Recent discovery of an argyrolagid (Mammalia, Metatheria) for the Marplatan stage (middle Pliocene-early Pleistocene) of northwestern Argentina

Autores
Babot, Judith; García López, D. A.; Ortíz, P. E.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
We present the first remains of an argyrolagid from the Uquía Formation (middle Pliocene-early Pleistocene; Marplatan) recovered at San Roque, Humahuaca, Jujuy Province, Argentina. The material is part of a microvertebrate fossil assemblage generated by trophic activity of predator birds that also includes amphibians, lizards, birds, rodents and didelphids. The remains represent three individuals and include fragments of maxilla and dentaries, and postcranial fragmentary bones (humeri, astragali, calcanei, and ungueal phalanges). The upper teeth show a simplified occlusal morphology, typical of this family. The most conspicuous features of lower teeth are: the presence of procumbent incisors, a mesiolabial expansion defining a shallow groove on m1, deep lingual groove absent on m1 and m2 but present on m3 and m4, m4 reduced with a deep labial groove and a shallow distal concavity. The morphology of lower molars (particularly, on m4 the deep labial groove and the distal shallow concavity) allows us to refer the material to Microtragulus bolivianus Hoffstetter and Villarroel. This species differs from other species of Microtragulus by: the absence of lingual groove on m1, labial groove of mesial lobe on m2, and lingual groove on m2, and the presence of larger m4 with a labial groove (M. reigi Simpson); its larger size, the deepest labial groove, and the presence of lingual groove on m3 and labial groove on m4 (M. catamarcensis [Kraglievich]); and by the absence of lingual groove on m1 and the presence of deeper labial grooves (M. rusconii Goin, Montalvo and Visconti). Rodents recorded in this assemblage (Microcavia, octodontids) are nowadays typical dwellers of dry and open areas, suggesting similar paleoenvironmental conditions for these levels of the Uquía Formation. The presence of Microtragulus bolivianus in western Bolivia and northwestern Argentina suggests that a continuous area of xeric conditions was already established in this region by the end of the Pliocene.
Sesiones libres
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Argyrolagid (Mammalia, Metatheria)
Marplatan stage (middle Pliocene-early Pleistocene)
Argentina
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/16812

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network_name_str SEDICI (UNLP)
spelling Recent discovery of an argyrolagid (Mammalia, Metatheria) for the Marplatan stage (middle Pliocene-early Pleistocene) of northwestern ArgentinaBabot, JudithGarcía López, D. A.Ortíz, P. E.Ciencias NaturalesPaleontologíaArgyrolagid (Mammalia, Metatheria)Marplatan stage (middle Pliocene-early Pleistocene)ArgentinaWe present the first remains of an argyrolagid from the Uquía Formation (middle Pliocene-early Pleistocene; Marplatan) recovered at San Roque, Humahuaca, Jujuy Province, Argentina. The material is part of a microvertebrate fossil assemblage generated by trophic activity of predator birds that also includes amphibians, lizards, birds, rodents and didelphids. The remains represent three individuals and include fragments of maxilla and dentaries, and postcranial fragmentary bones (humeri, astragali, calcanei, and ungueal phalanges). The upper teeth show a simplified occlusal morphology, typical of this family. The most conspicuous features of lower teeth are: the presence of procumbent incisors, a mesiolabial expansion defining a shallow groove on m1, deep lingual groove absent on m1 and m2 but present on m3 and m4, m4 reduced with a deep labial groove and a shallow distal concavity. The morphology of lower molars (particularly, on m4 the deep labial groove and the distal shallow concavity) allows us to refer the material to Microtragulus bolivianus Hoffstetter and Villarroel. This species differs from other species of Microtragulus by: the absence of lingual groove on m1, labial groove of mesial lobe on m2, and lingual groove on m2, and the presence of larger m4 with a labial groove (M. reigi Simpson); its larger size, the deepest labial groove, and the presence of lingual groove on m3 and labial groove on m4 (M. catamarcensis [Kraglievich]); and by the absence of lingual groove on m1 and the presence of deeper labial grooves (M. rusconii Goin, Montalvo and Visconti). Rodents recorded in this assemblage (Microcavia, octodontids) are nowadays typical dwellers of dry and open areas, suggesting similar paleoenvironmental conditions for these levels of the Uquía Formation. The presence of Microtragulus bolivianus in western Bolivia and northwestern Argentina suggests that a continuous area of xeric conditions was already established in this region by the end of the Pliocene.Sesiones libresFacultad de Ciencias Naturales y Museo2010info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/16812enginfo:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2info:eu-repo/semantics/reference/hdl/10915/25738info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T10:53:02Zoai:sedici.unlp.edu.ar:10915/16812Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 10:53:03.147SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Recent discovery of an argyrolagid (Mammalia, Metatheria) for the Marplatan stage (middle Pliocene-early Pleistocene) of northwestern Argentina
title Recent discovery of an argyrolagid (Mammalia, Metatheria) for the Marplatan stage (middle Pliocene-early Pleistocene) of northwestern Argentina
spellingShingle Recent discovery of an argyrolagid (Mammalia, Metatheria) for the Marplatan stage (middle Pliocene-early Pleistocene) of northwestern Argentina
Babot, Judith
Ciencias Naturales
Paleontología
Argyrolagid (Mammalia, Metatheria)
Marplatan stage (middle Pliocene-early Pleistocene)
Argentina
title_short Recent discovery of an argyrolagid (Mammalia, Metatheria) for the Marplatan stage (middle Pliocene-early Pleistocene) of northwestern Argentina
title_full Recent discovery of an argyrolagid (Mammalia, Metatheria) for the Marplatan stage (middle Pliocene-early Pleistocene) of northwestern Argentina
title_fullStr Recent discovery of an argyrolagid (Mammalia, Metatheria) for the Marplatan stage (middle Pliocene-early Pleistocene) of northwestern Argentina
title_full_unstemmed Recent discovery of an argyrolagid (Mammalia, Metatheria) for the Marplatan stage (middle Pliocene-early Pleistocene) of northwestern Argentina
title_sort Recent discovery of an argyrolagid (Mammalia, Metatheria) for the Marplatan stage (middle Pliocene-early Pleistocene) of northwestern Argentina
dc.creator.none.fl_str_mv Babot, Judith
García López, D. A.
