A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica

Autores
Palópolo, Evangelina E.; Brezina, Soledad Silvana; Casadio, Silvio Alberto; Griffin, Miguel; Santillana, Sergio
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Fil: Palópolo, Evangelina. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Brezina, Soledad. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Casadio, Silvio. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Griffin, Miguel. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Buenos Aires, Argentina.
Fil: Santillana, Sergio. Instituto Antártico Argentino. Buenos Aires, Argentina.
New, well-preserved fossil starfish material is recorded from the Eocene La Meseta Formation exposed in Seymour Island, Antarctica. The use of new technology (i.e., microCT) on several fragments enabled the visualization of new characters and the differentiation of a new species, Zoroaster marambioensis sp. nov., which was previously identified as Zoroaster aff. Z. fulgens. Diagnostic characters of Z. marambioensis sp. nov. are (i) central disc plate enlarged, lobate and flattened, (ii) disc ring with enlarged, tumid radials and polygonal, flattened inter-radials, (iii) primary spines on disc only present on radials, (iv) oral armature with 1–3 primary spines and 1–2 secondary spines for each prominent adambulacral. The depositional setting represents the outer zone of an estuary dominated by marine processes affected by long lived hyperpycnal flows. We argue that zoroasterids colonized a distal part of the estuary under normal marine salinity and were killed by the input of freshwater carried by a hyperpycnal flow, and immediately buried by fine grained sandstone. Sedimentological data suggest that Z. marambioensis sp. nov. lived in shallow-water environments, it seems possible that they were adapted to higher temperatures than other Recent species of the genus, which inhabit cold, deep marine environments.
-
Materia
Ciencias Exactas y Naturales
Asteroidea
Zoroasteridae
Palaeoenvironment
Paleogene
La Meseta Formation
Antarctic Peninsula
Ciencias Exactas y Naturales
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
RID-UNRN (UNRN)
Institución
Universidad Nacional de Río Negro
OAI Identificador
oai:rid.unrn.edu.ar:20.500.12049/7248
Acceder
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oai_identifier_str oai:rid.unrn.edu.ar:20.500.12049/7248
network_acronym_str RIDUNRN
repository_id_str 4369
network_name_str RID-UNRN (UNRN)
spelling A new zoroasterid asteroid from the Eocene of Seymour Island, AntarcticaPalópolo, Evangelina E.Brezina, Soledad SilvanaCasadio, Silvio AlbertoGriffin, MiguelSantillana, SergioCiencias Exactas y NaturalesAsteroideaZoroasteridaePalaeoenvironmentPaleogeneLa Meseta FormationAntarctic PeninsulaCiencias Exactas y NaturalesFil: Palópolo, Evangelina. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.Fil: Brezina, Soledad. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.Fil: Casadio, Silvio. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.Fil: Griffin, Miguel. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Buenos Aires, Argentina.Fil: Santillana, Sergio. Instituto Antártico Argentino. Buenos Aires, Argentina.New, well-preserved fossil starfish material is recorded from the Eocene La Meseta Formation exposed in Seymour Island, Antarctica. The use of new technology (i.e., microCT) on several fragments enabled the visualization of new characters and the differentiation of a new species, Zoroaster marambioensis sp. nov., which was previously identified as Zoroaster aff. Z. fulgens. Diagnostic characters of Z. marambioensis sp. nov. are (i) central disc plate enlarged, lobate and flattened, (ii) disc ring with enlarged, tumid radials and polygonal, flattened inter-radials, (iii) primary spines on disc only present on radials, (iv) oral armature with 1–3 primary spines and 1–2 secondary spines for each prominent adambulacral. The depositional setting represents the outer zone of an estuary dominated by marine processes affected by long lived hyperpycnal flows. We argue that zoroasterids colonized a distal part of the estuary under normal marine salinity and were killed by the input of freshwater carried by a hyperpycnal flow, and immediately buried by fine grained sandstone. Sedimentological data suggest that Z. marambioensis sp. nov. lived in shallow-water environments, it seems possible that they were adapted to higher temperatures than other Recent species of the genus, which inhabit cold, deep marine environments.-Institute of Paleobiology Polish Academy of Sciences2021-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfPalópolo, E.E., Brezina, S.S., Casadio, S., Griffin, M., and Santillana, S. (2021). A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica. Acta Palaeontologica Polonica; 66; En prensa0567-79201732-2421http://www.app.pan.pl/article/item/app007142019.htmlhttp://rid.unrn.edu.ar/handle/20.500.12049/7248https://doi.org/10.4202/app.00714.2019enghttp://www.app.pan.pl/home.html66Acta Palaeontologica Polonicainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/4.0/reponame:RID-UNRN (UNRN)instname:Universidad Nacional de Río Negro2025-09-11T10:49:08Zoai:rid.unrn.edu.ar:20.500.12049/7248instacron:UNRNInstitucionalhttps://rid.unrn.edu.ar/jspui/Universidad públicaNo correspondehttps://rid.unrn.edu.ar/oai/snrdrid@unrn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:43692025-09-11 10:49:08.648RID-UNRN (UNRN) - Universidad Nacional de Río Negrofalse
dc.title.none.fl_str_mv A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
title A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
spellingShingle A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
Palópolo, Evangelina E.
