Millerocaulis tekelili sp. nov., a new species of osmundalean fern from the Aptian Cerro Negro Formation (Antarctica)

A new species of the osmundalean fossil morphogenus Millerocaulis Tidwell emend. Vera, Millerocaulis tekelili sp. nov. is defined, based on several permineralized stems recovered from exposures of the Lower Cretaceous Cerro Negro Formation on Livingston Island, South Shetland Islands, Antarctica. Th...

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Detalles Bibliográficos
Autor principal:	Vera, Ezequiel Ignacio
Publicado:	2012
Materias:	Antarctica Byers Peninsula Cretaceous Livingston Island Millerocaulis Osmundaceae Pteridophyta Aptian fern fossil assemblage heterogeneity new record new species xylem South Shetland Islands Filicophyta Osmunda
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03115518_v36_n1_p35_Vera http://hdl.handle.net/20.500.12110/paper_03115518_v36_n1_p35_Vera
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_03115518_v36_n1_p35_Vera
record_format	dspace
spelling	paper:paper_03115518_v36_n1_p35_Vera2023-06-08T15:31:53Z Millerocaulis tekelili sp. nov., a new species of osmundalean fern from the Aptian Cerro Negro Formation (Antarctica) Vera, Ezequiel Ignacio Antarctica Byers Peninsula Cretaceous Livingston Island Millerocaulis Osmundaceae Pteridophyta Aptian Cretaceous fern fossil assemblage heterogeneity new record new species xylem Antarctica Livingston Island South Shetland Islands Filicophyta Millerocaulis Osmunda Osmundaceae Pteridophyta A new species of the osmundalean fossil morphogenus Millerocaulis Tidwell emend. Vera, Millerocaulis tekelili sp. nov. is defined, based on several permineralized stems recovered from exposures of the Lower Cretaceous Cerro Negro Formation on Livingston Island, South Shetland Islands, Antarctica. This new species is characterized by the presence of an ectophloic-dictyoxylic siphonostele, inner parenchymatic and outer sclerotic cortices, heterogeneous sclerotic ring in the petiole bases, absence of sclerenchyma associated with the petiolar xylem trace, petiolar inner cortex with sclerenchyma strands and stipular wings having a large sclerenchyma bundle and several smaller ones. The presence of non-homogeneous sclerotic rings in the petiole bases allows this new species to be clearly distinguished from other Antarctic Millerocaulis, and suggests that it may represent an intermediate form in the evolutionary lineage leading from Millerocaulis to subgenus Claytosmunda of Osmunda. © 2012 Copyright Taylor and Francis Group, LLC. Fil:Vera, E.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03115518_v36_n1_p35_Vera http://hdl.handle.net/20.500.12110/paper_03115518_v36_n1_p35_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 Byers Peninsula Cretaceous Livingston Island Millerocaulis Osmundaceae Pteridophyta Aptian Cretaceous fern fossil assemblage heterogeneity new record new species xylem Antarctica Livingston Island South Shetland Islands Filicophyta Millerocaulis Osmunda Osmundaceae Pteridophyta
spellingShingle	Antarctica Byers Peninsula Cretaceous Livingston Island Millerocaulis Osmundaceae Pteridophyta Aptian Cretaceous fern fossil assemblage heterogeneity new record new species xylem Antarctica Livingston Island South Shetland Islands Filicophyta Millerocaulis Osmunda Osmundaceae Pteridophyta Vera, Ezequiel Ignacio Millerocaulis tekelili sp. nov., a new species of osmundalean fern from the Aptian Cerro Negro Formation (Antarctica)
topic_facet	Antarctica Byers Peninsula Cretaceous Livingston Island Millerocaulis Osmundaceae Pteridophyta Aptian Cretaceous fern fossil assemblage heterogeneity new record new species xylem Antarctica Livingston Island South Shetland Islands Filicophyta Millerocaulis Osmunda Osmundaceae Pteridophyta
description	A new species of the osmundalean fossil morphogenus Millerocaulis Tidwell emend. Vera, Millerocaulis tekelili sp. nov. is defined, based on several permineralized stems recovered from exposures of the Lower Cretaceous Cerro Negro Formation on Livingston Island, South Shetland Islands, Antarctica. This new species is characterized by the presence of an ectophloic-dictyoxylic siphonostele, inner parenchymatic and outer sclerotic cortices, heterogeneous sclerotic ring in the petiole bases, absence of sclerenchyma associated with the petiolar xylem trace, petiolar inner cortex with sclerenchyma strands and stipular wings having a large sclerenchyma bundle and several smaller ones. The presence of non-homogeneous sclerotic rings in the petiole bases allows this new species to be clearly distinguished from other Antarctic Millerocaulis, and suggests that it may represent an intermediate form in the evolutionary lineage leading from Millerocaulis to subgenus Claytosmunda of Osmunda. © 2012 Copyright Taylor and Francis Group, LLC.
author	Vera, Ezequiel Ignacio
author_facet	Vera, Ezequiel Ignacio
author_sort	Vera, Ezequiel Ignacio
title	Millerocaulis tekelili sp. nov., a new species of osmundalean fern from the Aptian Cerro Negro Formation (Antarctica)
title_short	Millerocaulis tekelili sp. nov., a new species of osmundalean fern from the Aptian Cerro Negro Formation (Antarctica)
title_full	Millerocaulis tekelili sp. nov., a new species of osmundalean fern from the Aptian Cerro Negro Formation (Antarctica)
title_fullStr	Millerocaulis tekelili sp. nov., a new species of osmundalean fern from the Aptian Cerro Negro Formation (Antarctica)
title_full_unstemmed	Millerocaulis tekelili sp. nov., a new species of osmundalean fern from the Aptian Cerro Negro Formation (Antarctica)
title_sort	millerocaulis tekelili sp. nov., a new species of osmundalean fern from the aptian cerro negro formation (antarctica)
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03115518_v36_n1_p35_Vera http://hdl.handle.net/20.500.12110/paper_03115518_v36_n1_p35_Vera
work_keys_str_mv	AT veraezequielignacio millerocaulistekelilispnovanewspeciesofosmundaleanfernfromtheaptiancerronegroformationantarctica
_version_	1768544958624563200

Millerocaulis tekelili sp. nov., a new species of osmundalean fern from the Aptian Cerro Negro Formation (Antarctica)

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