Brittle stars from the Lower Cretaceous of Patagonia: first ophiuroid articulated remains for the Mesozoic of South America

ABSTRACT The first articulated remains of ophiuroids for the Mesozoic of South America are described from the Lower Cretaceous of Neuquén Basin, Argentina. The taxonomic analysis allows the assignment of the material described herein to the extinct genus Ophiopetra. The specimens belong to a new spe...

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Autores principales:	Fernández,Diana E., Giachetti,Luciana, Stöhr,Sabine, Thuy,Ben, Pérez,Damián E., Comerio,Marcos, Pazos,Pablo J.
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2019
Materias:	Ophiuroidea Early Cretaceous Southern Hemisphere Ophiopetra Ophionereididae
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062019000200421
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spelling	oai:scielo:S0718-710620190002004212019-08-02Brittle stars from the Lower Cretaceous of Patagonia: first ophiuroid articulated remains for the Mesozoic of South AmericaFernández,Diana E.Giachetti,LucianaStöhr,SabineThuy,BenPérez,Damián E.Comerio,MarcosPazos,Pablo J. Ophiuroidea Early Cretaceous Southern Hemisphere Ophiopetra Ophionereididae ABSTRACT The first articulated remains of ophiuroids for the Mesozoic of South America are described from the Lower Cretaceous of Neuquén Basin, Argentina. The taxonomic analysis allows the assignment of the material described herein to the extinct genus Ophiopetra. The specimens belong to a new species, but considering the poor preservation, a new name is not introduced, as it would be based on an incomplete diagnosis. Certain characteristics (e.g., the diameter of the disc, the width/height ratio of the vertebrae) suggest that these ophiuroids are paedomorphic specimens. In light of the latest classification of the Ophiuroidea, and new insights on the spine articulation microstructure of Ophiopetra lithographica presented herein, a transfer of Ophiopetra to the family Ophionereididae within the order Amphilepidida is proposed. This material expands the palaeogeographic record of this genus, since it represents the first remains of Ophiopetra described in the Southern Hemisphere. It is also the first Cretaceous record of the genus worldwide.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.46 n.2 20192019-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062019000200421en10.5027/andgeov46n2-3157
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Ophiuroidea Early Cretaceous Southern Hemisphere Ophiopetra Ophionereididae
spellingShingle	Ophiuroidea Early Cretaceous Southern Hemisphere Ophiopetra Ophionereididae Fernández,Diana E. Giachetti,Luciana Stöhr,Sabine Thuy,Ben Pérez,Damián E. Comerio,Marcos Pazos,Pablo J. Brittle stars from the Lower Cretaceous of Patagonia: first ophiuroid articulated remains for the Mesozoic of South America
description	ABSTRACT The first articulated remains of ophiuroids for the Mesozoic of South America are described from the Lower Cretaceous of Neuquén Basin, Argentina. The taxonomic analysis allows the assignment of the material described herein to the extinct genus Ophiopetra. The specimens belong to a new species, but considering the poor preservation, a new name is not introduced, as it would be based on an incomplete diagnosis. Certain characteristics (e.g., the diameter of the disc, the width/height ratio of the vertebrae) suggest that these ophiuroids are paedomorphic specimens. In light of the latest classification of the Ophiuroidea, and new insights on the spine articulation microstructure of Ophiopetra lithographica presented herein, a transfer of Ophiopetra to the family Ophionereididae within the order Amphilepidida is proposed. This material expands the palaeogeographic record of this genus, since it represents the first remains of Ophiopetra described in the Southern Hemisphere. It is also the first Cretaceous record of the genus worldwide.
author	Fernández,Diana E. Giachetti,Luciana Stöhr,Sabine Thuy,Ben Pérez,Damián E. Comerio,Marcos Pazos,Pablo J.
author_facet	Fernández,Diana E. Giachetti,Luciana Stöhr,Sabine Thuy,Ben Pérez,Damián E. Comerio,Marcos Pazos,Pablo J.
author_sort	Fernández,Diana E.
title	Brittle stars from the Lower Cretaceous of Patagonia: first ophiuroid articulated remains for the Mesozoic of South America
title_short	Brittle stars from the Lower Cretaceous of Patagonia: first ophiuroid articulated remains for the Mesozoic of South America
title_full	Brittle stars from the Lower Cretaceous of Patagonia: first ophiuroid articulated remains for the Mesozoic of South America
title_fullStr	Brittle stars from the Lower Cretaceous of Patagonia: first ophiuroid articulated remains for the Mesozoic of South America
title_full_unstemmed	Brittle stars from the Lower Cretaceous of Patagonia: first ophiuroid articulated remains for the Mesozoic of South America
title_sort	brittle stars from the lower cretaceous of patagonia: first ophiuroid articulated remains for the mesozoic of south america
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2019
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062019000200421
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Brittle stars from the Lower Cretaceous of Patagonia: first ophiuroid articulated remains for the Mesozoic of South America

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