Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina

Autores
Hermsen, Elizabeth J.; Jud, Nathan A.; de Benedetti, Facundo; Gandolfo, Maria Alejandra
Año de publicación
2019
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Premise of research. While Azolla has a rich fossil record based on dispersed megaspore apparatuses and microspore massulae, fossil sporophytes are relatively rare. In this contribution, we describe two fossil Azolla species based on both sporophytes and spores from Chubut Province, Patagonia, Argentina: Azolla coloniensis De Benedetti & Zamaloa, emend. Hermsen et al., and A. keuja Jud et al., sp. nov. Azolla coloniensis and A. keuja are the first fossil species of Azolla to be represented by vegetative structures (i.e., leaves, stems, and roots) from both South America and the Southern Hemisphere. Methodology. We examined sporophyte material of A. coloniensis from the Cañadón del Irupé locality, Upper Cretaceous, La Colonia Formation, and A. keuja from the Palacio de los Loros locality PL-2, Paleocene, Salamanca Formation. Spores of A. keuja were obtained from a sporophyte specimen and its surrounding rock matrix. Material was studied using standard light microscopy, epifluorescence microscopy, and scanning electron microscopy. Fossils are held at the Museo Paleontológico Egidio Feruglio, Trelew, Chubut Province, Argentina. Pivotal results. Azolla coloniensis produced many-floated megaspore apparatuses and microspore massulae with anchor-tipped glochidia, placing it in the fossil Azolla section Florschuetzia. Azolla keuja sporophytes are structurally similar to those produced by the extant African species A. nilotica and the Late Cretaceous–Paleocene North American species A. schopfii in overall size, growth form, leaf structure, and production of fascicled roots; while all three taxa produce similar microspore massulae, the structure of their megaspore apparatuses differ. Azolla keuja cannot be assigned to any section of Azolla. Conclusions. Azolla coloniensis and A. keuja are important because they provide two new organismal concepts for extinct species of Azolla. Our inability to fully classify A. keuja to section, in combination with the great morphological diversity of fossil Azolla, indicates that a comprehensive reevaluation of phylogeny and taxonomy that incorporates both extant and fossil species is needed.
Fil: Hermsen, Elizabeth J.. No especifíca;
Fil: Jud, Nathan A.. Williams College; Estados Unidos
Fil: de Benedetti, Facundo. Museo Paleontologico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Gandolfo, Maria Alejandra. Cornell University; Estados Unidos
Materia
CHUBUT PROVINCE
LA COLONIA FORMATION
SALAMANCA FORMATION
SALVINIACEAE
SALVINIALES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/163111
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/163111
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, ArgentinaHermsen, Elizabeth J.Jud, Nathan A.de Benedetti, FacundoGandolfo, Maria AlejandraCHUBUT PROVINCELA COLONIA FORMATIONSALAMANCA FORMATIONSALVINIACEAESALVINIALEShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Premise of research. While Azolla has a rich fossil record based on dispersed megaspore apparatuses and microspore massulae, fossil sporophytes are relatively rare. In this contribution, we describe two fossil Azolla species based on both sporophytes and spores from Chubut Province, Patagonia, Argentina: Azolla coloniensis De Benedetti & Zamaloa, emend. Hermsen et al., and A. keuja Jud et al., sp. nov. Azolla coloniensis and A. keuja are the first fossil species of Azolla to be represented by vegetative structures (i.e., leaves, stems, and roots) from both South America and the Southern Hemisphere. Methodology. We examined sporophyte material of A. coloniensis from the Cañadón del Irupé locality, Upper Cretaceous, La Colonia Formation, and A. keuja from the Palacio de los Loros locality PL-2, Paleocene, Salamanca Formation. Spores of A. keuja were obtained from a sporophyte specimen and its surrounding rock matrix. Material was studied using standard light microscopy, epifluorescence microscopy, and scanning electron microscopy. Fossils are held at the Museo Paleontológico Egidio Feruglio, Trelew, Chubut Province, Argentina. Pivotal results. Azolla coloniensis produced many-floated megaspore apparatuses and microspore massulae with anchor-tipped glochidia, placing it in the fossil Azolla section Florschuetzia. Azolla keuja sporophytes are structurally similar to those produced by the extant African species A. nilotica and the Late Cretaceous–Paleocene North American species A. schopfii in overall size, growth form, leaf structure, and production of fascicled roots; while all three taxa produce similar microspore massulae, the structure of their megaspore