Wong
[藻類] 新手上路
UID 39658
精華
0
積分 14
帖子 10
閱讀權限 10
註冊 2016-4-11
來自 北京
狀態 離線
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[廣告]:
Heart fossilization is possible and informs the evolution of cardiac outflow tract in vertebrates
Lara Maldanis,
Murilo Carvalho,
Mariana Ramos Almeida,
Francisco Idalécio Freitas,
José Artur Ferreira Gomes de Andrade,
Rafael Silva Nunes,
Carlos Eduardo Rochitte,
Ronei Jesus Poppi,
Raul Oliveira Freitas,
Fábio Rodrigues,
Sandra Siljeström,
Frederico Alves Lima,
Douglas Galante,
Ismar S Carvalho,
Carlos Alberto Perez,
Marcelo Rodrigues de Carvalho,
Jefferson Bettini,
Vincent Fernandez ,
José Xavier-Neto
ORCID
ORCID
ORCID
ORCID
University of Campinas, Brazil; Brazilian Biosciences National Laboratory, Brazil; University of São Paulo, Brazil; Geopark Araripe, Brazil; Ministry of Mines and Energy, Brazil; Brazilian Synchrotron Light Laboratory, Brazil; SP Technical Research Institute of Sweden, Sweden; Universidade Federal do Rio de Janeiro, Brazil; Brazilian Nanotechnology National Laboratory, Brazil; European Synchrotron Radiation Facility, France
DOI: http://dx.doi.org/10.7554/eLife.14698
Published April 19, 2016
Cite as eLife 2016;5:e14698
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Abstract
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.
DOI: http://dx.doi.org/10.7554/eLife.14698.001
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古植物是化石的歌! |
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