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Type: Artigo de Periódico
Title: Heart Fossilization Is Possible And Informs The Evolution Of Cardiac Outflow Tract In Vertebrates
Author: Maldanis
L; Carvalho
M; Almeida
MR; Freitas
FI; de Andrade
JAFG; Nunes
RS; Rochitte
CE; Poppi
RJ; Freitae
RO; Rodrigues
F; Siljestrom
S; Lima
FA; Galante
D; Carvalho
IS; Perez
CA; de Carvalho
MR; Bettini
J; Fernandez
V; Xavier-Neto
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.
Subject: Acipenser-naccarii Heart
Conus Arteriosus
Bulbus Arteriosus
Citation: Elife. ELIFE SCIENCES PUBLICATIONS LTD, n. 5, n. e14698, p. .
Rights: aberto
Identifier DOI: 10.7554/eLife.14698
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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