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A new specimen of Uruguaysuchus aznarezi (Crocodyliformes: Notosuchia) from the middle Cretaceous of Uruguay and its phylogenetic relationships

Identifieur interne : 004A09 ( Main/Exploration ); précédent : 004A08; suivant : 004A10

A new specimen of Uruguaysuchus aznarezi (Crocodyliformes: Notosuchia) from the middle Cretaceous of Uruguay and its phylogenetic relationships

Auteurs : Matías Soto [Uruguay] ; Diego Pol [Argentine] ; Daniel Perea [Uruguay]

Source :

RBID : ISTEX:04AFFCCB22827AF29706710E3A3DDB5A3785CC67

Descripteurs français

English descriptors

Abstract

Uruguaysuchus is a small mesoeucrocodylian known from several partial skeletons and skulls from the Guichón Formation (middle Cretaceous, Uruguay). Several authors have pointed out derived similarities of this taxon with different basal notosuchian genera, highlighting its importance for mesoeucrocodylian phylogeny and biogeography. However, the holotype is only partially prepared and has not been available for study for many years. Thus, phylogenetic studies have included this form based on the original description, thereby resulting in a large amount of missing data in the character scorings of this taxon. Here, we describe a new specimen from the type locality consisting of a partial skull, lower jaw and cervical vertebrae which can be referred to U. aznarezi. The new specimen allows for the recognition and scoring of several characters previously unknown for this taxon, thus providing a more extensive diagnosis, as well as new information for understanding its phylogenetic relationships. These characters are congruent with the morphology present in basal notosuchians. The relationships of Uruguaysuchus are tested through a cladistic analysis using a recently published data set including the new information. The phylogenetic results differ from previous analyses, recovering this taxon as the sister group of the Araripesuchus clade. U. terrai is considered a juvenile individual of U. aznarezi.

Url:
DOI: 10.1111/j.1096-3642.2011.00717.x


Affiliations:


Links toward previous steps (curation, corpus...)


Le document en format XML

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<term>Anges</term>
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<term>Lateral margins</term>
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<term>Soto</term>
<term>Sphagesaurus</term>
<term>Splenial</term>
<term>Splenials</term>
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<term>Anterior half</term>
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<term>Crocodyliformes</term>
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<term>Denticle</term>
<term>Dentition</term>
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<term>Dorsal margin</term>
<term>Dorsal surface</term>
<term>Dorsal view</term>
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<term>Dorsoventrally</term>
<term>Ectopterygoid</term>
<term>External mandibular fenestra</term>
<term>Facet</term>
<term>Fenestra</term>
<term>Foramen</term>
<term>Fossa</term>
<term>Gasparini</term>
<term>Glenoid</term>
<term>Glenoid facet</term>
<term>Gomani</term>
<term>Gomesii</term>
<term>Goso</term>
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<term>Groove</term>
<term>Holotype</term>
<term>Incisiviform</term>
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<term>Lateral view</term>
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<term>Libycosuchus</term>
<term>Lingual</term>
<term>Linnean</term>
<term>Linnean society</term>
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<term>Malawisuchus</term>
<term>Mandibular</term>
<term>Mandibular ramus</term>
<term>Mandibular symphysis</term>
<term>Margin</term>
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<term>Maxilla</term>
<term>Maxillary</term>
<term>Medial</term>
<term>Mesial</term>
<term>Mesoeucrocodylia</term>
<term>Mesoeucrocodylians</term>
<term>Middle cretaceous</term>
<term>Montevideo</term>
<term>Morphology</term>
<term>Notosuchia</term>
<term>Notosuchian</term>
<term>Notosuchian crocodyliforms</term>
<term>Notosuchians</term>
<term>Notosuchians notosuchus</term>
<term>Notosuchus</term>
<term>Ornamentation</term>
<term>Otic</term>
<term>Otic aperture</term>
<term>Palatal</term>
<term>Palatal branches</term>
<term>Palatine</term>
<term>Paleontology</term>
<term>Patagonia</term>
<term>Patagonicus</term>
<term>Paysand</term>
<term>Perea</term>
<term>Phylogenetic</term>
<term>Phylogenetic analysis</term>
<term>Phylogenetic relationships</term>
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<term>Posterior half</term>
<term>Posterior margin</term>
<term>Posterior process</term>
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<term>Posteriorly</term>
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<term>Premaxillary alveoli</term>
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<term>Quadrate</term>
<term>Ramus</term>
<term>Retroarticular</term>
<term>Retroarticular process</term>
<term>Rusconi</term>
<term>Septum</term>
<term>Simosuchus</term>
<term>Skull</term>
<term>Soto</term>
<term>Sphagesaurus</term>
<term>Splenial</term>
<term>Splenials</term>
<term>Suborbital</term>
<term>Suborbital fenestra</term>
<term>Surangular</term>
<term>Suture</term>
<term>Sutured</term>
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<term>Symphysis</term>
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<term>Terrai</term>
<term>Tooth count</term>
<term>Toothrow</term>
<term>Tsangatsangana</term>
<term>Turner buckley</term>
<term>Unambiguous synapomorphies</term>
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<term>Uruguaysuchus</term>
<term>Uruguaysuchus aznarezi</term>
<term>Ventral</term>
<term>Ventral margin</term>
<term>Ventral surface</term>
<term>Ventral view</term>
<term>Ventrally</term>
<term>Veroslavsky</term>
<term>Vertebra</term>
<term>Vertebrate paleontology</term>
<term>Zoological</term>
<term>Zoological journal</term>
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<front>
<div type="abstract">Uruguaysuchus is a small mesoeucrocodylian known from several partial skeletons and skulls from the Guichón Formation (middle Cretaceous, Uruguay). Several authors have pointed out derived similarities of this taxon with different basal notosuchian genera, highlighting its importance for mesoeucrocodylian phylogeny and biogeography. However, the holotype is only partially prepared and has not been available for study for many years. Thus, phylogenetic studies have included this form based on the original description, thereby resulting in a large amount of missing data in the character scorings of this taxon. Here, we describe a new specimen from the type locality consisting of a partial skull, lower jaw and cervical vertebrae which can be referred to U. aznarezi. The new specimen allows for the recognition and scoring of several characters previously unknown for this taxon, thus providing a more extensive diagnosis, as well as new information for understanding its phylogenetic relationships. These characters are congruent with the morphology present in basal notosuchians. The relationships of Uruguaysuchus are tested through a cladistic analysis using a recently published data set including the new information. The phylogenetic results differ from previous analyses, recovering this taxon as the sister group of the Araripesuchus clade. U. terrai is considered a juvenile individual of U. aznarezi.</div>
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