The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction

ABSTRACT The Middle-Upper Ordovician Ponón Trehué Formation cropping out in the San Rafael Block (Argentina) provided a large collection of conodonts which have been published years ago. The species Eoplacognathus robustus and Eoplacognathus lindstroemi recovered from these strata have been revised...

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Autores principales:	Heredia,Susana, Mestre,Ana
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2019
Materias:	Cuyania Ordovician Eoplacognathus Taxonomy
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062019000300556
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spelling	oai:scielo:S0718-710620190003005562019-10-21The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstructionHeredia,SusanaMestre,Ana Cuyania Ordovician Eoplacognathus Taxonomy ABSTRACT The Middle-Upper Ordovician Ponón Trehué Formation cropping out in the San Rafael Block (Argentina) provided a large collection of conodonts which have been published years ago. The species Eoplacognathus robustus and Eoplacognathus lindstroemi recovered from these strata have been revised and restudied. In this contribution we describe M and S elements that were assigned previously to Baltoniodus prevariabilis and Baltoniodus variabilis as belonging to the E. robustus and E. lindstroemi apparatuses. The morphological characters of the P, S and M elements as part of these late Eoplacognathus apparatus were analyzed and support the proposal of a new reconstruction of it. We have compared this apparatus with the Baltoniodus apparatus and suggest the inclusion of the Eoplacognathus genus into the Balognathidae family. The new architecture of the Eoplacognathus apparatus is comparable to the genus Lenodus. This analysis improves the knowledge about this index conodont group allowing a new insight on the evolution, phylogeny and paleobiology of this linage.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.46 n.3 20192019-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062019000300556en10.5027/andgeov46n3-3189
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Cuyania Ordovician Eoplacognathus Taxonomy
spellingShingle	Cuyania Ordovician Eoplacognathus Taxonomy Heredia,Susana Mestre,Ana The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction
description	ABSTRACT The Middle-Upper Ordovician Ponón Trehué Formation cropping out in the San Rafael Block (Argentina) provided a large collection of conodonts which have been published years ago. The species Eoplacognathus robustus and Eoplacognathus lindstroemi recovered from these strata have been revised and restudied. In this contribution we describe M and S elements that were assigned previously to Baltoniodus prevariabilis and Baltoniodus variabilis as belonging to the E. robustus and E. lindstroemi apparatuses. The morphological characters of the P, S and M elements as part of these late Eoplacognathus apparatus were analyzed and support the proposal of a new reconstruction of it. We have compared this apparatus with the Baltoniodus apparatus and suggest the inclusion of the Eoplacognathus genus into the Balognathidae family. The new architecture of the Eoplacognathus apparatus is comparable to the genus Lenodus. This analysis improves the knowledge about this index conodont group allowing a new insight on the evolution, phylogeny and paleobiology of this linage.
author	Heredia,Susana Mestre,Ana
author_facet	Heredia,Susana Mestre,Ana
author_sort	Heredia,Susana
title	The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction
title_short	The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction
title_full	The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction
title_fullStr	The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction
title_full_unstemmed	The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction
title_sort	middle ordovician conodonts eoplacognathus robustus bergström and e. lindstroemi (hamar): taxonomy and apparatus reconstruction
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2019
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062019000300556
work_keys_str_mv	AT herediasusana themiddleordovicianconodontseoplacognathusrobustusbergstromandelindstroemihamartaxonomyandapparatusreconstruction AT mestreana themiddleordovicianconodontseoplacognathusrobustusbergstromandelindstroemihamartaxonomyandapparatusreconstruction AT herediasusana middleordovicianconodontseoplacognathusrobustusbergstromandelindstroemihamartaxonomyandapparatusreconstruction AT mestreana middleordovicianconodontseoplacognathusrobustusbergstromandelindstroemihamartaxonomyandapparatusreconstruction
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The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction

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