New cyathealean tree fern, Yavanna chimaerica gen. et sp. nov., from the Early Cretaceous of Livingston Island, Antarctica

A new genus and species of cyathealean fern, Yavanna chimaerica gen. et sp. nov., is erected for several permineralized stems recovered from the Early Cretaceous (Aptian) Cerro Negro Formation, which crops out at the South Shetland Islands, Antarctica. The new species is characterized by solenosteli...

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Detalles Bibliográficos
Autor principal: Vera, E.I.
Formato: JOUR
Materias:
Antarctica
Aptian
Cerro Negro Formation
Cyatheales
Livingston Island
South Shetland Islands
anatomy
Cretaceous
fern
new genus
new species
Cyatheaceae
Filicophyta
Thyrsopteris elegans
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01956671_v44_n_p214_Vera
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01956671_v44_n_p214_Vera2023-10-03T15:09:30Z New cyathealean tree fern, Yavanna chimaerica gen. et sp. nov., from the Early Cretaceous of Livingston Island, Antarctica Vera, E.I. Antarctica Aptian Cerro Negro Formation Cyatheales Livingston Island South Shetland Islands anatomy Cretaceous fern new genus new species Antarctica Livingston Island South Shetland Islands Cyatheaceae Filicophyta Thyrsopteris elegans A new genus and species of cyathealean fern, Yavanna chimaerica gen. et sp. nov., is erected for several permineralized stems recovered from the Early Cretaceous (Aptian) Cerro Negro Formation, which crops out at the South Shetland Islands, Antarctica. The new species is characterized by solenostelic erect stems with medullary bundles traversing the pith, and surrounded by persistent petiole bases and adventitious roots. Proximal petiole bases present a one-parted modified omega-shaped trace, which becomes three-parted distally. The anatomy of the new fern show similarities with both Thyrsopteris elegans Kunze and with the Cyatheaceae s.s., suggesting that it is a representative of an extinct lineage among the Cyatheales. © 2013 Elsevier Ltd. Fil:Vera, E.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01956671_v44_n_p214_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
Aptian
Cerro Negro Formation
Cyatheales
Livingston Island
South Shetland Islands
anatomy
Cretaceous
fern
new genus
new species
Antarctica
Livingston Island
South Shetland Islands
Cyatheaceae
Filicophyta
Thyrsopteris elegans
spellingShingle Antarctica
Aptian
Cerro Negro Formation
Cyatheales
Livingston Island
South Shetland Islands
anatomy
Cretaceous
fern
new genus
new species
Antarctica
Livingston Island
South Shetland Islands
Cyatheaceae
Filicophyta
Thyrsopteris elegans
Vera, E.I.
New cyathealean tree fern, Yavanna chimaerica gen. et sp. nov., from the Early Cretaceous of Livingston Island, Antarctica
topic_facet Antarctica
Aptian
Cerro Negro Formation
Cyatheales
Livingston Island
South Shetland Islands
anatomy
Cretaceous
fern
new genus
new species
Antarctica
Livingston Island
South Shetland Islands
Cyatheaceae
Filicophyta
Thyrsopteris elegans
description A new genus and species of cyathealean fern, Yavanna chimaerica gen. et sp. nov., is erected for several permineralized stems recovered from the Early Cretaceous (Aptian) Cerro Negro Formation, which crops out at the South Shetland Islands, Antarctica. The new species is characterized by solenostelic erect stems with medullary bundles traversing the pith, and surrounded by persistent petiole bases and adventitious roots. Proximal petiole bases present a one-parted modified omega-shaped trace, which becomes three-parted distally. The anatomy of the new fern show similarities with both Thyrsopteris elegans Kunze and with the Cyatheaceae s.s., suggesting that it is a representative of an extinct lineage among the Cyatheales. © 2013 Elsevier Ltd.
format JOUR
author Vera, E.I.
author_facet Vera, E.I.
author_sort Vera, E.I.
title New cyathealean tree fern, Yavanna chimaerica gen. et sp. nov., from the Early Cretaceous of Livingston Island, Antarctica
title_short New cyathealean tree fern, Yavanna chimaerica gen. et sp. nov., from the Early Cretaceous of Livingston Island, Antarctica
title_full New cyathealean tree fern, Yavanna chimaerica gen. et sp. nov., from the Early Cretaceous of Livingston Island, Antarctica
title_fullStr New cyathealean tree fern, Yavanna chimaerica gen. et sp. nov., from the Early Cretaceous of Livingston Island, Antarctica
title_full_unstemmed New cyathealean tree fern, Yavanna chimaerica gen. et sp. nov., from the Early Cretaceous of Livingston Island, Antarctica
title_sort new cyathealean tree fern, yavanna chimaerica gen. et sp. nov., from the early cretaceous of livingston island, antarctica
url http://hdl.handle.net/20.500.12110/paper_01956671_v44_n_p214_Vera
work_keys_str_mv AT veraei newcyathealeantreefernyavannachimaericagenetspnovfromtheearlycretaceousoflivingstonislandantarctica
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