Lagostomus crassus Thomas, 1910

Peruvian chinchilla (Vischaca)



Taxonomy & Nomenclature

Invalid (synonym of L. maximus) (Hadler et al., 2024)


Conservation Status

Invalid (synonym of L. maximus) (Hadler et al., 2024)

Last record: subfossil; 1910 (Fisher & Blomberg, 2012; Lee et al., 2017)

IUCN RedList status: Extinct





Biology & Ecology




Only known from a single skull (Lessa et al. 2008). According to (Thomas, 1920:220) it was found "in the sand at Santa Ana by Mr. Kalinowski."






Original scientific description:

Thomas, Oldfield. (1910). XXXIII.—A collection of mammals from eastern Buenos Ayres, with descriptions of related new mammals from other localities. The Annals and Magazine of Natural History 5(27): 239-247. [Abstract]


Other references:

Fisher, Diana O. and Blomberg, Simon P. (2012). Inferring Extinction of Mammals from Sighting Records, Threats, and Biological Traits. Conservation Biology 26(1): 57-67.

Hadler, Patricia, Galliari, Carlos A. and Pardiñas, Ulyses F. J. (2024). Chancy History of a Supposedly Vanished South American Rodent, Lagostomus crassus, with Remarks on Recent Extinctions in Caviomorphs, pp. 81-97. In: Rasia, Luciano Luis, Barbeito, Claudio Gustavo and Acuña, Francisco. (eds.). Plains Vizcachas: Biology and Evolution of a Peculiar Neotropical Caviomorph Rodent. Cham, Switzerland: Springer.

Lee, T. E., Fisher, D. O., Blomberg, S. P. and Wintle, B. A. (2017). Extinct or still out there? Disentangling influences on extinction and rediscovery helps to clarify the fate of species on the edge. Global Change Biology 23(2): 621-634.

Lessa, E., Ojeda, R. and Bidau, C. (2008). Lagostomus crassus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. ( Downloaded on 26 December 2012.

Roach, N. (2016). Lagostomus crassus. The IUCN Red List of Threatened Species 2016: e.T136452A78324250. Accessed on 14 June 2022.

Spotorno, A. E. and Patton, J. L. (2015). Superfamily Chinchilloidea Bennett, 1833. In: Patton, J.L., Pardinas, U.F.J. and D'Elia, G. (eds), Mammals of South America Volume 2: Rodents, pp. 762-778. University of Chicago Press.

Spotorno AE, Valladares Faúndez P (2016) Family Chinchillidae (Viscachas and Chinchillas). In: Lacher TE, Mittermeier RA, Wilson DE (eds) Handbook of the mammals of the world, Lagomorphs and rodents I, vol 6. Lynx Edicions, Barcelonap, pp. 462-481.

Thomas, Oldfield. (1920). Report on the mammalia collected by Mr. Edmund Heller during the Peruvian expedition of 1915 under the auspices of Yale University and the National Geographic Society. Proceedings U. S. National Museum 58: 217-249 + pl. 15.

Turvey, Samuel T. (2009). Holocene mammal extinctions, pp. 41-61. In: Turvey, Samuel T. (ed.). Holocene Extinctions. Oxford, UK & New York, USA: Oxford University Press. xii + 352 pp.

Turvey, Samuel T. and Fritz, Susanne A. (2011). The ghosts of mammals past: biological and geographical patterns of global mammalian extinction across the Holocene. Philosophical Transactions of the Royal Society B: Biological Sciences 366(1577): 2564-2576. [Supplementary Information]

Wilson, D. E. and Reeder, D. M. (2005). Mammal species of the world: a taxonomic and geographic reference. Third edition. Baltimore, MD: John Hopkins University Press.


<< Back to the Rodents database