A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica

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New, well-preserved fossil starfish material is recorded from the Eocene La Meseta Formation exposed in Seymour Island, Antarctica. The use of new technology (i.e., microCT) on several fragments enabled the visualization of new characters and the differentiation of a new species, Zoroaster marambioe...

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Autores principales: Palópolo, Evangelina E., Brezina, Soledad Silvana, Casadio, Silvio A., Griffin, Miguel, Santillana, Sergio
Formato: Articulo
Lenguaje:Español
Publicado: 2021
Materias:
Paleontología
Asteroidea
Zoroasteridae
palaeoenvironment
Paleogene
La Meseta Formation
Antarctic Peninsula
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/142781
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-142781
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Paleontología
Asteroidea
Zoroasteridae
palaeoenvironment
Paleogene
La Meseta Formation
Antarctic Peninsula
spellingShingle Paleontología
Asteroidea
Zoroasteridae
palaeoenvironment
Paleogene
La Meseta Formation
Antarctic Peninsula
Palópolo, Evangelina E.
Brezina, Soledad Silvana
Casadio, Silvio A.
Griffin, Miguel
Santillana, Sergio
A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
topic_facet Paleontología
Asteroidea
Zoroasteridae
palaeoenvironment
Paleogene
La Meseta Formation
Antarctic Peninsula
description New, well-preserved fossil starfish material is recorded from the Eocene La Meseta Formation exposed in Seymour Island, Antarctica. The use of new technology (i.e., microCT) on several fragments enabled the visualization of new characters and the differentiation of a new species, Zoroaster marambioensis sp. nov., which was previously identified as Zoroaster aff. Z. fulgens. Diagnostic characters of Z. marambioensis sp. nov. are (i) central disc plate enlarged, lobate and flattened, (ii) disc ring with enlarged, tumid radials and polygonal, flattened inter-radials, (iii) primary spines on disc only present on radials, (iv) oral armature with 1–3 primary spines and 1–2 secondary spines for each prominent adambulacral. The depositional setting represents the outer zone of an estuary dominated by marine processes affected by long lived hyperpycnal flows. We argue that zoroasterids colonized a distal part of the estuary under normal marine salinity and were killed by the input of freshwater carried by a hyperpycnal flow, and immediately buried by fine grained sandstone. Sedimentological data suggest that Z. marambioensis sp. nov. lived in shallow-water environments, it seems possible that they were adapted to higher temperatures than other Recent species of the genus, which inhabit cold, deep marine environments.
format Articulo
Articulo
author Palópolo, Evangelina E.
Brezina, Soledad Silvana
Casadio, Silvio A.
Griffin, Miguel
Santillana, Sergio
author_facet Palópolo, Evangelina E.
Brezina, Soledad Silvana
Casadio, Silvio A.
Griffin, Miguel
Santillana, Sergio
author_sort Palópolo, Evangelina E.
title A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
title_short A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
title_full A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
title_fullStr A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
title_full_unstemmed A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
title_sort new zoroasterid asteroid from the eocene of seymour island, antarctica
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/142781
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bdutipo_str Repositorios
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