Abstract
The generic placement and tribal affiliation of Wiedomys marplatensis Quintana, 2002 are revised based on the study of its holotype and a single known remains from San Andrés Formation (Early Pleistocene; Buenos Aires Province, Argentina). The anatomical traits selected as indicators belonging to Wiedomys Hershkovitz, 1959 are interpreted here as general similarities. Wiedomys marplatensis is removed from Wiedomys and is considered as a junior synonym of Cholomys pearsoni Reig, 1980. The affiliation of the latter to Wiedomyini is discussed and the alternative hypothesis to allocate Cholomys Reig, 1980 in Oryzomyini is advanced. Although further research and more fossils are necessary to solve this issue, the placement of Cholomys as Sigmodontinae incertae sedis and the avoidance of using it as a point of calibration in molecular phylogenies are suggested.
Acknowledgments
We studied the discussed fossils along many years and visits to MACN and MMP repositories; we are indebted for hospitality and free access to the curators A. Ramos and A. Kramarz (MACN) and A. Dondas, T. Scaglia, L. Scaglia and M. Taglioretti (MMP). Loans of Wiedomys were kindly authorized by J. Oliveira, curator of Museu Nacional (Rio de Janeiro, Brasil); C. Cañón helped us with photographs of Wiedomys recently obtained in the MN. Funds for this research are those of PICT (Agencia) 2014-1039 (to UFJP). We want to express our gratitude to the above-mentioned persons and institutions and also to the associate editor F. Catzeflis and the two anonymous reviewers that largely improved the manuscript. This is GEMA (Grupo de Estudios de Mamíferos Australes) contribution #20.
Appendices
Appendix 1: Specimens studied in this contribution belong to the following collections: Colección de Mamíferos del Centro Nacional Patagónico (CNP; Chubut, Argentina); Colección de Material de Egagrópilas y Afines “Elio Massoia,” Centro Nacional Patagónico (CNP-E; Chubut, Argentina); Colección Nacional de Paleontología Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (MACN; Buenos Aires, Argentina); Museo Municipal de Ciencias Naturales y Tradicional de Mar del Plata “Lorenzo Scaglia” (MMP-M; Mar del Plata, Buenos Aires, Argentina); Museu Nacional (MN; Rio de Janeiro, Brasil).
Cholomys pearsoni.– MMP M-869 (holotype), incomplete right lower jaw; Baliza San Andrés, Buenos Aires, Argentina, Vorohué Formation.
Wiedomys marplatensis.– MACN 19697 (holotype), incomplete left lower jaw; Playa Santa Isabel, Buenos Aires, Argentina, San Andrés Formation.
Wiedomyspyrrhorhinos. – CNP 3643, CNP 4728, Sítio Marimbondo, Caruaru, Pernambuco, Brasil; MN 68601, Riacho da Ressaca, Piripá, Bahia, Brasil; MN 71607, MN 71608, Parque Nacional da Chapada Diamantina, Salinas, Morro do Chapéu, Bahia, Brasil; MN 73419, Berilo, Minas Gerais, Brasil; MN 73520, Usina Hidroelétrica Irapé, Berilo, Minas Gerais, Brasil.
Wilfredomys oenax.– CNP 2378, CNP 2379, Cerro Colorado, Soriano, Uruguay.
Appendix 2: Revised suprageneric framework, geographical and chronological distribution for the cricetid rodents discussed in this paper.
Order Rodentia
Family Cricetidae
Subfamily Sigmodontinae
Sigmodontinae incertae sedis
Genus Cholomys Reig, 1980
Cholomys pearsoni Reig, 1980
Cholomys pearsoni Reig, 1980: 266; holotype: MMP M-869, incomplete right lower jaw with incisor and m1-3.
Wiedomys marplatensis Quintana, 2002: 271; holotype: MACN 19697, incomplete left lower jaw with m2-3.
Geographical distribution: Atlantic slopes near Mar del Plata, Buenos Aires Province, Argentina.
Stratigraphical and chronological distribution: Vorohué and San Andrés Formations; Late Pliocene-Early Pleistocene.
Tribe Wiedomyini Reig, 1980
Type genus: Wiedomys Hershkovitz, 1959 (by original designation).
