Abstract
We review the history of the South American hystricomorph rodent family Ctenomyidae as told by its fossil record and phylogenetic hypotheses. Differing interpretations of the evolutionary significance of extinct taxa have led to disparate accounts of the history of the family. Thus, assessing hypotheses that assign fossils to the different evolutionary stages of the clade is necessary to provide reliable age estimations of origin and extinction of lineages. We discuss the conceptually different definitions of the family and of genus Ctenomys and their evolutionary implications, and highlight the importance of identifying the earliest fossils of both the total clade Ctenomyidae and the crown clade Ctenomys for the calibration of molecular phylogenies. We consider that Ctenomyidae is an ancient family with a temporally extended stem group that includes even middle Pleistocene species of the only surviving genus, Ctenomys. On the contrary, the strikingly diverse crown clade Ctenomys would have reached its unusually high current taxonomic and ecological diversification, as well as its widespread distribution, in a surprisingly short lapse.
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Acknowledgments
We are especially grateful to the editors, T Freitas, G Lopes Gonçalves, and R Maestri, for the invitation to contribute to this volume. For access to materials under their care, we thank P Teta, A Martinelli, M Ezcurra, L Chornogubsky (Museo Argentino de Ciencias Naturales, Argentina), P Ortiz, M Díaz (Facultad de Ciencias Naturales e Instituto Miguel Lillo, Argentina), S Bogan (Fundación de Historia Natural Azara, Argentina), M Pérez, E Ruigómez (Museo Paleontológico Egidio Feruglio), M Rosi (IADIZA, CONICET, Argentina), J Oliveira (Museu Nacional, Universidade Federal do Rio de Janeiro, Brasil), D Romero, M Taglioretti, F Scaglia, †A Dondas (Museo de Ciencias Naturales de Mar del Plata, Argentina), P Straccia (Museo de Ciencias Naturales de Santa Clara, Argentina), J Vargas Mattos (Colección Boliviana de Fauna, Bolivia), E Tonni, and M Reguero (Museo de La Plata, Argentina). This research was supported by Agencia Nacional de Promoción Científica y Tecnológica PICT 2016-2881.
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Verzi, D.H., De Santi, N.A., Olivares, A.I., Morgan, C.C., Álvarez, A. (2021). The History of Ctenomys in the Fossil Record: A Young Radiation of an Ancient Family. In: Freitas, T.R.O.d., Gonçalves, G.L., Maestri, R. (eds) Tuco-Tucos. Springer, Cham. https://doi.org/10.1007/978-3-030-61679-3_1
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