simplification in actinopterygians is compatible with a gradual, rather than a drastic saltation event. Overall, our results demonstrate the feasibility of studying cardiac evolution in fossils.

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eLife Sciences Publications Ltd , 2016. Vol. 5, no APRIL2016, article id e14698
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Evolutionary Biology
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URN: urn:nbn:se:ri:diva-127DOI: 10.7554/eLife.14698Scopus ID: 2-s2.0-84964425552OAI: oai:DiVA.org:ri-127DiVA, id: diva2:933927
Available from: 2016-06-07 Created: 2016-05-31 Last updated: 2019-06-14Bibliographically approved

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Siljeström, Sandra

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