The following is the list of mammals which have been taxonomically described in the 21st century.
Living higher taxa Name Order Author Year Distribution Reference Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001 Luo, Z.-X., Cifelli, R.L. & Kielan-Jaworowska, Z. 2001. Dual origins of tribosphenic mammals. Nature 409:53–57. Neoceti Cetacea Fordyce & de Muizon 2001 Fordyce, R.C. & de Muizon, C. 2001. Evolutionary history of the cetaceans: a review. Secondary Adaptations of Tetrapods to Life in the Water 169–233. Platanistida Fordyce & de Muizon 2001 Fordyce, R.C. & de Muizon, C. 2001. Evolutionary history of the cetaceans: a review. Secondary Adaptations of Tetrapods to Life in the Water 169–233. Baiomyini Rodentia Musser & Carleton 2005 Musser G. G, Carleton M. D. 2005. Superfamily Muroidea. Pp. 894–1531 in Mammal species of the world: a taxonomic and geographic reference (Wilson D. E., Reeder D. M., eds.). 3rd ed. Johns Hopkins University Press, Baltimore, Maryland. Ochrotomyini Rodentia Musser & Carleton 2005 Musser G. G, Carleton M. D. 2005. Superfamily Muroidea. Pp. 894–1531 in Mammal species of the world: a taxonomic and geographic reference (Wilson D. E., Reeder D. M., eds.). 3rd ed. Johns Hopkins University Press, Baltimore, Maryland. Abrotrichini Rodentia D'Elía, Pardiñas, Teta & Patton 2007 Argentina, Bolivia, Chile, Peru Apodemini Rodentia Lecompte, Aplin, Denys, Catzeflis, Chades & Chevret 2008 Arvicanthini Rodentia Lecompte, Aplin, Denys, Catzeflis, Chades & Chevret 2008 Malacomyini Rodentia Lecompte, Aplin, Denys, Catzeflis, Chades & Chevret 2008 Millardini Rodentia Lecompte, Aplin, Denys, Catzeflis, Chades & Chevret 2008 Praomyini Rodentia Lecompte, Aplin, Denys, Catzeflis, Chades & Chevret 2008 Cistugidae Chiroptera Lack, Roehrs, Stanley, Ruedi & Van Den Bussche 2010 Stenonycterini Chiroptera Nesi, Kadjo, Pourrut, Leroy, Pongombo, Shongo, Cruaud & Hassanin 2012 Hsunycterini Chiroptera Parlos, Timm, Zwier, Zeballos & Baker 2014 Euneomyini Rodentia Pardiñas, Teta & Salazar-Bravo 2015 Peru, Chile, Argentina Setonichini Diprotodontia Jackson & Groves 2015 Australia Eidolinae Chiroptera Almeida, Giannini & Simmons 2016
Living genera Name Order Author Year Distribution Reference Juliomys Rodentia González 2000 Argentina (Misiones), Brazil (Espirito Santo, Minas Gerais, Parana, Rio de Janeiro, Santa Catarina, São Paulo) González, E.M. 2000. Un nuevo genero do roedor sigmodontino de Argentina y Brazil (Mammalia: Rodentia: Sigmodontinae). Comunicaciones Zoologicas del Museo de Historia Natural de Montevideo 12:1–12. Pipanacoctomys Rodentia Mares, Braun, Barquez & Diaz 2000 Argentina (Catamarca) Mares, M. A., Braun, J.K., Bárquez, R.M., & Díaz, M.M. Two new genera and species of halophytic desert mammals from isolated salt flats in Argentina. Occasional Papers, Museum of Texas Tech University, 203:1–27. Salinoctomys Rodentia Mares, Braun, Barquez & Diaz 2000 Argentina (La Rioja) Mares, M. A., Braun, J.K., Barquez, R.M., & Diaz, M.M. Two new genera and species of halophytic desert mammals from isolated salt flats in Argentina. Occasional Papers, Museum of Texas Tech University, 203:1–27. Tapecomys Rodentia Anderson & Yates 2000 Bolivia Anderson, S. & Yates, T.L. 2000 A new genus and species of phyllotine rodent from Bolivia. Journal of Mammalogy 81(1):18–36. Hyladelphys Didelphimorphia Voss, Lunde & Simmons 2001 Brazil, French Guiana, Guyana, Peru Voss, R.S., Lunde, D.P. & Simmons, N.B. 2001. Mammals of Paracou, French Guiana: a Neotropical lowland rainforest fauna. Part 2. Nonvolant