Notonuphar antarctica, an extinct water lily (Nymphaeales) from the Eocene of Antarctica

A new genus and species, Notonuphar antarctica, is described from the Eocene of Seymour (Marambio) Island, the Antarctic Peninsula and assigned to the Nymphaeales based on well-preserved seeds. This is the first record of a water lily from Antarctica and the first record of a Gondwanan plant with cl...

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Detalles Bibliográficos
Autores principales: Friis, Else M., Iglesias, Ari, Reguero, Marcelo Alfredo, Mörs, Thomas
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Biología
basal angiosperms
fossil seeds
Gondwana
Nuphar
paleogene
Antarctic Peninsula
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/78166
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-78166
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
basal angiosperms
fossil seeds
Gondwana
Nuphar
paleogene
Antarctic Peninsula
spellingShingle Biología
basal angiosperms
fossil seeds
Gondwana
Nuphar
paleogene
Antarctic Peninsula
Friis, Else M.
Iglesias, Ari
Reguero, Marcelo Alfredo
Mörs, Thomas
Notonuphar antarctica, an extinct water lily (Nymphaeales) from the Eocene of Antarctica
topic_facet Biología
basal angiosperms
fossil seeds
Gondwana
Nuphar
paleogene
Antarctic Peninsula
description A new genus and species, Notonuphar antarctica, is described from the Eocene of Seymour (Marambio) Island, the Antarctic Peninsula and assigned to the Nymphaeales based on well-preserved seeds. This is the first record of a water lily from Antarctica and the first record of a Gondwanan plant with close link to the genus Nuphar (Nymphaeaceae), which is restricted today to the Northern Hemisphere. Critical features for systematic placement of Notonuphar are the presence of a germination cap with closely spaced hilar scar and micropyle, anatropous, bitegmic and exotestal seed organization, exotesta composed of one cell layer of high sclerenchymatic palisadeshape cells, mesotesta of smaller, low parenchymatic cells, a few cell layers deep, and a thin tegmen. The seeds of Notonuphar are particularly similar to seeds of extant and fossil Nuphar in the straight, unfolded anticlinal wall of the exotestal cells and the presence of a narrow zone of exotestal tissue between hilum and micropyle. Other seed features including the very tall exotestal cells and strongly thickened cell walls of exotesta also link Notonuphar to Brasenia and related fossil taxa (Cabombaceae). This character mosaic observed in Notonuphar corroborates the transitional position of Nuphar between Cabombaceae and Nymphaeaceae. Notonuphar is the only member of Nymphaeales recorded from Antarctica and so far the only fossil seeds of Nymphaeales known from the Southern Hemisphere. The discovery of this extinct Gondwanan taxon with features suggesting close relationship with extant Northern Hemisphere genus Nuphar is a further evidence for the relictual nature of the extant group.
format Articulo
Articulo
author Friis, Else M.
Iglesias, Ari
Reguero, Marcelo Alfredo
Mörs, Thomas
author_facet Friis, Else M.
Iglesias, Ari
Reguero, Marcelo Alfredo
Mörs, Thomas
author_sort Friis, Else M.
title Notonuphar antarctica, an extinct water lily (Nymphaeales) from the Eocene of Antarctica
title_short Notonuphar antarctica, an extinct water lily (Nymphaeales) from the Eocene of Antarctica
title_full Notonuphar antarctica, an extinct water lily (Nymphaeales) from the Eocene of Antarctica
title_fullStr Notonuphar antarctica, an extinct water lily (Nymphaeales) from the Eocene of Antarctica
title_full_unstemmed Notonuphar antarctica, an extinct water lily (Nymphaeales) from the Eocene of Antarctica
title_sort notonuphar antarctica, an extinct water lily (nymphaeales) from the eocene of antarctica
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/78166
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AT regueromarceloalfredo notonupharantarcticaanextinctwaterlilynymphaealesfromtheeoceneofantarctica
AT morsthomas notonupharantarcticaanextinctwaterlilynymphaealesfromtheeoceneofantarctica
bdutipo_str Repositorios
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