Ortíz, P. E.
author Babot, Judith
author_facet Babot, Judith
García López, D. A.
Ortíz, P. E.
author_role author
author2 García López, D. A.
Ortíz, P. E.
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
Argyrolagid (Mammalia, Metatheria)
Marplatan stage (middle Pliocene-early Pleistocene)
Argentina
topic Ciencias Naturales
Paleontología
Argyrolagid (Mammalia, Metatheria)
Marplatan stage (middle Pliocene-early Pleistocene)
Argentina
dc.description.none.fl_txt_mv We present the first remains of an argyrolagid from the Uquía Formation (middle Pliocene-early Pleistocene; Marplatan) recovered at San Roque, Humahuaca, Jujuy Province, Argentina. The material is part of a microvertebrate fossil assemblage generated by trophic activity of predator birds that also includes amphibians, lizards, birds, rodents and didelphids. The remains represent three individuals and include fragments of maxilla and dentaries, and postcranial fragmentary bones (humeri, astragali, calcanei, and ungueal phalanges). The upper teeth show a simplified occlusal morphology, typical of this family. The most conspicuous features of lower teeth are: the presence of procumbent incisors, a mesiolabial expansion defining a shallow groove on m1, deep lingual groove absent on m1 and m2 but present on m3 and m4, m4 reduced with a deep labial groove and a shallow distal concavity. The morphology of lower molars (particularly, on m4 the deep labial groove and the distal shallow concavity) allows us to refer the material to Microtragulus bolivianus Hoffstetter and Villarroel. This species differs from other species of Microtragulus by: the absence of lingual groove on m1, labial groove of mesial lobe on m2, and lingual groove on m2, and the presence of larger m4 with a labial groove (M. reigi Simpson); its larger size, the deepest labial groove, and the presence of lingual groove on m3 and labial groove on m4 (M. catamarcensis [Kraglievich]); and by the absence of lingual groove on m1 and the presence of deeper labial grooves (M. rusconii Goin, Montalvo and Visconti). Rodents recorded in this assemblage (Microcavia, octodontids) are nowadays typical dwellers of dry and open areas, suggesting similar paleoenvironmental conditions for these levels of the Uquía Formation. The presence of Microtragulus bolivianus in western Bolivia and northwestern Argentina suggests that a continuous area of xeric conditions was already established in this region by the end of the Pliocene.
Sesiones libres
Facultad de Ciencias Naturales y Museo
description We present the first remains of an argyrolagid from the Uquía Formation (middle Pliocene-early Pleistocene; Marplatan) recovered at San Roque, Humahuaca, Jujuy Province, Argentina. The material is part of a microvertebrate fossil assemblage generated by trophic activity of predator birds that also includes amphibians, lizards, birds, rodents and didelphids. The remains represent three individuals and include fragments of maxilla and dentaries, and postcranial fragmentary bones (humeri, astragali, calcanei, and ungueal phalanges). The upper teeth show a simplified occlusal morphology, typical of this family. The most conspicuous features of lower teeth are: the presence of procumbent incisors, a mesiolabial expansion defining a shallow groove on m1, deep lingual groove absent on m1 and m2 but present on m3 and m4, m4 reduced with a deep labial groove and a shallow distal concavity. The morphology of lower molars (particularly, on m4 the deep labial groove and the distal shallow concavity) allows us to refer the material to Microtragulus bolivianus Hoffstetter and Villarroel. This species differs from other species of Microtragulus by: the absence of lingual groove on m1, labial groove of mesial lobe on m2, and lingual groove on m2, and the presence of larger m4 with a labial groove (M. reigi Simpson); its larger size, the deepest labial groove, and the presence of lingual groove on m3 and labial groove on m4 (M. catamarcensis [Kraglievich]); and by the absence of lingual groove on m1 and the presence of deeper labial grooves (M. rusconii Goin, Montalvo and Visconti). Rodents recorded in this assemblage (Microcavia, octodontids) are nowadays typical dwellers of dry and open areas, suggesting similar paleoenvironmental conditions for these levels of the Uquía Formation. The presence of Microtragulus bolivianus in western Bolivia and northwestern Argentina suggests that a continuous area of xeric conditions was already established in this region by the end of the Pliocene.
publishDate 2010
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