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First record of Toxodontidae (Mammalia, Notoungulata) from the late Miocene-early Pliocene of the southern Central Andes, NW Argentina

Ricardo A. Bonini, Gabriela I. Schmidt, Marcelo A. Reguero, Esperanza Cerdeno, Adriana M. Candela and Natalia Solis
First record of Toxodontidae (Mammalia, Notoungulata) from the late Miocene-early Pliocene of the southern Central Andes, NW Argentina
Journal of Paleontology (May 2017) 91 (3): 566-576

Abstract

A new species of toxodontid notoungulate, Xotodon maimarensis n. sp., is described from the Maimara Formation (late Miocene-early Pliocene), Jujuy Province, northwestern Argentina. This is the first record of a toxodontid from the Eastern Cordillera. The specimen is housed at the Museo de Geologia, Mineralogia y Paleontologia, Instituto de Geologia y Mineria de la Universidad Nacional de Jujuy. It consists of an incomplete mandible preserving the right mandibular ramus with part of the dental series, partially preserved symphysis with all the incisors, and a small portion of the left ramus without teeth. The following characters distinguish it as a new taxon: symphysis long and narrow with slight divergence of its lateral borders; strong procumbence of lower incisors and deeply implanted i3; chin angle lower than in X major and X cristatus and bulging labial keel limiting strong lateral concavities. Comparative analysis in the context of the recently revised Neogene Toxodontidae indicates that the Maimara specimen shares mandibular features and dental characters with Xotodon and Mixotoxodon, differing from the latter by the more upraised symphysis. The phylogenetic position of Xotodon maimarensis n. sp. supports the taxonomic interpretation of the studied specimen as a new species of Xotodon. This new Toxodontidae increases the knowledge of the diversity and radiation of this group of notoungulates in northwest Argentina.


ISSN: 0022-3360
EISSN: 1937-2337
Coden: JPALAZ
Serial Title: Journal of Paleontology
Serial Volume: 91
Serial Issue: 3
Title: First record of Toxodontidae (Mammalia, Notoungulata) from the late Miocene-early Pliocene of the southern Central Andes, NW Argentina
Affiliation: Universidad Nacional de La Plata, Division Paleontologia de Vertebrados, La Plata, Argentina
Pages: 566-576
Published: 201705
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 56
Accession Number: 2017-080386
Categories: Vertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 2 tables, sketch map
S23°37'00" - S23°37'00", W65°24'00" - W65°24'00"
Secondary Affiliation: Centro de Investigaciones Cientificas y Transferencia de Tecnologia a la Produccion, ARG, ArgentinaInstituto Argentino de Nivologia, Glaciologia y Ciencias Ambientales, ARG, ArgentinaUniversidad Nacional de Jujuy, ARG, Argentina
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, The Paleontological Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201742
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