cover image: Eocene caviomorph rodents from Balsayacu (Peruvian Amazonia)

20.500.12592/40uz0kz

Eocene caviomorph rodents from Balsayacu (Peruvian Amazonia)

30 Mar 2022

The Paleogene record of caviomorph rodents has substantially increased over the last decades, and their evolutionary history better understood by the discovery of their earliest representatives, so far recorded in several pre-Deseadan localities in Peruvian Amazonia. We report here the discovery of new caviomorph fossils from the Balsayacu area in Peru (TAR-55/TAR-55bis, TAR-76 and TAR-77 localities, San Martín Department). The study of this new material reveals the occurrence of four caviomorph taxa in these localities: Balsayacuy huallagaensis gen. et sp. nov., Chachapoyamys kathetos gen. et sp. nov. and Caviomorpha gen. et sp. indet. 1 and 2. It allows the revision and refinement of taxonomic assignments of previously described specimens. The first three taxa have a primitive dental pattern, as that characterizing stem Caviomorpha recorded in pre-Deseadan localities of Peru (Eocene localities of Contamana and ?late Eocene/early Oligocene Santa Rosa). We support here an Eocene age for the Balsayacu section due to the complete absence of morphologically derived taxa representing modern caviomorph superfamilies. By the presence of derived characters in Balsayacuy and Chachapoyamys compared to Canaanimys maquiensis and Cachiyacuy contamanensis from CTA-27 (Contamana, Peru; late middle Eocene), the Balsayacu section may document a time interval slightly younger than CTA-27 (which further yields Chachapoyamys cf. kathetos) and older than those of Santa Rosa and Tarapoto-Shapaja, likely documenting latest middle or early late Eocene times. These low-latitude stem caviomorph faunas provide new insights into the early evolutionary history and paleodiversity of that group immediately before the rise of modern superfamilies.

Authors

Myriam Boivin, Laurent Marivaux, Walter Aguirre-Diaz, Michele Andriolli Custódio, Aldo Benites-Palomino, François Pujos, Martin Roddaz, Rodolfo Salas-Gismondi, Narla Stutz, Julia Tejada-Lara, Johan Yans, Pierre-Olivier Antoine

Bibliographic Reference
Myriam Boivin, Laurent Marivaux, Walter Aguirre-Diaz, Michele Andriolli Custódio, Aldo Benites-Palomino, et al.. Eocene caviomorph rodents from Balsayacu (Peruvian Amazonia). Paläontologische Zeitschrift, 2022, 96 (1), pp.135-160. ⟨10.1007/s12542-021-00551-0⟩. ⟨hal-03248990⟩
DOI
https://doi.org/10.1007/s12542-021-00551-0
Funding
['The Leakey FoundationNational Geographic Society', 'LabEx CEBA']
HAL Collection
['IRD - Institut de recherche pour le développement', 'CIRAD - Centre de coopération internationale en recherche agronomique pour le développement', "INSU - Institut National des Sciences de l'Univers", 'Météo France', 'École Pratique des Hautes Études', 'Université Paul Sabatier - Toulouse III', 'CNRS - Centre national de la recherche scientifique', "CNES - Centre national d'études spatiales", 'Observatoire Midi-Pyrénées', 'Laboratoire des Mécanismes et Transfert en Géologie', 'GET : Geosciences -Environnement- Toulouse', "Institut des Sciences de l'Evolution", 'Université de Montpellier', 'GIP Bretagne Environnement', 'Université Paris sciences et lettres', 'Archive ouverte en agrobiosciences', 'TEST-DEV', 'Collection test HAL CNRS', 'École pratique des hautes études - PSL', 'ANR', 'Université Toulouse 3', 'Université Toulouse III / Toulouse INP', 'Université de Montpellier (2015-2021)', 'Université de Montpellier - EPE', 'TEST3-HALCNRS', 'collection test', 'collection test 5', 'Institut écologie et environnement du CNRS']
HAL Identifier
3249167
Institution
['Universidad Nacional de Jujuy', 'Centre de Coopération Internationale en Recherche Agronomique pour le Développement', 'École Pratique des Hautes Études', 'Institut de recherche pour le développement [IRD] : UR226', 'Universidad Nacional Mayor de San Marcos', 'Universidade Federal do Amazonas', 'Universität Zürich [Zürich] = University of Zurich', 'Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires]', 'Universidad Nacional de Cuyo [Mendoza]', 'Institut de Recherche pour le Développement', 'Université Toulouse III - Paul Sabatier', "Institut national des sciences de l'Univers", "Centre National d'Études Spatiales [Toulouse]", 'Météo-France', 'Universidade de Brasilia [Brasília]', 'Universidad Peruana Cayetano Heredia', 'Universidade Federal do Rio Grande do Sul [Porto Alegre]', 'Université de Namur [Namur]']
Laboratory
["Institut des Sciences de l'Evolution de Montpellier", 'Museo de Historia Natural de Lima', 'Paläontologisches Institut und Museum', 'Géosciences Environnement Toulouse', 'Instituto de Geociências', 'Institute of Life, Earth and Environment']
Published in
France

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