species. Bulletin of the American Museum of Natural History 263:1–236. Handleyomys Rodentia Voss, Gómez-Laverde & Pacheco 2002 Voss, R.S., Gomez-Laverde, M. & Pacheco, V. 2002. A New Genus for Aepeomys fuscatus Allen, 1912, and Oryzomys intectus Thomas, 1921: Enigmatic Murid Rodents from Andean Cloud Forests. American Museum Novitates 3373:1–42. Sommeromys Rodentia Musser & Durden 2002 Musser, G.G. & Durden, L.A. 2002. Sulawesi rodents: description of a new species of Murinae (Muridae, Rodentia) and its parasitic new species of sucking louse (Insecta, Anoplura). American Museum Novitates 3368:1–50. Chacodelphys Didelphimorphia Voss, Gardner & Jansa 2004 Voss, R.S., Gardner, A.L. & Jansa, S.A. 2002. On the Relationships of "Marmosa" formosa Shamel, 1930 (Marsupialia: Didelphidae), a Phylogenetic Puzzle from the Chaco of Northern Argentina. American Museum Novitates 3442:1–18. Drymoreomys Rodentia Percequillo, Weksler & Costa 2011 Brazil (Santa Catarina, São Paulo) Paynomys Rodentia Teta, Cañon, Patterson & Pardiñas 2016 Petrosaltator Macroscelidea Dumbacher & Rathbun 2016 Pseudoromicia Chiroptera Monadjem, Patterson, Webala & Demos 2020 Afronycteris Chiroptera Monadjem, Patterson, & Demos 2020
Living subgenera Name Order Author Year Distribution Reference Cryptomustela Carnivora Abramov 2000 Abramov, A.V. 2000. A taxonomic review of the genus Mustela (Mammalia, Carnivora). Zoosystematica Rossica 8(2):357–364. Vocalomys Rodentia Golenishchev & Malikov 2006 Afropipistrellus Chiroptera Thorn, Kock & Cuisin 2007 Thorn, E., Kock, D. & Cuisin, J. 2007. Status of the African bats Vesperugo grandidieri Dobson, 1876 and Vesperugo flavescens Seabra, 1900 (Chiroptera, Vespertilionidae), with description of a new subgenus. Mammalia 71(1–2):70–79. Hyrcanicola Rodentia Nadachowski 2007 Azerbaijan, Iran Nadachowski, A. 2007. The taxonomic status of Schelkovnikov's Pine Vole Microtus schelkovnikovi (Rodentia, Mammalia). Acta zoologica cracoviensia 50A(1–2):67–72. Leuconycteris Chiroptera Porter, Hoofer, Cline, Hoffmann & Baker 2007 Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Venezuela Porter, C.A., Hoofer, S.R., Cline, C.A., Hoffmann, F.G. & Baker, R.J. 2007. Molecular phylogenetics of the phyllostomid bat genus Micronycteris with descriptions of two new subgenera. Journal of Mammalogy 88(5):1205–1215. Schizonycteris Chiroptera Porter, Hoofer, Cline, Hoffmann & Baker 2007 Central and South America Porter, C.A., Hoofer, S.R., Cline, C.A., Hoffmann, F.G. & Baker, R.J. 2007. Molecular phylogenetics of the phyllostomid bat genus Micronycteris with descriptions of two new subgenera. Journal of Mammalogy 88(5):1205–1215. Megapomys Rodentia Heaney, Balete, Rickart, Alviola, M.R.M.Duya, M.V.Duya, Veluz, VandeVrede & Steppan 2011 Philippines (Luzon) Heaney, L.R., Balete, D.S., Rickart, E.A., Alviola, P.A., Duya, M.R.M., Duya, M.V., Veluz, M.J., VandeVrede, L. & Steppan, S.J. 2011. Chapter 1: Seven New Species and a New Subgenus of Forest Mice (Rodentia: Muridae: Apomys) from Luzon Island. Fieldiana Life and Earth Sciences 2:1–60. Eomarmosa Didelphimorphia Voss, Gutiérrez, Solari, Rossi & Jansa 2014 Exulomarmosa Didelphimorphia Voss, Gutiérrez, Solari, Rossi & Jansa 2014 Ozimops Chiroptera Reardon, McKenzie, Cooper, Appleton, Carthew & Adams 2014 Setirostris Chiroptera Reardon, McKenzie, Cooper, Appleton, Carthew & Adams 2014 Angelomys Rodentia Teta, Cañon, Patterson & Pardiñas 2016 Pegamys Rodentia Teta, Cañon, Patterson & Pardiñas 2016 Sciophanes Didelphimorphia Díaz-Nieto, Jansa & Voss 2016
Living species