Redescription and reevaluation of the taxonomical status of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Upper Cretaceous of Neuquén, Argentina

Fragmentary remains of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Bajo de La Carpa Formation (Santonian, Late Creteceous) of northern Patagonia, Argentina, are decribed and reevaluated taxonomically. The type specimen is an articulated individual with hindlimb and axial remai...

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Autor principal: Leardi, Juan Martin
Publicado: 2015
Materias:
Crocodyliformes
Mesoeucrocodylia
Neuquén basin
Upper Cretaceous
Cretaceous
fauna
fossil record
genetic analysis
phylogenetics
reptile
skeletal remains
species occurrence
taxonomy
Argentina
Neuquen
Patagonia
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v52_nPA_p153_Leardi
http://hdl.handle.net/20.500.12110/paper_01956671_v52_nPA_p153_Leardi
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_01956671_v52_nPA_p153_Leardi
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spelling paper:paper_01956671_v52_nPA_p153_Leardi2023-06-08T15:20:18Z Redescription and reevaluation of the taxonomical status of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Upper Cretaceous of Neuquén, Argentina Leardi, Juan Martin Crocodyliformes Mesoeucrocodylia Neuquén basin Upper Cretaceous Cretaceous fauna fossil record genetic analysis phylogenetics reptile skeletal remains species occurrence taxonomy Argentina Neuquen Patagonia Mesoeucrocodylia Fragmentary remains of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Bajo de La Carpa Formation (Santonian, Late Creteceous) of northern Patagonia, Argentina, are decribed and reevaluated taxonomically. The type specimen is an articulated individual with hindlimb and axial remains. Microsuchus has several traits that allow to recognize it as a valid taxon (the presence of bulge lateral to the prezygapophyses of the second sacral vertebra; elongated posterior zeugopodia; proximal caudal centra with triangular cross section). Microsuchus was originally assigned as a goniopholidid based on the platycely of its vertebral centra, a character that is widely distributed among fossil crocodyliforms. A phylogenetical analysis using an expanded data matrix focusing on postcranial data was performed in which Microsuchus and another long-limbed crocodyliform from the same location, Neuquensuchus, were included. Microsuchus is depicted in a politomy as a basal mesoeucrocodylian, with its position as a neosuchian or notosuchian supported by a single synapomorphy on the different most parsimonious trees. Additionaly, Neuquensuchus is well nested among notosuchians, in contrast to previous hypothesis. These findings further increase the crocodyliform diversity of the Bajo de la Carpa Formation and emphasize the relevance of its fauna in studies of the diversification of mesoeucrocodylians and notosuchians. Furthermore, the occurrence of both Microsuchus and Neuquensuchus gives evidence of a basal stock of mesoeucrocodylians with elongated limbs that was not previously reported for northern Patagonia. © 2014 Elsevier Ltd. Fil:Leardi, J.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v52_nPA_p153_Leardi http://hdl.handle.net/20.500.12110/paper_01956671_v52_nPA_p153_Leardi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Crocodyliformes
Mesoeucrocodylia
Neuquén basin
Upper Cretaceous
Cretaceous
fauna
fossil record
genetic analysis
phylogenetics
reptile
skeletal remains
species occurrence
taxonomy
Argentina
Neuquen
Patagonia
Mesoeucrocodylia
spellingShingle Crocodyliformes
Mesoeucrocodylia
Neuquén basin
Upper Cretaceous
Cretaceous
fauna
fossil record
genetic analysis
phylogenetics
reptile
skeletal remains
species occurrence
taxonomy
Argentina
Neuquen
Patagonia
Mesoeucrocodylia
Leardi, Juan Martin
Redescription and reevaluation of the taxonomical status of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Upper Cretaceous of Neuquén, Argentina
topic_facet Crocodyliformes
Mesoeucrocodylia
Neuquén basin
Upper Cretaceous
Cretaceous
fauna
fossil record
genetic analysis
phylogenetics
reptile
skeletal remains
species occurrence
taxonomy
Argentina
Neuquen
Patagonia
Mesoeucrocodylia
description Fragmentary remains of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Bajo de La Carpa Formation (Santonian, Late Creteceous) of northern Patagonia, Argentina, are decribed and reevaluated taxonomically. The type specimen is an articulated individual with hindlimb and axial remains. Microsuchus has several traits that allow to recognize it as a valid taxon (the presence of bulge lateral to the prezygapophyses of the second sacral vertebra; elongated posterior zeugopodia; proximal caudal centra with triangular cross section). Microsuchus was originally assigned as a goniopholidid based on the platycely of its vertebral centra, a character that is widely distributed among fossil crocodyliforms. A phylogenetical analysis using an expanded data matrix focusing on postcranial data was performed in which Microsuchus and another long-limbed crocodyliform from the same location, Neuquensuchus, were included. Microsuchus is depicted in a politomy as a basal mesoeucrocodylian, with its position as a neosuchian or notosuchian supported by a single synapomorphy on the different most parsimonious trees. Additionaly, Neuquensuchus is well nested among notosuchians, in contrast to previous hypothesis. These findings further increase the crocodyliform diversity of the Bajo de la Carpa Formation and emphasize the relevance of its fauna in studies of the diversification of mesoeucrocodylians and notosuchians. Furthermore, the occurrence of both Microsuchus and Neuquensuchus gives evidence of a basal stock of mesoeucrocodylians with elongated limbs that was not previously reported for northern Patagonia. © 2014 Elsevier Ltd.
author Leardi, Juan Martin
author_facet Leardi, Juan Martin
author_sort Leardi, Juan Martin
title Redescription and reevaluation of the taxonomical status of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Upper Cretaceous of Neuquén, Argentina
title_short Redescription and reevaluation of the taxonomical status of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Upper Cretaceous of Neuquén, Argentina
title_full Redescription and reevaluation of the taxonomical status of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Upper Cretaceous of Neuquén, Argentina
title_fullStr Redescription and reevaluation of the taxonomical status of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Upper Cretaceous of Neuquén, Argentina
title_full_unstemmed Redescription and reevaluation of the taxonomical status of Microsuchus schilleri (Crocodyliformes: Mesoeucrocodylia) from the Upper Cretaceous of Neuquén, Argentina
title_sort redescription and reevaluation of the taxonomical status of microsuchus schilleri (crocodyliformes: mesoeucrocodylia) from the upper cretaceous of neuquén, argentina
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v52_nPA_p153_Leardi
http://hdl.handle.net/20.500.12110/paper_01956671_v52_nPA_p153_Leardi
work_keys_str_mv AT leardijuanmartin redescriptionandreevaluationofthetaxonomicalstatusofmicrosuchusschillericrocodyliformesmesoeucrocodyliafromtheuppercretaceousofneuquenargentina
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