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Licensed Unlicensed Requires Authentication Published by De Gruyter January 13, 2017

Far away from the endemism area: first record of the Ecuador fish-eating rat Anotomys leander (Cricetidae: Sigmodontinae) in the Colombian Andes

  • David Marín-C EMAIL logo and Camilo Sánchez-Giraldo
From the journal Mammalia


Anotomys leander is an elusive rodent with the smallest known range among ichthyomyines, limited to only three localities in the Andes of Ecuador. Its last known record dates from 1980, and currently it is represented by a low number of specimens and localities, hampering knowledge about its geographic range. We provide the first Colombian record of A. leander, and its fourth known locality, based on an individual captured in Cajamarca, on the eastern slope of the Cordillera Central. The specimen exhibits all the diagnostic characteristics of the species, and it differs from Ecuadorean specimens in having a hypothenar pad and lacking a bacular cartilage. Our record extends the known range of the species 620 km northeastward, and increases the number of ichthyomyine species in Colombia to six. The assessment of its potential geographic range among areas in Ecuador and Colombia and the identification of its main threats in the latter are fundamental tasks to reassess the conservation status of this threatened Andean rodent.


We thank Juan Pablo Hurtado for capturing the Colombian specimen of Anotomys leander and for generously providing pictures of its capture site. Javier Colmenares and Elson Meneses (Universidad Industrial de Santander UIS) carried out the staining of the baculum of the specimen (CTUA 2556; Supplemental Figure 4), and Sonia Gómez and Elvira Aguilar (Servicios Ambiental y Geográficos SAG) provided the additional information of the habitat. We acknowledge Diego Tirira for confirming the locality data and geographic coordinates some of the Ecuadorean specimens, and Sergio Solari for facilitating the access to the Colección Teriológica Universidad de Antioquia (CTUA). Finally, we thank Sergio Solari and Hector Ramírez-Chaves for suggestions on the manuscript and improving its English version.


Alberico, M., A. Cadena, J. Hernández-Camacho and Y. Muñoz-Saba. 2000. Mamíferos (Synapsida: Theria) de Colombia. Biota Colombiana 1: 43–75.Search in Google Scholar

Barnett, A.A. 1997. The ecology and natural history of a fishing mouse Chibchanomys spec. Nov. (Ichthyomyini: Muridae) from the Andes of southern Ecuador. Mamm. Biol. 62: 43–52.Search in Google Scholar

Burneo S.F., J.F. González-Maya and D.G. Tirira. 2009. Distribution and habitat modelling for Colombian Weasel Mustela felipei in the Northern Andes. Small Carnivore Conservation 41: 41–45.Search in Google Scholar

Cuervo Díaz, A., J. Hernández Camacho and G.A. Cadena. 1986. Lista actualizada de los mamíferos de Colombia anotaciones sobre su distribución. Caldasia 15: 471–501.Search in Google Scholar

Dormann, C.F. 2007. Promising the future? Global change projections of species distributions. Basic Appl. Ecol. 8: 387–397.10.1016/j.baae.2006.11.001Search in Google Scholar

Gillespie, T.W., G.M. Foody, D. Rocchini, A.P. Giorgi and S. Saatchi. 2008. Measuring and modelling biodiversity from space. Prog. Phys. Geogr. 32: 203–221.10.1177/0309133308093606Search in Google Scholar

Hanson, J.D., G. D’Elía, S.B. Ayers, S.B. Cox, S.F. Burneo and T.E. Lee. 2015. A new species of fish-eating rat, genus Neusticomys (Sigmodontinae), from Ecuador. Zool. Stud. 54: 49.10.1186/s40555-015-0126-7Search in Google Scholar PubMed PubMed Central

Holdridge, L.R. 1964. Life Zone Ecology. Tropical Science Center, San José. pp. 206.Search in Google Scholar

IUCN. 2015. IUCN Red List of Threatened Species. Version 2015.4. International Union for Conservation of Nature. < Downloaded on 28 April 2016.Search in Google Scholar

Lee, T., S.F. Burneo, M.R. Marchán, S. Roussos and R.S. Vizcarra-Váscomez. 2008. The mammals of the temperate forests of Volcán Sumaco, Ecuador. Occas. Pap. Mus. Texas Tech Univ. 276: 1–9.Search in Google Scholar

Leite, R.N., M.N.F. Silva and T.A. Gardner. 2007. New records of Neusticomys oyapocki (Rodentia, Sigmodontinae) from a human-dominated forest landscape in northeastern brazilian Amazonia. Mastozool. Neotrop. 14: 257–261.Search in Google Scholar

Miranda, C.L., V. Rossi, T.B.F. Semedo and T.A. Flores. 2012. New records and geographic distribution extension of Neusticomys ferreirai and N. oyapocki (Rodentia, Sigmodontinae). Mammalia 76: 335–339.10.1515/mammalia-2011-0114Search in Google Scholar

Ochoa, J.G. and P. Soriano. 1991. A new species of water rat, genus Neusticomys Anthony, from the Andes of Venezuela. J. Mammal. 71: 97–103.10.2307/1381983Search in Google Scholar

