Further evidence supporting high diversity of cyathealean tree ferns in the Early Cretaceous of Antarctica

Two new specimens of a cyathealean fern stems collected from the Lower Cretaceous (Aptian) Cerro Negro Formation, which crops out at the South Shetland Islands, Antarctica, are described in detail. The specimens are dictyostelic stems with U-shaped meristeles without sclerenchyma sheaths and petiole...

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Autor principal:	Vera, Ezequiel Ignacio
Publicado:	2015
Materias:	Antarctica Cerro Negro Formation Cibotiaceae Cyatheaceae Cyatheales Fossils Lower Cretaceous Tree ferns Aptian Cretaceous fern fossil record paleobiogeography paleobotany paleoclimate paleoenvironment paleontology species diversity South Shetland Islands Filicophyta
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v56_n_p141_Vera http://hdl.handle.net/20.500.12110/paper_01956671_v56_n_p141_Vera
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_01956671_v56_n_p141_Vera
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spelling	paper:paper_01956671_v56_n_p141_Vera2023-06-08T15:20:19Z Further evidence supporting high diversity of cyathealean tree ferns in the Early Cretaceous of Antarctica Vera, Ezequiel Ignacio Antarctica Cerro Negro Formation Cibotiaceae Cyatheaceae Cyatheales Fossils Lower Cretaceous Tree ferns Aptian Cretaceous fern fossil record paleobiogeography paleobotany paleoclimate paleoenvironment paleontology species diversity Antarctica South Shetland Islands Cyatheaceae Filicophyta Two new specimens of a cyathealean fern stems collected from the Lower Cretaceous (Aptian) Cerro Negro Formation, which crops out at the South Shetland Islands, Antarctica, are described in detail. The specimens are dictyostelic stems with U-shaped meristeles without sclerenchyma sheaths and petiole bases with numerous, small, vascular strands, and a mantle of adventitious roots. The anatomy of the stems show similarities with Cibotiaceae, but given they are not well preserved, some critical features that would allow a conclusive referral to this family are lacking. Preserved in the surrounding matrix, fragmentary pinnules were found, showing sori with bivalvate indusia, and sporangia with more than 20 spores, attached to an elongate receptacle. The features observed in these fertile remains suggest cyathealean affinities, but are difficult to refer to a particular family. These findings increase the diversity of cyathealean tree ferns in the Cerro Negro Formation, supporting previously suggested warm climatic conditions for this region of Antarctica during the Aptian. © 2015 Elsevier Ltd. Fil:Vera, E.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v56_n_p141_Vera http://hdl.handle.net/20.500.12110/paper_01956671_v56_n_p141_Vera
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Antarctica Cerro Negro Formation Cibotiaceae Cyatheaceae Cyatheales Fossils Lower Cretaceous Tree ferns Aptian Cretaceous fern fossil record paleobiogeography paleobotany paleoclimate paleoenvironment paleontology species diversity Antarctica South Shetland Islands Cyatheaceae Filicophyta
spellingShingle	Antarctica Cerro Negro Formation Cibotiaceae Cyatheaceae Cyatheales Fossils Lower Cretaceous Tree ferns Aptian Cretaceous fern fossil record paleobiogeography paleobotany paleoclimate paleoenvironment paleontology species diversity Antarctica South Shetland Islands Cyatheaceae Filicophyta Vera, Ezequiel Ignacio Further evidence supporting high diversity of cyathealean tree ferns in the Early Cretaceous of Antarctica
topic_facet	Antarctica Cerro Negro Formation Cibotiaceae Cyatheaceae Cyatheales Fossils Lower Cretaceous Tree ferns Aptian Cretaceous fern fossil record paleobiogeography paleobotany paleoclimate paleoenvironment paleontology species diversity Antarctica South Shetland Islands Cyatheaceae Filicophyta
description	Two new specimens of a cyathealean fern stems collected from the Lower Cretaceous (Aptian) Cerro Negro Formation, which crops out at the South Shetland Islands, Antarctica, are described in detail. The specimens are dictyostelic stems with U-shaped meristeles without sclerenchyma sheaths and petiole bases with numerous, small, vascular strands, and a mantle of adventitious roots. The anatomy of the stems show similarities with Cibotiaceae, but given they are not well preserved, some critical features that would allow a conclusive referral to this family are lacking. Preserved in the surrounding matrix, fragmentary pinnules were found, showing sori with bivalvate indusia, and sporangia with more than 20 spores, attached to an elongate receptacle. The features observed in these fertile remains suggest cyathealean affinities, but are difficult to refer to a particular family. These findings increase the diversity of cyathealean tree ferns in the Cerro Negro Formation, supporting previously suggested warm climatic conditions for this region of Antarctica during the Aptian. © 2015 Elsevier Ltd.
author	Vera, Ezequiel Ignacio
author_facet	Vera, Ezequiel Ignacio
author_sort	Vera, Ezequiel Ignacio
title	Further evidence supporting high diversity of cyathealean tree ferns in the Early Cretaceous of Antarctica
title_short	Further evidence supporting high diversity of cyathealean tree ferns in the Early Cretaceous of Antarctica
title_full	Further evidence supporting high diversity of cyathealean tree ferns in the Early Cretaceous of Antarctica
title_fullStr	Further evidence supporting high diversity of cyathealean tree ferns in the Early Cretaceous of Antarctica
title_full_unstemmed	Further evidence supporting high diversity of cyathealean tree ferns in the Early Cretaceous of Antarctica
title_sort	further evidence supporting high diversity of cyathealean tree ferns in the early cretaceous of antarctica
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v56_n_p141_Vera http://hdl.handle.net/20.500.12110/paper_01956671_v56_n_p141_Vera
work_keys_str_mv	AT veraezequielignacio furtherevidencesupportinghighdiversityofcyathealeantreefernsintheearlycretaceousofantarctica
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Further evidence supporting high diversity of cyathealean tree ferns in the Early Cretaceous of Antarctica

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