An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods

Background: The Subclass Coleoidea (Class Cephalopoda) accommodates the diverse present-day internally shelled cephalopod mollusks (Spirula, Sepia and octopuses, squids, Vampyroteuthis) and also extinct internally shelled cephalopods. Recent Spirula represents a unique coleoid retaining shell struct...

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Detalles Bibliográficos
Autores: Doguzhaeva, Larisa A., Bengtson, Stefan, Reguero, Marcelo Alfredo, Mörs, Thomas
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/49681
Acceso en línea:http://hdl.handle.net/11336/49681
Access Level:acceso abierto
Palabra clave:Cephalopoda
Eocene
Seymour Island
Antarctica
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
id AR_0597f91e2fd3efebbcba3ac460bd1b88
oai_identifier_str oai:ri.conicet.gov.ar:11336/49681
network_acronym_str AR
network_name_str Argentina
repository_id_str
dc.title.none.fl_str_mv An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods
title An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods
spellingShingle An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods
Doguzhaeva, Larisa A.
Cephalopoda
Eocene
Seymour Island
Antarctica
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
title_short An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods
title_full An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods
title_fullStr An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods
title_full_unstemmed An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods
title_sort An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods
dc.creator.none.fl_str_mv Doguzhaeva, Larisa A.
Bengtson, Stefan
Reguero, Marcelo Alfredo
Mörs, Thomas
author Doguzhaeva, Larisa A.
author_facet Doguzhaeva, Larisa A.
Bengtson, Stefan
Reguero, Marcelo Alfredo
Mörs, Thomas
author_role author
author2 Bengtson, Stefan
Reguero, Marcelo Alfredo
Mörs, Thomas
author2_role author
author
author
dc.subject.none.fl_str_mv Cephalopoda
Eocene
Seymour Island
Antarctica
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
topic Cephalopoda
Eocene
Seymour Island
Antarctica
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
description Background: The Subclass Coleoidea (Class Cephalopoda) accommodates the diverse present-day internally shelled cephalopod mollusks (Spirula, Sepia and octopuses, squids, Vampyroteuthis) and also extinct internally shelled cephalopods. Recent Spirula represents a unique coleoid retaining shell structures, a narrow marginal siphuncle and globular protoconch that signify the ancestry of the subclass Coleoidea from the Paleozoic subclass Bactritoidea. This hypothesis has been recently supported by newly recorded diverse bactritoid-like coleoids from the Carboniferous of the USA, but prior to this study no fossil cephalopod indicative of an endochochleate branch with an origin independent from subclass Bactritoidea has been reported. Methodology/Principal findings: Two orthoconic conchs were recovered from the Early Eocene of Seymour Island at the tip of the Antarctic Peninsula, Antarctica. They have loosely mineralized organic-rich chitin-compatible microlaminated shell walls and broadly expanded central siphuncles. The morphological, ultrustructural and chemical data were determined and characterized through comparisons with extant and extinct taxa using Scanning Electron Microscopy/Energy Dispersive Spectrometry (SEM/EDS). Conclusions/Significance: Our study presents the first evidence for an evolutionary lineage of internally shelled cephalopods with independent origin from Bactritoidea/Coleoidea, indicating convergent evolution with the subclass Coleoidea. A new subclass Paracoleoidea Doguzhaeva n. subcl. is established for accommodation of orthoconic cephalopods with the internal shell associated with a broadly expanded central siphuncle. Antarcticerida Doguzhaeva n. ord., Antarcticeratidae Doguzhaeva n. fam., Antarcticeras nordenskjoeldi Doguzhaeva n. gen., n. sp. are described within the subclass Paracoleoidea. The analysis of organic-rich shell preservation of A. nordenskjoeldi by use of SEM/EDS techniques revealed fossilization of hyposeptal cameral soft tissues. This suggests that a depositional environment favoring soft-tissue preservation was the factor enabling conservation of the weakly mineralized shell of A. nordenskjoeldi.
