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Osteology of Pseudochampsa ischigualastensis gen. et comb. nov. (Archosauriformes: Proterochampsidae) from the early late triassic ischigualasto formation of Northwestern Argentina.
PLoS One. 2014; 9(11):e111388.Plos

Abstract

Proterochampsids are crocodile-like, probably semi-aquatic, quadrupedal archosauriforms characterized by an elongated and dorsoventrally low skull. The group is endemic from the Middle-Late Triassic of South America. The most recently erected proterochampsid species is "Chanaresuchus ischigualastensis", based on a single, fairly complete skeleton from the early Late Triassic Ischigualasto Formation of northwestern Argentina. We describe here in detail the non-braincase cranial and postcranial anatomy of this species and revisit its taxonomy and phylogenetic relationships. The phylogenetic analysis recovered 'Chanaresuchus ischigualastensis' as part of a trichotomy together with Gualosuchus reigi and Chanaresuchus bonapartei. Accordingly, "Chanaresuchus ischigualastensis" can be potentially more closely related to Gualosuchus reigi, or even Rhadinosuchus gracilis, than to Chanaresuchus bonapartei. In addition, after discussing previously claimed synapomorphies of Chanaresuchus, we could not find unambiguous support for the monophyly of the genus. As a result, we propose here the erection of the new genus Pseudochampsa for 'Chanaresuchus ischigualastensis', which results in the new combination Pseudochampsa ischigualastensis. The information provided here about the anatomy and taxonomy of Pseudochampsa ischiguaslastensis will be useful for future quantitative analyses focused on the biogeography and macroevolutionary history of proterochampsids.

Authors+Show Affiliations

CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina; INGEO, Instituto de Geología, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, San Juan, San Juan, Argentina.School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, West Midlands, United Kingdom.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25426846

Citation

Trotteyn, M Jimena, and Martín D. Ezcurra. "Osteology of Pseudochampsa Ischigualastensis Gen. Et Comb. Nov. (Archosauriformes: Proterochampsidae) From the Early Late Triassic Ischigualasto Formation of Northwestern Argentina." PloS One, vol. 9, no. 11, 2014, pp. e111388.
Trotteyn MJ, Ezcurra MD. Osteology of Pseudochampsa ischigualastensis gen. et comb. nov. (Archosauriformes: Proterochampsidae) from the early late triassic ischigualasto formation of Northwestern Argentina. PLoS One. 2014;9(11):e111388.
Trotteyn, M. J., & Ezcurra, M. D. (2014). Osteology of Pseudochampsa ischigualastensis gen. et comb. nov. (Archosauriformes: Proterochampsidae) from the early late triassic ischigualasto formation of Northwestern Argentina. PloS One, 9(11), e111388. https://doi.org/10.1371/journal.pone.0111388
Trotteyn MJ, Ezcurra MD. Osteology of Pseudochampsa Ischigualastensis Gen. Et Comb. Nov. (Archosauriformes: Proterochampsidae) From the Early Late Triassic Ischigualasto Formation of Northwestern Argentina. PLoS One. 2014;9(11):e111388. PubMed PMID: 25426846.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Osteology of Pseudochampsa ischigualastensis gen. et comb. nov. (Archosauriformes: Proterochampsidae) from the early late triassic ischigualasto formation of Northwestern Argentina. AU - Trotteyn,M Jimena, AU - Ezcurra,Martín D, Y1 - 2014/11/26/ PY - 2013/06/26/received PY - 2014/10/02/accepted PY - 2014/11/27/entrez PY - 2014/11/27/pubmed PY - 2015/7/15/medline SP - e111388 EP - e111388 JF - PloS one JO - PLoS One VL - 9 IS - 11 N2 - Proterochampsids are crocodile-like, probably semi-aquatic, quadrupedal archosauriforms characterized by an elongated and dorsoventrally low skull. The group is endemic from the Middle-Late Triassic of South America. The most recently erected proterochampsid species is "Chanaresuchus ischigualastensis", based on a single, fairly complete skeleton from the early Late Triassic Ischigualasto Formation of northwestern Argentina. We describe here in detail the non-braincase cranial and postcranial anatomy of this species and revisit its taxonomy and phylogenetic relationships. The phylogenetic analysis recovered 'Chanaresuchus ischigualastensis' as part of a trichotomy together with Gualosuchus reigi and Chanaresuchus bonapartei. Accordingly, "Chanaresuchus ischigualastensis" can be potentially more closely related to Gualosuchus reigi, or even Rhadinosuchus gracilis, than to Chanaresuchus bonapartei. In addition, after discussing previously claimed synapomorphies of Chanaresuchus, we could not find unambiguous support for the monophyly of the genus. As a result, we propose here the erection of the new genus Pseudochampsa for 'Chanaresuchus ischigualastensis', which results in the new combination Pseudochampsa ischigualastensis. The information provided here about the anatomy and taxonomy of Pseudochampsa ischiguaslastensis will be useful for future quantitative analyses focused on the biogeography and macroevolutionary history of proterochampsids. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/25426846/Osteology_of_Pseudochampsa_ischigualastensis_gen__et_comb__nov___Archosauriformes:_Proterochampsidae__from_the_early_late_triassic_ischigualasto_formation_of_Northwestern_Argentina_ DB - PRIME DP - Unbound Medicine ER -