Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology
- Autores
- Channing, Alan; Zamuner, Alba Berta; Edwards, Dianne; Guido, Diego Martín
- Año de publicación
- 2011
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Premise of the study: Dated molecular phylogenies suggest a Cenozoic origin for the crown group of Equisetum . but compression fossil equisetaleans that are morphologically indistinguishable from extant Equisetum and recently discovered anatomically preserved examples strongly suggest an earlier Mesozoic initial diversifi cation. Methods: In situ samples of Equisetum thermale sp. nov. from the Upper Jurassic San Agust í n hot spring deposit were collected and studied with the use of polished blocks, thin sections, and light microscopy. Key results: Equisetum thermale exhibits all the morphological and anatomical characteristics of the extant crown group Equisetum . It shows a mixture of features present in the two extant subgenera, e.g., superfi cial stomata typical of subgenus Equisetum allied with infrequently ramifying stems typical of subgenus Hippochaete . This appears to ally E . thermale with the least derived extant species in the genus Equisetum bogotense (sister species to the two subgenera). Its association of hydromorphic and xeromorphic characters allowed it to grow as an emergent aquatic in physically and chemically stressed geothermally infl uenced wetlands, where it formed dense monospecifi c stands. Equisetum thermale , because it is preserved in situ with intact anatomy, provides clear paleoecological, biological, plus inferred paleoecophysiological evidence of adaptations known in extant species. Conclusions: As the earliest unequivocal member of the genus, E. thermale supports the hypothesis of a Mesozoic origin. Its inferred tolerance of a similar range of stresses (e.g., high salinity, alkalinity, and heavy metal concentrations) to that seen in extant Equisetum suggests early evolution and subsequent maintenance of ecophysiological innovations in the genus.
Facultad de Ciencias Naturales y Museo - Materia
-
Ciencias Naturales
Equisetites
Equisetum
fossil
geothermal wetland
hot spring
Late Jurassic
paleoecophysiology
silica - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-nd/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/176750
Ver los metadatos del registro completo
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Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiologyChanning, AlanZamuner, Alba BertaEdwards, DianneGuido, Diego MartínCiencias NaturalesEquisetitesEquisetumfossilgeothermal wetlandhot springLate JurassicpaleoecophysiologysilicaPremise of the study: Dated molecular phylogenies suggest a Cenozoic origin for the crown group of Equisetum . but compression fossil equisetaleans that are morphologically indistinguishable from extant Equisetum and recently discovered anatomically preserved examples strongly suggest an earlier Mesozoic initial diversifi cation. Methods: In situ samples of Equisetum thermale sp. nov. from the Upper Jurassic San Agust í n hot spring deposit were collected and studied with the use of polished blocks, thin sections, and light microscopy. Key results: Equisetum thermale exhibits all the morphological and anatomical characteristics of the extant crown group Equisetum . It shows a mixture of features present in the two extant subgenera, e.g., superfi cial stomata typical of subgenus Equisetum allied with infrequently ramifying stems typical of subgenus Hippochaete . This appears to ally E . thermale with the least derived extant species in the genus Equisetum bogotense (sister species to the two subgenera). Its association of hydromorphic and xeromorphic characters allowed it to grow as an emergent aquatic in physically and chemically stressed geothermally infl uenced wetlands, where it formed dense monospecifi c stands. Equisetum thermale , because it is preserved in situ with intact anatomy, provides clear paleoecological, biological, plus inferred paleoecophysiological evidence of adaptations known in extant species. Conclusions: As the earliest unequivocal member of the genus, E. thermale supports the hypothesis of a Mesozoic origin. Its inferred tolerance of a similar range of stresses (e.g., high salinity, alkalinity, and heavy metal concentrations) to that seen in extant Equisetum suggests early evolution and subsequent maintenance of ecophysiological innovations in the genus.Facultad de Ciencias Naturales y Museo2011info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf680-697http://sedici.unlp.edu.ar/handle/10915/176750enginfo:eu-repo/semantics/altIdentifier/issn/0002-9122info:eu-repo/semantics/altIdentifier/doi/10.3732/ajb.1000211info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:47:43Zoai:sedici.unlp.edu.ar:10915/176750Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:47:43.533SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology |
title |
Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology |
spellingShingle |
Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology Channing, Alan Ciencias Naturales Equisetites Equisetum fossil geothermal wetland hot spring Late Jurassic paleoecophysiology silica |
title_short |
Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology |
title_full |
Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology |
