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, Ezequiel Ignacio
Publicado:	2013
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:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v44_n_p214_Vera 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

id	paper:paper_01956671_v44_n_p214_Vera
record_format	dspace
spelling	paper:paper_01956671_v44_n_p214_Vera2025-07-30T17:58:44Z New cyathealean tree fern, Yavanna chimaerica gen. et sp. nov., from the Early Cretaceous of Livingston Island, Antarctica Vera, Ezequiel Ignacio 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. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v44_n_p214_Vera 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, Ezequiel Ignacio 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.
author	Vera, Ezequiel Ignacio
author_facet	Vera, Ezequiel Ignacio
author_sort	Vera, Ezequiel Ignacio
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
publishDate	2013
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v44_n_p214_Vera http://hdl.handle.net/20.500.12110/paper_01956671_v44_n_p214_Vera
work_keys_str_mv	AT veraezequielignacio newcyathealeantreefernyavannachimaericagenetspnovfromtheearlycretaceousoflivingstonislandantarctica
_version_	1840327222803562496

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

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