Included genera (arranged in alphabetic order): Phaenomys Thomas, 1917, Wiedomys Hershkovitz, 1959 and Wilfredomys Avila-Pires, 1960.
Geographical distribution: Eastern Brazil and northern Uruguay.
Chronological distribution: Late Pleistocene-Holocene (for Wiedomys in Brazil)-Recent.
References
Barbière, F., P.E. Ortiz, and U.F.J. Pardiñas. 2016. Evolución de los roedores Cricetidae en América del Sur: una visión desde el registro paleontológico. In: (F. Agnolin, G. Lio, F. Brissón-Egli, N. Chimento, and F. Novas, eds.) Historia evolutiva y paleobiogeográfica de los vertebrados de América del Sur. Contribuciones Científicas del Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” 6, Buenos Aires. pp. 335–346.Search in Google Scholar
Bonvicino, C. 2015. Genus Wiedomys Hershkovitz, 1959. In: (J.L. Patton, U.F.J. Pardiñas, and G. D’Elia, eds.) Mammals of South America, Volume 2: Rodents. University of Chicago Press, Chicago, IL. pp. 683–685.Search in Google Scholar
Braun, J.K. 1993. Systematic relationships of the tribe Phyllotini (Muridae: Sigmodontinae) of South America. Sam Noble Oklahoma Museum of Natural History, University of Oklahoma, Special Publication. pp. 50.Search in Google Scholar
Cione, A.L., G.M. Gasparini, E. Soibelzon, L.H. Soibelzon, and E.P. Tonni. 2015. The Great American Biotic Interchange. A South American perspective. Springer Briefs in Earth System Sciences, South America and the Southern Hemisphere, Springer, Berlin. pp. 97.Search in Google Scholar
Freudenthal, M., M. Hugueney, and E. Moissenet. 1994. The genus Pseudocricetodon (Cricetidae, Mammalia) in the Upper Oligocene of the province of Teruel (Spain). Scripta Geol. 104: 57–114.Search in Google Scholar
Gonçalves, P.R., F.C. Almeida, and C.R. Bonvicino. 2005. A new species of Wiedomys (Rodentia: Sigmodontinae) from Brazilian Cerrado. Mamm. Biol. 70: 46–60.10.1078/1616-5047-00175Search in Google Scholar
Hershkovitz, P. 1959. Two new genera of South American rodents (Cricetinae). Pro. Biol. Soc. Washington 72: 5–9.Search in Google Scholar
Hershkovitz, P. 1962. Evolution of Neotropical cricetine rodents (Muridae) with special reference to the Phyllotine Group. Fieldiana, Zool. 46: 1–524.10.5962/bhl.title.2781Search in Google Scholar
Hershkovitz, P. 1993. A new Central Brazilian genus and species of sigmodontine rodent (Sigmodontinae) transitional between akodonts and oryzomyines, with a discussion of muroid molar morphology and evolution. Fieldiana, Zool., n. s. 75: 1–18.10.5962/bhl.title.3370Search in Google Scholar
Leite, L.R., S.O. Kolokotronis, F.C. Almeida, F.P. Werneck, D.S. Rogers, and M. Weksler. 2014. In the wake of invasion: Tracing the historical biogeography of the South American cricetid radiation (Rodentia, Sigmodontinae). PLoS One 9: e100687.10.1371/journal.pone.0100687Search in Google Scholar PubMed PubMed Central
Luna, L. and B.D. Patterson. 2003. A remarkable new mouse (Muridae: Sigmodontinae) from southeastern Peru: with comments on the affinities of Rhagomysrufescens (Thomas, 1886). Fieldiana, Zool., n. s. 101: 1–24.10.5962/bhl.title.3529Search in Google Scholar
Machado, L.F., M.H. Passaia, F.P. Rodrigues, F.B. Peters, J. Sponchiado, V.H. Valiati, and A.U. Christoff. 2015. Molecular phylogenetic position of endangered Wilfredomys within Sigmodontinae (Cricetidae) based on mitochondrial and nuclear DNA sequences and comments on Wiedomyini. Zootaxa 3986: 421–434.10.11646/zootaxa.3986.4.2Search in Google Scholar PubMed