title_fullStr |
Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology |
title_full_unstemmed |
Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology |
title_sort |
Equisetum thermale sp. nov. (Equisetales) from the Jurassic San Agustín hot spring deposit, Patagonia: anatomy, paleoecology, and inferred paleoecophysiology |
dc.creator.none.fl_str_mv |
Channing, Alan Zamuner, Alba Berta Edwards, Dianne Guido, Diego Martín |
author |
Channing, Alan |
author_facet |
Channing, Alan Zamuner, Alba Berta Edwards, Dianne Guido, Diego Martín |
author_role |
author |
author2 |
Zamuner, Alba Berta Edwards, Dianne Guido, Diego Martín |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Ciencias Naturales Equisetites Equisetum fossil geothermal wetland hot spring Late Jurassic paleoecophysiology silica |
topic |
Ciencias Naturales Equisetites Equisetum fossil geothermal wetland hot spring Late Jurassic paleoecophysiology silica |
dc.description.none.fl_txt_mv |
Premise of the study: Dated molecular phylogenies suggest a Cenozoic origin for the crown group of Equisetum . but compression fossil equisetaleans that are morphologically indistinguishable from extant Equisetum and recently discovered anatomically preserved examples strongly suggest an earlier Mesozoic initial diversifi cation. Methods: In situ samples of Equisetum thermale sp. nov. from the Upper Jurassic San Agust í n hot spring deposit were collected and studied with the use of polished blocks, thin sections, and light microscopy. Key results: Equisetum thermale exhibits all the morphological and anatomical characteristics of the extant crown group Equisetum . It shows a mixture of features present in the two extant subgenera, e.g., superfi cial stomata typical of subgenus Equisetum allied with infrequently ramifying stems typical of subgenus Hippochaete . This appears to ally E . thermale with the least derived extant species in the genus Equisetum bogotense (sister species to the two subgenera). Its association of hydromorphic and xeromorphic characters allowed it to grow as an emergent aquatic in physically and chemically stressed geothermally infl uenced wetlands, where it formed dense monospecifi c stands. Equisetum thermale , because it is preserved in situ with intact anatomy, provides clear paleoecological, biological, plus inferred paleoecophysiological evidence of adaptations known in extant species. Conclusions: As the earliest unequivocal member of the genus, E. thermale supports the hypothesis of a Mesozoic origin. Its inferred tolerance of a similar range of stresses (e.g., high salinity, alkalinity, and heavy metal concentrations) to that seen in extant Equisetum suggests early evolution and subsequent maintenance of ecophysiological innovations in the genus. Facultad de Ciencias Naturales y Museo |
description |
Premise of the study: Dated molecular phylogenies suggest a Cenozoic origin for the crown group of Equisetum . but compression fossil equisetaleans that are morphologically indistinguishable from extant Equisetum and recently discovered anatomically preserved examples strongly suggest an earlier Mesozoic initial diversifi cation. Methods: In situ samples of Equisetum thermale sp. nov. from the Upper Jurassic San Agust í n hot spring deposit were collected and studied with the use of polished blocks, thin sections, and light microscopy. Key results: Equisetum thermale exhibits all the morphological and anatomical characteristics of the extant crown group Equisetum . It shows a mixture of features present in the two extant subgenera, e.g., superfi cial stomata typical of subgenus Equisetum allied with infrequently ramifying stems typical of subgenus Hippochaete . This appears to ally E . thermale with the least derived extant species in the genus Equisetum bogotense (sister species to the two subgenera). Its association of hydromorphic and xeromorphic characters allowed it to grow as an emergent aquatic in physically and chemically stressed geothermally infl uenced wetlands, where it formed dense monospecifi c stands. Equisetum thermale , because it is preserved in situ with intact anatomy, provides clear paleoecological, biological, plus inferred paleoecophysiological evidence of adaptations known in extant species. Conclusions: As the earliest unequivocal member of the genus, E. thermale supports the hypothesis of a Mesozoic origin. Its inferred tolerance of a similar range of stresses (e.g., high salinity, alkalinity, and heavy metal concentrations) to that seen in extant Equisetum suggests early evolution and subsequent maintenance of ecophysiological innovations in the genus. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
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publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/176750 |
url |
http://sedici.unlp.edu.ar/handle/10915/176750 |
dc.language.none.fl_str_mv |
eng |
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eng |
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info:eu-repo/semantics/altIdentifier/issn/0002-9122 info:eu-repo/semantics/altIdentifier/doi/10.3732/ajb.1000211 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) |
eu_rights_str_mv |
openAccess |
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http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) |
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