publishDate 2017
dc.date.none.fl_str_mv 2017-03
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/49681
Doguzhaeva, Larisa A.; Bengtson, Stefan; Reguero, Marcelo Alfredo; Mörs, Thomas; An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods; Public Library of Science; Plos One; 12; 3; 3-2017; 1-20; e0172169
1932-6203
CONICET Digital
CONICET
url http://hdl.handle.net/11336/49681
identifier_str_mv Doguzhaeva, Larisa A.; Bengtson, Stefan; Reguero, Marcelo Alfredo; Mörs, Thomas; An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods; Public Library of Science; Plos One; 12; 3; 3-2017; 1-20; e0172169
1932-6203
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0172169
info:eu-repo/semantics/altIdentifier/url/http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0172169
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Public Library of Science
publisher.none.fl_str_mv Public Library of Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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spelling An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopodsDoguzhaeva, Larisa A.Bengtson, StefanReguero, Marcelo AlfredoMörs, ThomasCephalopodaEoceneSeymour IslandAntarcticahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Background: The Subclass Coleoidea (Class Cephalopoda) accommodates the diverse present-day internally shelled cephalopod mollusks (Spirula, Sepia and octopuses, squids, Vampyroteuthis) and also extinct internally shelled cephalopods. Recent Spirula represents a unique coleoid retaining shell structures, a narrow marginal siphuncle and globular protoconch that signify the ancestry of the subclass Coleoidea from the Paleozoic subclass Bactritoidea. This hypothesis has been recently supported by newly recorded diverse bactritoid-like coleoids from the Carboniferous of the USA, but prior to this study no fossil cephalopod indicative of an endochochleate branch with an origin independent from subclass Bactritoidea has been reported. Methodology/Principal findings: Two orthoconic conchs were recovered from the Early Eocene of Seymour Island at the tip of the Antarctic Peninsula, Antarctica. They have loosely mineralized organic-rich chitin-compatible microlaminated shell walls and broadly expanded central siphuncles. The morphological, ultrustructural and chemical data were determined and characterized through comparisons with extant and extinct taxa using Scanning Electron Microscopy/Energy Dispersive Spectrometry (SEM/EDS). Conclusions/Significance: Our study presents the first evidence for an evolutionary lineage of internally shelled cephalopods with independent origin from Bactritoidea/Coleoidea, indicating convergent evolution with the subclass Coleoidea. A new subclass Paracoleoidea Doguzhaeva n. subcl. is established for accommodation of orthoconic cephalopods with the internal shell associated with a broadly expanded central siphuncle. Antarcticerida Doguzhaeva n. ord., Antarcticeratidae Doguzhaeva n. fam., Antarcticeras nordenskjoeldi Doguzhaeva n. gen., n. sp. are described within the subclass Paracoleoidea. The analysis of organic-rich shell preservation of A. nordenskjoeldi by use of SEM/EDS techniques revealed fossilization of hyposeptal cameral soft tissues. This suggests that a depositional environment favoring soft-tissue preservation was the factor enabling conservation of the weakly mineralized shell of A. nordenskjoeldi.Fil: Doguzhaeva, Larisa A.. Swedish Museum of Natural History; SueciaFil: Bengtson, Stefan. Swedish Museum of Natural History; SueciaFil: Reguero, Marcelo Alfredo. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Departamento Científico de Paleontología de Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Mörs, Thomas. Swedish Museum of Natural History; SueciaPublic Library of Science2017-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/49681Doguzhaeva, Larisa A.; Bengtson, Stefan; Reguero, Marcelo Alfredo; Mörs, Thomas; An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods; Public Library of Science; Plos One; 12; 3; 3-2017; 1-20; e01721691932-6203CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0172169info:eu-repo/semantics/altIdentifier/url/http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0172169info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T14:24:04Zoai:ri.conicet.gov.ar:11336/49681instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982024-05-08 14:24:04.669CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
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