Oliveira, J.A. and G. Lessa. 1999. Análise preliminar da fauna de roedores murídeos (Mammalia, Sigmodontinae) pleistoceno-holocênicos das grutas calcárias do Nordeste da Bahia. In: (D. de A. Campos, A.W.A. Kellner, R. Iannuzzi, and N. Sierra-Ramírez, eds.) Congresso Brasileiro de Paleontologia 16. Crato. p. 81.Search in Google Scholar
Pacheco, V. 2003. Phylogenetic analyses of the Thomasomyini (Muroidea: Sigmodontinae) based on morphological data. Doctoral thesis, The City University of New York, NY, USA.Search in Google Scholar
Parada A., G. D’Elía, and E. Palma. 2015. The influence of ecological and geographical context in the radiation of Neotropical sigmodontine rodents. BMC Evol. Biol. 15: 172.10.1186/s12862-015-0440-zSearch in Google Scholar PubMed PubMed Central
Pardiñas, U.F.J., G. D’Elía, and P.E. Ortiz. 2002. Sigmodontinos fósiles (Rodentia, Muroidea, Sigmodontinae) de América del Sur: estado actual de su conocimiento y prospectiva. Mast. Neotrop. 9: 209–252.Search in Google Scholar
Pardiñas, U.F.J., P. Teta, and G. D’Elía. 2009. Taxonomy and distribution of Abrawayaomys (Rodentia: Cricetidae), an Atlantic Forest endemic with the description of a new species. Zootaxa 2128: 39–60.10.11646/zootaxa.2128.1.2Search in Google Scholar
Pardiñas, U.F.J., G. D’Elía, G. Lessa, M. Passamani, and P. Teta. 2014a. Nuevos datos morfológicos y una hipótesis filogenética para Phaenomys (Rodentia, Cricetidae). Mast. Neotrop. 21: 251–261.Search in Google Scholar
Pardiñas, U.F.J., G. Lessa, P. Teta, J. Salazar-Bravo, and M.V.C. Câmara. 2014b. A new genus of sigmodontine rodent from eastern Brazil and the origin of the tribe Phyllotini. J. Mamm. 95: 201–215.10.1644/13-MAMM-A-208Search in Google Scholar
Patton, J.L., U.F.J. Pardiñas, and G. D’Elia. 2015. Mammals of South America, Volume 2: Rodents. University of Chicago Press, Chicago, IL. pp. 1384.10.7208/chicago/9780226169606.001.0001Search in Google Scholar
Quintana, C.A. 2002. Roedores cricétidos del Sanandresense (Plioceno tardío) de la provincia de Buenos Aires. Mast. Neotrop. 9: 263–275.Search in Google Scholar
Reig, O.A. 1972. The evolutionary history of South American cricetids rodents. Doctoral thesis, College University, London.Search in Google Scholar
Reig, O.A. 1977. A proposed unified nomenclature for the enameled components of the molar teeth of the Cricetidae (Rodentia). J. Zool., London 181: 227–241.10.1111/j.1469-7998.1977.tb03238.xSearch in Google Scholar
Reig, O.A. 1980. A new fossil genus of South American cricetid rodents allied to Wiedomys, with an assessment of the Sigmodontinae. J. Zool., London 192: 257–281.10.1111/j.1469-7998.1980.tb04233.xSearch in Google Scholar
Teta, P. 2013. Relaciones filogenéticas de la tribu Abrotrichini (Rodentia, Cricetidae): análisis separados y combinados de evidencias morfológicas y moleculares. Doctoral thesis, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata, Buenos Aires.Search in Google Scholar
Voss, R.S., and P. Myers. 1991. Pseudoryzomys simplex (Rodentia: Muridae) and the significance of Lund’s collections from the caves of Lagoa Santa, Brazil. Bull. Amer. Mus. Nat. Hist. 206: 414–432.Search in Google Scholar
Wied-Neuwied, M. P. 1821. Reise nach Brasilien in den Jahren; 1815 bis 1817. Heinrich Ludwig Brönner, Frankfurt a. M. pp. 345.Search in Google Scholar
Weksler, M. 2006. Phylogenetic relationships of oryzomine [sic] rodents (Muroidea: Sigmodontinae): separate and combined analyses of morphological and molecular data. Bull. Amer. Mus. Nat. Hist. 296: 1–149.10.1206/0003-0090(2006)296[0001:PROORM]2.0.CO;2Search in Google Scholar
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