apparatuses differ. Azolla keuja cannot be assigned to any section of Azolla. Conclusions. Azolla coloniensis and A. keuja are important because they provide two new organismal concepts for extinct species of Azolla. Our inability to fully classify A. keuja to section, in combination with the great morphological diversity of fossil Azolla, indicates that a comprehensive reevaluation of phylogeny and taxonomy that incorporates both extant and fossil species is needed.Fil: Hermsen, Elizabeth J.. No especifíca;Fil: Jud, Nathan A.. Williams College; Estados UnidosFil: de Benedetti, Facundo. Museo Paleontologico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gandolfo, Maria Alejandra. Cornell University; Estados UnidosUniversity of Chicago Press2019-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/163111Hermsen, Elizabeth J.; Jud, Nathan A.; de Benedetti, Facundo; Gandolfo, Maria Alejandra; Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina; University of Chicago Press; International Journal of Plant Sciences; 180; 7; 9-2019; 737-7541058-5893CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.journals.uchicago.edu/doi/abs/10.1086/704377info:eu-repo/semantics/altIdentifier/doi/10.1086/704377info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:03:55Zoai:ri.conicet.gov.ar:11336/163111instacron: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:34982025-09-29 10:03:55.716CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina
title Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina
spellingShingle Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina
Hermsen, Elizabeth J.
CHUBUT PROVINCE
LA COLONIA FORMATION
SALAMANCA FORMATION
SALVINIACEAE
SALVINIALES
title_short Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina
title_full Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina
title_fullStr Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina
title_full_unstemmed Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina
title_sort Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina
dc.creator.none.fl_str_mv Hermsen, Elizabeth J.
Jud, Nathan A.
de Benedetti, Facundo
Gandolfo, Maria Alejandra
author Hermsen, Elizabeth J.
author_facet Hermsen, Elizabeth J.
Jud, Nathan A.
de Benedetti, Facundo
Gandolfo, Maria Alejandra
author_role author
author2 Jud, Nathan A.
de Benedetti, Facundo
Gandolfo, Maria Alejandra
author2_role author
author
author
dc.subject.none.fl_str_mv CHUBUT PROVINCE
LA COLONIA FORMATION
SALAMANCA FORMATION
SALVINIACEAE
SALVINIALES
topic CHUBUT PROVINCE
LA COLONIA FORMATION
SALAMANCA FORMATION
SALVINIACEAE
SALVINIALES
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Premise of research. While Azolla has a rich fossil record based on dispersed megaspore apparatuses and microspore massulae, fossil sporophytes are relatively rare. In this contribution, we describe two fossil Azolla species based on both sporophytes and spores from Chubut Province, Patagonia, Argentina: Azolla coloniensis De Benedetti & Zamaloa, emend. Hermsen et al., and A. keuja Jud et al., sp. nov. Azolla coloniensis and A. keuja are the first fossil species of Azolla to be represented by vegetative structures (i.e., leaves, stems, and roots) from both South America and the Southern Hemisphere. Methodology. We examined sporophyte material of A. coloniensis from the Cañadón del Irupé locality, Upper Cretaceous, La Colonia Formation, and A. keuja from the Palacio de los Loros locality PL-2, Paleocene, Salamanca Formation. Spores of A. keuja were obtained from a sporophyte specimen and its surrounding rock matrix. Material was studied using standard light microscopy, epifluorescence microscopy, and scanning electron microscopy. Fossils are held at the Museo Paleontológico Egidio Feruglio, Trelew, Chubut Province, Argentina. Pivotal results. Azolla coloniensis produced many-floated megaspore apparatuses and microspore massulae with anchor-tipped glochidia, placing it in the fossil Azolla section Florschuetzia. Azolla keuja sporophytes are structurally similar to those produced by the extant African species A. nilotica and the Late Cretaceous–Paleocene North American species A. schopfii in overall size, growth form, leaf structure, and production of fascicled roots; while all three taxa produce similar microspore massulae, the structure of their megaspore apparatuses differ. Azolla keuja cannot be assigned to any section of Azolla. Conclusions. Azolla coloniensis and A. keuja are important because they provide two new organismal concepts for extinct species of Azolla. Our inability to fully classify A. keuja to section, in combination with the great morphological diversity of fossil Azolla, indicates that a comprehensive reevaluation of phylogeny and taxonomy that incorporates both extant and fossil species is needed.