Ciencias Exactas y Naturales
Asteroidea
Zoroasteridae
Palaeoenvironment
Paleogene
La Meseta Formation
Antarctic Peninsula
Ciencias Exactas y Naturales
title_short A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
title_full A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
title_fullStr A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
title_full_unstemmed A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
title_sort A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
dc.creator.none.fl_str_mv Palópolo, Evangelina E.
Brezina, Soledad Silvana
Casadio, Silvio Alberto
Griffin, Miguel
Santillana, Sergio
author Palópolo, Evangelina E.
author_facet Palópolo, Evangelina E.
Brezina, Soledad Silvana
Casadio, Silvio Alberto
Griffin, Miguel
Santillana, Sergio
author_role author
author2 Brezina, Soledad Silvana
Casadio, Silvio Alberto
Griffin, Miguel
Santillana, Sergio
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias Exactas y Naturales
Asteroidea
Zoroasteridae
Palaeoenvironment
Paleogene
La Meseta Formation
Antarctic Peninsula
Ciencias Exactas y Naturales
topic Ciencias Exactas y Naturales
Asteroidea
Zoroasteridae
Palaeoenvironment
Paleogene
La Meseta Formation
Antarctic Peninsula
Ciencias Exactas y Naturales
dc.description.none.fl_txt_mv Fil: Palópolo, Evangelina. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Brezina, Soledad. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Casadio, Silvio. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Griffin, Miguel. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Buenos Aires, Argentina.
Fil: Santillana, Sergio. Instituto Antártico Argentino. Buenos Aires, Argentina.
New, well-preserved fossil starfish material is recorded from the Eocene La Meseta Formation exposed in Seymour Island, Antarctica. The use of new technology (i.e., microCT) on several fragments enabled the visualization of new characters and the differentiation of a new species, Zoroaster marambioensis sp. nov., which was previously identified as Zoroaster aff. Z. fulgens. Diagnostic characters of Z. marambioensis sp. nov. are (i) central disc plate enlarged, lobate and flattened, (ii) disc ring with enlarged, tumid radials and polygonal, flattened inter-radials, (iii) primary spines on disc only present on radials, (iv) oral armature with 1–3 primary spines and 1–2 secondary spines for each prominent adambulacral. The depositional setting represents the outer zone of an estuary dominated by marine processes affected by long lived hyperpycnal flows. We argue that zoroasterids colonized a distal part of the estuary under normal marine salinity and were killed by the input of freshwater carried by a hyperpycnal flow, and immediately buried by fine grained sandstone. Sedimentological data suggest that Z. marambioensis sp. nov. lived in shallow-water environments, it seems possible that they were adapted to higher temperatures than other Recent species of the genus, which inhabit cold, deep marine environments.
-
description Fil: Palópolo, Evangelina. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
publishDate 2021
dc.date.none.fl_str_mv 2021-06
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 Palópolo, E.E., Brezina, S.S., Casadio, S., Griffin, M., and Santillana, S. (2021). A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica. Acta Palaeontologica Polonica; 66; En prensa
0567-7920
1732-2421
http://www.app.pan.pl/article/item/app007142019.html
http://rid.unrn.edu.ar/handle/20.500.12049/7248
https://doi.org/10.4202/app.00714.2019
identifier_str_mv Palópolo, E.E., Brezina, S.S., Casadio, S., Griffin, M., and Santillana, S. (2021). A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica. Acta Palaeontologica Polonica; 66; En prensa
0567-7920
1732-2421
url http://www.app.pan.pl/article/item/app007142019.html
http://rid.unrn.edu.ar/handle/20.500.12049/7248
https://doi.org/10.4202/app.00714.2019
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv http://www.app.pan.pl/home.html
66
Acta Palaeontologica Polonica
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Institute of Paleobiology Polish Academy of Sciences
publisher.none.fl_str_mv Institute of Paleobiology Polish Academy of Sciences
dc.source.none.fl_str_mv reponame:RID-UNRN (UNRN)
instname:Universidad Nacional de Río Negro
reponame_str RID-UNRN (UNRN)
collection RID-UNRN (UNRN)
instname_str Universidad Nacional de Río Negro
repository.name.fl_str_mv RID-UNRN (UNRN) - Universidad Nacional de Río Negro
repository.mail.fl_str_mv rid@unrn.edu.ar
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score 12.993085

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