Two new angiosperm leaf morphotypes from the Anfiteatro de Ticó Formation (mid-Aptian) Santa Cruz Province, Argentina

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Floodplain deposits of the Anfiteatro de Ticó Formation (Baqueró Group, Aptian), in Patagonia (Argentina), are rich in plant remains and contain some of the oldest angiosperm records of southern Gondwana. Many gymnosperm and pteridophyte species, as well as three morphotypes of medium sized angiospe...

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Autores principales: Romero, E.J., Archangelsky, S., Passalia, M.G.
Formato: JOUR
Materias:
Anfiteatro de Ticó Formation
Angiosperm
Aptian
Baqueró Group
Cretaceous
Patagonia
angiosperm
evolutionary theory
fossil record
Gondwana
gymnosperm
leaf
leaf morphology
morphotype
new species
paleobotany
pteridophyte
skeletal remains
Argentina
Buenos Aires [Argentina]
Santa Cruz [Argentina]
Tigre [Buenos Aires]
Gymnospermae
Magnoliophyta
Pteridophyta
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00346667_v235_n_p148_Romero
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00346667_v235_n_p148_Romero2023-10-03T14:46:02Z Two new angiosperm leaf morphotypes from the Anfiteatro de Ticó Formation (mid-Aptian) Santa Cruz Province, Argentina Romero, E.J. Archangelsky, S. Passalia, M.G. Anfiteatro de Ticó Formation Angiosperm Aptian Baqueró Group Cretaceous Patagonia angiosperm Aptian evolutionary theory fossil record Gondwana gymnosperm leaf leaf morphology morphotype new species paleobotany pteridophyte skeletal remains Argentina Buenos Aires [Argentina] Patagonia Santa Cruz [Argentina] Tigre [Buenos Aires] Gymnospermae Magnoliophyta Pteridophyta Floodplain deposits of the Anfiteatro de Ticó Formation (Baqueró Group, Aptian), in Patagonia (Argentina), are rich in plant remains and contain some of the oldest angiosperm records of southern Gondwana. Many gymnosperm and pteridophyte species, as well as three morphotypes of medium sized angiosperm leaves, have already been described from this unit at different fossiliferous outcrops. We report two new angiosperm morphotypes from the Bajo Tigre locality. Both morphotypes (AT1 and AT2) consist of nano- to microphyllous leaves, nearly elliptic, with untoothed margins and pinnate brochidodromous venation. These leaves mostly exhibit characteristics of a high first or low second rank vein system. This combination of characters is associated with early angiosperm evolution. Morphotype AT1 is similar to one of the brochidodromous morphotypes from the La Cantera Formation (uppermost Aptian), which could be possibly conspecific. Morphotype AT2 has gross features already observed in leaf records from the younger Kachaike Formation (Albian ̶ lower Cenomanian) though they differ in lamina shape and secondary venation features. The angiosperm leaves of the Anfiteatro de Ticó Formation suggest that the early stages of angiosperm evolution in Patagonia had included forms with more than one type of growth habit. © 2016 JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00346667_v235_n_p148_Romero
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Anfiteatro de Ticó Formation
Angiosperm
Aptian
Baqueró Group
Cretaceous
Patagonia
angiosperm
Aptian
evolutionary theory
fossil record
Gondwana
gymnosperm
leaf
leaf morphology
morphotype
new species
paleobotany
pteridophyte
skeletal remains
Argentina
Buenos Aires [Argentina]
Patagonia
Santa Cruz [Argentina]
Tigre [Buenos Aires]
Gymnospermae
Magnoliophyta
Pteridophyta
spellingShingle Anfiteatro de Ticó Formation
Angiosperm
Aptian
Baqueró Group
Cretaceous
Patagonia
angiosperm
Aptian
evolutionary theory
fossil record
Gondwana
gymnosperm
leaf
leaf morphology
morphotype
new species
paleobotany
pteridophyte
skeletal remains
Argentina
Buenos Aires [Argentina]
Patagonia
Santa Cruz [Argentina]
Tigre [Buenos Aires]
Gymnospermae
Magnoliophyta
Pteridophyta
Romero, E.J.
Archangelsky, S.
Passalia, M.G.
Two new angiosperm leaf morphotypes from the Anfiteatro de Ticó Formation (mid-Aptian) Santa Cruz Province, Argentina
topic_facet Anfiteatro de Ticó Formation
Angiosperm
Aptian
Baqueró Group
Cretaceous
Patagonia
angiosperm
Aptian
evolutionary theory
fossil record
Gondwana
gymnosperm
leaf
leaf morphology
morphotype
new species
paleobotany
pteridophyte
skeletal remains
Argentina
Buenos Aires [Argentina]
Patagonia
Santa Cruz [Argentina]
Tigre [Buenos Aires]
Gymnospermae
Magnoliophyta
Pteridophyta
description Floodplain deposits of the Anfiteatro de Ticó Formation (Baqueró Group, Aptian), in Patagonia (Argentina), are rich in plant remains and contain some of the oldest angiosperm records of southern Gondwana. Many gymnosperm and pteridophyte species, as well as three morphotypes of medium sized angiosperm leaves, have already been described from this unit at different fossiliferous outcrops. We report two new angiosperm morphotypes from the Bajo Tigre locality. Both morphotypes (AT1 and AT2) consist of nano- to microphyllous leaves, nearly elliptic, with untoothed margins and pinnate brochidodromous venation. These leaves mostly exhibit characteristics of a high first or low second rank vein system. This combination of characters is associated with early angiosperm evolution. Morphotype AT1 is similar to one of the brochidodromous morphotypes from the La Cantera Formation (uppermost Aptian), which could be possibly conspecific. Morphotype AT2 has gross features already observed in leaf records from the younger Kachaike Formation (Albian ̶ lower Cenomanian) though they differ in lamina shape and secondary venation features. The angiosperm leaves of the Anfiteatro de Ticó Formation suggest that the early stages of angiosperm evolution in Patagonia had included forms with more than one type of growth habit. © 2016
format JOUR
author Romero, E.J.
Archangelsky, S.
Passalia, M.G.
author_facet Romero, E.J.
Archangelsky, S.
Passalia, M.G.
author_sort Romero, E.J.
title Two new angiosperm leaf morphotypes from the Anfiteatro de Ticó Formation (mid-Aptian) Santa Cruz Province, Argentina
title_short Two new angiosperm leaf morphotypes from the Anfiteatro de Ticó Formation (mid-Aptian) Santa Cruz Province, Argentina
title_full Two new angiosperm leaf morphotypes from the Anfiteatro de Ticó Formation (mid-Aptian) Santa Cruz Province, Argentina
title_fullStr Two new angiosperm leaf morphotypes from the Anfiteatro de Ticó Formation (mid-Aptian) Santa Cruz Province, Argentina
title_full_unstemmed Two new angiosperm leaf morphotypes from the Anfiteatro de Ticó Formation (mid-Aptian) Santa Cruz Province, Argentina
title_sort two new angiosperm leaf morphotypes from the anfiteatro de ticó formation (mid-aptian) santa cruz province, argentina
url http://hdl.handle.net/20.500.12110/paper_00346667_v235_n_p148_Romero
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AT archangelskys twonewangiospermleafmorphotypesfromtheanfiteatrodeticoformationmidaptiansantacruzprovinceargentina
AT passaliamg twonewangiospermleafmorphotypesfromtheanfiteatrodeticoformationmidaptiansantacruzprovinceargentina
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