Fil: Hermsen, Elizabeth J.. No especifíca;
Fil: Jud, Nathan A.. Williams College; Estados Unidos
Fil: de Benedetti, Facundo. Museo Paleontologico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Gandolfo, Maria Alejandra. Cornell University; Estados Unidos
description Premise of research. While Azolla has a rich fossil record based on dispersed megaspore apparatuses and microspore massulae, fossil sporophytes are relatively rare. In this contribution, we describe two fossil Azolla species based on both sporophytes and spores from Chubut Province, Patagonia, Argentina: Azolla coloniensis De Benedetti & Zamaloa, emend. Hermsen et al., and A. keuja Jud et al., sp. nov. Azolla coloniensis and A. keuja are the first fossil species of Azolla to be represented by vegetative structures (i.e., leaves, stems, and roots) from both South America and the Southern Hemisphere. Methodology. We examined sporophyte material of A. coloniensis from the Cañadón del Irupé locality, Upper Cretaceous, La Colonia Formation, and A. keuja from the Palacio de los Loros locality PL-2, Paleocene, Salamanca Formation. Spores of A. keuja were obtained from a sporophyte specimen and its surrounding rock matrix. Material was studied using standard light microscopy, epifluorescence microscopy, and scanning electron microscopy. Fossils are held at the Museo Paleontológico Egidio Feruglio, Trelew, Chubut Province, Argentina. Pivotal results. Azolla coloniensis produced many-floated megaspore apparatuses and microspore massulae with anchor-tipped glochidia, placing it in the fossil Azolla section Florschuetzia. Azolla keuja sporophytes are structurally similar to those produced by the extant African species A. nilotica and the Late Cretaceous–Paleocene North American species A. schopfii in overall size, growth form, leaf structure, and production of fascicled roots; while all three taxa produce similar microspore massulae, the structure of their megaspore apparatuses differ. Azolla keuja cannot be assigned to any section of Azolla. Conclusions. Azolla coloniensis and A. keuja are important because they provide two new organismal concepts for extinct species of Azolla. Our inability to fully classify A. keuja to section, in combination with the great morphological diversity of fossil Azolla, indicates that a comprehensive reevaluation of phylogeny and taxonomy that incorporates both extant and fossil species is needed.
publishDate 2019
dc.date.none.fl_str_mv 2019-09
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/11336/163111
Hermsen, Elizabeth J.; Jud, Nathan A.; de Benedetti, Facundo; Gandolfo, Maria Alejandra; Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina; University of Chicago Press; International Journal of Plant Sciences; 180; 7; 9-2019; 737-754
1058-5893
CONICET Digital
CONICET
url http://hdl.handle.net/11336/163111
identifier_str_mv Hermsen, Elizabeth J.; Jud, Nathan A.; de Benedetti, Facundo; Gandolfo, Maria Alejandra; Azolla sporophytes and spores from the late cretaceous and Paleocene of Patagonia, Argentina; University of Chicago Press; International Journal of Plant Sciences; 180; 7; 9-2019; 737-754
1058-5893
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.journals.uchicago.edu/doi/abs/10.1086/704377
info:eu-repo/semantics/altIdentifier/doi/10.1086/704377
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 University of Chicago Press
publisher.none.fl_str_mv University of Chicago Press
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
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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score 13.070432

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