Pacheco, V. and J. Ugarte-Núñez. 2011. New records of Stolzmann’s fish-eating rat Ichthyomys stolzmanni (Cricetidae, Sigmodontinae) in Peru: a rare species becoming a nuisance. Mamm. Biol. 76: 657–661.10.1016/j.mambio.2010.10.007Search in Google Scholar

Papeş, M. and P. Gaubert. 2007. Modelling ecological niches from low numbers of occurrences: Assessment of the conservation status of poorly known viverrids (Mammalia, Carnivora) across two continents. Divers. Distrib. 13: 890–902.10.1111/j.1472-4642.2007.00392.xSearch in Google Scholar

Patterson, B.D., S. Solari and P.M. Velazco. 2012. The role of the Andes in the diversification and biogeography of neotropical mammals. In: (B.D. Patterson and L.P. Costa, eds.) Bones, clones and biomes: the history and geography of recent Neotropical mammals. University of Chicago Press, Chicago, IL. pp. 351–378.10.7208/chicago/9780226649214.003.0015Search 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. 336.10.7208/chicago/9780226169606.001.0001Search in Google Scholar

Pearson, R.G., C.J. Raxworthy, M. Nakamura and A.T. Peterson. 2007. Predicting species distributions from small numbers of occurrence records: A test case using cryptic geckos in Madagascar. J. Biogeogr. 34: 102–117.10.1111/j.1365-2699.2006.01594.xSearch in Google Scholar

Percequillo, A.R., A.P. Carmignotto and M.J.D Silva. 2005. A new species of Neusticomys (Ichthyomyini, Sigmodontinae) from central Brazilian Amazonia. J. Mammal. 86: 873–880.10.1644/1545-1542(2005)86[873:ANSONI]2.0.CO;2Search in Google Scholar

Rocchini, D., J. Hortal, S. Lengyel, J.M. Lobo, A. Jimenez-Valverde, C. Ricotta, G. Bacaro and A. Chiarucci. 2011. Accounting for uncertainty when mapping species distributions: The need for maps of ignorance. Prog. Phys. Geogr. 35: 211–226.10.1177/0309133311399491Search in Google Scholar

Rodríguez, N., D. Armenteras, M. Morales and M. Romero. 2006. Ecosistemas de los Andes Colombianos. Segunda ed. Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Bogotá. pp 154.Search in Google Scholar

Rodríguez-Posada, M.E. 2014. Primer registro del ratón de agua del Táchira, Neusticomys mussoi (Rodentia, Cricetidae) en Colombia. Mastozool. Neotrop. 21: 367–372.Search in Google Scholar

Sánchez-Giraldo, C. and J.F. Díaz-Nieto. 2015. Dynamics of species composition of small non-volant mammals from the northern Cordillera Central of Colombia. Mammalia 79: 385–397.10.1515/mammalia-2014-0018Search in Google Scholar

Soberón, J. and A.T. Peterson. 2004. Biodiversity informatics: managing and applying primary biodiversity data. Philos. Trans. R. Soc. Lond. B. Biol. Sci. 359: 689–98.10.1098/rstb.2003.1439Search in Google Scholar PubMed

Solari, S., Y. Muñoz-Saba, J.V. Rodríguez-Mahecha, T.R. Defler, H.E. Ramírez-Chaves and F. Trujillo. 2013. Riqueza, endemismo y conservación de los mamíferos de Colombia. Mastozool. Neotrop. 20: 301–365.Search in Google Scholar

Thomas, O. 1906. A new aquatic genus of Muridae discovered by consul L. Soderstrom in Ecuador. Ann. Mag. Nat. Hist. 7: 86–88.10.1080/00222930608562492Search in Google Scholar

Tirira, D. and C. Boada. 2010. Anotomys leander. The IUCN Red List of Threatened Species 2010: e.T1564A4938565. Downloaded on 05 February 2016.10.2305/IUCN.UK.2010-2.RLTS.T1564A4938565.enSearch in Google Scholar

Velandia-Perilla, J.H. and C.A. Saavedra-Rodríguez. 2015. Mammalia, Rodentia, Cricetidae, Neusticomys monticolus (Anthony, 1921): Noteworthy records of the Montane fish-eating rat in Colombia. Check List 9: 686–688.10.15560/9.3.686Search in Google Scholar

Voss, R.S. 1988. Systematics and ecology of Ichthyomyine rodents (Muroidae): Patterns of morphological evolution in a small adaptative radiation. Bull. Am. Mus. Nat. Hist. 188: 259–493.Search in Google Scholar

Voss, R.S. 2003. A New Species of Thomasomys (Rodentia: Muridae) from eastern Ecuador, with remarks on mammalian diversity and biogeography in the Cordillera Oriental. Am. Mus. Novit. 3421: 1–47.10.1206/0003-0082(2003)421<0001:ANSOTR>2.0.CO;2Search in Google Scholar

Voss, R.S. 2015. Tribe Ichthyomyini Vorontsov, 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. 279–291.Search in Google Scholar

Supplemental Material:

The online version of this article (DOI: offers supplementary material.

Received: 2016-7-13
Accepted: 2016-11-8
Published Online: 2017-1-13
Published in Print: 2017-10-26

©2017 Walter de Gruyter GmbH, Berlin/Boston

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